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Catfish fishery in Zimbabwe 11/13/09
Bob,
There's an interesting message in the FW in box about a catfish fishery
in Zimbabwe. I'm not really sure how to answer this question; what would
work for an aquarium might not be relevant where health and safety, food
production, and environmental management issues are at stake. Would you
want to handle that question? Is there a better website or form for
aquaculture questions to be fielded?
Cheers, Neale
<Mmm, will take a look. BobF>
Catfish hatchery 11/13/09
Hi WetWeb Crew
<Yasfir>
How is every one doing? Well i hope? I have a rather interesting
conundrum for you this week. lets start off with a bit of background.
I live in Zimbabwe which as you know is not the richest of countries.
<Mmm, yes... am decidedly an anti-fan of Mugabe>
My story starts like this I would like to start a catfish hatchery in
the northern part of the country in a place called Chirundu, I would
like it to be a small to medium scale hatchery. breeding Clarias
gariepinus or the African sharptooth catfish. I have done extensive
research on the means and the methods and have done some experimenting
and I have successfully have produced fry. which is have the battle won,
my problem comes however in the actual design of the hatchery itself, I
have see some guidelines in some papers I've read and have come up with
a few drawings (see attachments)
<Nothing attached here>
but these are the drawing of the holding units for single catfish and
for eggs and fry. The water we are using comes straight out of the
Zambezi river and is full of silt,
<This will likely have to be simply treated, the sediment taken out, and
any predators screened out as well, before use>
i haven't been able to monitor any other parameters such as nitrates,
nitrites and ph. but i would like to put a sump system in place before
water reaches any of the holding tanks.
<A very good idea>
After water has
circulated through the system once it can either return to the river or
reenter the sump system. What do you think?
<I would try to arrange all this w/ a minimum of pumping if you could.
If there are no enforced laws re returning the water to the river, I
would do this... via gravity if at all practical>
i would also like the fry holding tanks to run on a separate sump system
with maybe added uv filtration to kill any pathogens in the water?
<Mmm, if the cost isn't too much. My experience with the congener
Clarias batrachus, makes me think that the young should be very tough>
again im not sure of my self here. Chirundu is hot at all times of the
year,
<Yes... my roommate of many years, has visited there. I've asked him re>
although there maybe cold snaps during winter. Heat during summer maybe
a problem how would i go about building a housing facility for my
hatchery that stays cool in summer and warm in winter?
<As this fish is native, I would not be so concerned... other than using
shading, keeping the water moving, I think you'll be fine>
I would appreciated any and all help you could give me.
Cheers Yasi
<I take it, or want to encourage you to think re other aspects/issues,
like foods, how you'll process and market this catfish product. Have you
"done a spreadsheet" for costs, revenue for this project? If so, please
send a draft along and I will gladly take a look over it. Bob Fenner,
whose academic background is actually fisheries biology>
Re: Catfish hatchery 11/15/09
hi
<Hello again Yasfir>
Thanks for the feed back, it was helpful. i now need help setting up the
sump as i have the vaguest idea of how to do this. If you could show me
a diagram of one that would meet my needs.
<Mmm, unfortunately I don't know where one is to reference, but
basically this is a large basin/container, with sloping bottom, with a
mechanism (a simple drain or even just a removable standpipe), where new
water (after it has been screened to omit/leave out undesirable life...
predators) can pass through, possibly with mechanical media (brushes,
most anything not too fine) to "drop out" particulates, before being
further processed. Here one MUST pay attention to costs. Water will need
to be available continuously, but you don't want to suffer
electrical/pumping expense any more than necessary>
i would set my sump up for basically biological and mechanical
filtration.
<Yes>
im looking at the formulation of feeds for the larvae, juveniles and
adults.
<Good... see what others are feeding this species, that results in good
growth, is locally available and inexpensive>
i will
also have a cost sheet available by the end of the week.
cheers
Yasi
<And you, Bob Fenner>
Find out wholesale prices, Re: selling lvstk. to LFSs
12/30/08 Hi there! I've recently set up a tank of fancy guppies
and they roll out a plethora of babies. The pet stores sell the adult fish for
$2-3, so I think hmm...maybe I could start selling some to a local pet store
every couple weeks to help pay off the cost of this hobby ;). <A good idea
and a worthy project for sure... Providing better, local stock, reducing
imports> The problem is, I can't view what wholesale prices are at any
wholesale supplier websites I can find- evidently I must be a "business" to do
this. Is there any way to view the prices local aquariums buy these fish for so
I could know a fair price to offer per fish? Thanks, Nick <Mmm, it's
likely better here for me to "cut to the chase" and make a statement re the
"usual" sort of mark up for small (a dollar, more/less) aquatic livestock...
It's generally marked up about 2-3 times... Triple crowning for somethings like
guppies... so, If a store had them on offer for $3, they likely paid about $1...
That being said, you might well do better to bargain for credit with the store
in exchange for your stock... Something more like "half credit" toward what
they sell them for. Does this make sense to you? Bob Fenner>
Re: Find out wholesale prices 12/30/08 Dear Bob Fenner,
<Yes Nick> Thanks- makes great sense! Really all I needed was a ballpark
estimate to know how much to offer.
-Nick <Ahh! Figured as much... Keep breeding!!! BobF>
Swim Bladder in one day.. I think... Cichlid, Neotrop., Texas... env.
dis. 12/17/08 Hi I am begging for help. <No need to beg;
we're happy to help!> I have a 4 yr old Texas. <Texas cichlid, I presume?>
She had babies about 8 months ago. She has killed the convict father, and tended
to the babies herself. <She cross-bred with a Convict cichlid? Never heard of
that before. Hope you didn't sell/give away the fry. Hybrid fish are a blight on
the hobby, and while fine enough as your own pets, it's very unfair for a
retailer to sell them to unsuspecting fishkeepers.> She started not eating
about two weeks ago, and stayed away from them. <Broodcare in most cichlids
does indeed weaken after a few weeks, though this varies.> A few picked on
her, but she ran them away. I try to clean the tank a lot, due to messy babies.
It has never been a problem.
<It's almost always best to remove cichlid fry 2-3 weeks after hatching to their
own tank for separate rearing. Because fry are very sensitive to water quality,
they often stunt or otherwise do poorly when kept with the adults.> I
unfortunately let the water level get low. After doing a partial clean, and
refill, today I go see them, and she is swimming at the top, in a horrible U
shape, Head down, and taking gasping air. <Almost certainly a reaction to a
sudden change in water quality, water chemistry, or temperature. Texas cichlids
need hard (10+ degrees dH), basic (pH 7.5) water around 25 C (77 F). If the pH
had dropped between water changes, in particular because of insufficient
carbonate hardness, then doing a big water change could have switched the pH
from something acidic to something basic, putting a massive (and potentially
lethal) stress on your cichlid. The only other thing that would do something
similar is the introduction of some toxin; specifically, if the bucket had
residues for something like bleach or detergent, that can cause severe reactions
in your fish.> I moved her to small tank, fresh water, and Epsom salt. She
doesn't swim anymore, unless disturbed, but still in a U shape, moving her fins
rapidly but wont swim straight. <Moving fish in shock is rarely a good idea;
much better to leave them to recover from the first shock rather than impose a
second one on them.> I really don't want to lose my girl, I have always taken
care of her the best I could. She is about 8" and healthy(i hope) the tank she
was in is a 55gl, she has about 30 babies (still under 3in small) some smaller.
<Please don't give away or sell those hybrid fry. It's one of the most
irresponsible things any aquarist can do. If you can't house them yourself, then
painlessly destroy them. I don't say this to be mean, but because of the "big
picture" that sometimes gets lost when people get attached to animals as
individuals.> Her new hospital tank is a ten gal, and Epsom salt with 82*
water. How long should she take to heal, she wont eat anything, so i am
really scared. <If she's going to recover from shock, then it may well take a
couple of days before she's swimming right, and maybe even a week before she's
ready to act normally around you and feed. Cichlids are among those fish that
react badly to sudden changes. If the problem was poisoning, then performing
repeated water changes to flush out toxins would help, but obviously the
incoming water MUST have identical water chemistry and temperature to the
outgoing water. I don't normally recommend freshwater aquarists use carbon for a
variety of reasons, but if you suspect poisoning, then this is one those few
situations where fresh carbon makes sense. As you know hopefully, carbon needs
replacing every couple of weeks, so any old carbon in your filter will be doing
precisely nothing useful.> Please help me..I love this fish <Good luck,
Neale.>
Re: Swim Bladder in one day..I think... (Euthanising hybrids, why
it's necessary; RMF, feel free to comment) I must first say Thank
you for the help you gave me. I now think that could have been what happened.
She is still in the same condition as before, but now the color is much
brighter, and she look a bit more relax, Thank for all your help. <Glad to
hear it.> NOW, Yes the Texas and the Convict did mate, they were the only
ones in the tank, for that four months. So yes these are hybrid babies. <Oh
dear.> But really, you would purposely destroy (kill) a fish, that had no
choice in what they were born from. <Yes. But before you condemn me for it,
think logically for a moment. Single species fish are predictable in terms
of size, temperament, breeding behaviour, likelihood of genetic diseases and
abnormal growth patterns. Hybrids are none of these things Hybrids may be
fine as youngsters, but they may be pre-disposed to problems as they mature, may
exhibit reduced fertility, or may behave in aberrant ways compared with one or
both of their parents.. By passing hybrids on to other aquarists, you also
increase the chances of genes from species A getting into fish sold as species
B. Someone buys species B, and then find it isn't doing any of the things it
should be doing. It doesn't look like it should, and it's the wrong size, it
can't breed normally. In many cases species cultivated by aquarists come from
very specific places. This is common among the cichlid varieties from the Rift
Valley lakes and Central America. These varieties are particular colour forms of
species with distinctive genes. When "mixed" in aquaria that genetic uniqueness
is lost. Is that a big deal? Yes, if you're a collector. But it's incredibly
important if you're a scientist. Some of these varieties are endangered in the
wild, a few even extinct. They only exist in captivity. Hybrids put additional
stress on wild populations of fish as well. Sensible fishkeepers don't want to
keep hybrids because of the problems mentioned above. Because so many hybrids
are in pet stores, any serious fishkeepers demands wild-caught examples of many
species prone to hybridisation. This means that instead of the trade building up
supplies of captive-bred cichlids, there's still a huge industry collecting
wild-caught fish, in some cases having a very real impact on the populations of
wild fish. When aquarists allow them to hybridise or cross-breed, they're
reducing the chances of keeping that species or variety from extinction. In
every possible way, hybrids are bad. Hybrids are unpredictable, they're prone to
problems, they make it impossible to set up balanced communities, and they
increase the chances of wild fish going extinct. Hence as a broad comment,
hybridisations is something aquarists should actively try to avoid. I'm an
animal lover. I spend an hour or more per day volunteering at this web site to
help people save the lives of their fish and reptiles. But I'm also a scientist
and try to see the big picture.> I have read this type of article before, it
had something to do , with breeders, losing money, Many fish from breeders are
new breeds, cross bred, and a new species is born. Flowerhorn, is one to start
with. <And pretty awful it is too. Nature has managed to come up with around
2000 cichlid species by herself, each one finely adapted to the environment it
finds itself. There are plenty of different colours and behaviours, more than
enough for everyone. And yet breeders in Asia thought they could out-do Nature
and come up with something themselves. I suppose it's a question of taste, but
to me the Flowerhorn is the fish equivalent of Pamela Anderson: silicone
breasts, nose jobs, peroxide-blonde hair and tattoos all over the place. May be
Hefner's thing, but certainly not mine.
I'd sooner take the cichlids Nature has created, and do my best to learn
about these wonderful fish on their own terms.> As far a fish stores, telling
me they have no way of selling hybrids, people don't like them, so they wouldn't
purchase them from me, but they would be willing to just take them off my hands
for free. K-M-A... I was born in '69 not '99. <I'm assuming "KMA" is an
insult. Fine. You may indeed keep your hybrid cichlids from breeding. But what
about the other people? How long before they cross them with some other Convicts
or Texas cichlids. And then, before you know it, there are messed up genes all
over the place. And I'm here, having to answer questions from a person keeping
what he or she thought was a Convict, but it's the wrong size, behaving in the
wrong way, or getting deformed or sick for no apparent reason. What you're doing
is selfish and irresponsible. You're doing what you think is acceptable by your
personal standards, without considering the repercussions for everyone else,
including the fish.> These are some of the most beautiful fish ever. They are
big and colorful like the Texas, with black stripes like the convict..You can
you tube some..but i haven't seen any as nice as these.. I am not a hobbyist, I
just happen to have two fish, that had fry, so should I kill the fry, because of
nature taking it's course? <Yes.> As a professional as you proclaim to be,
I would think you would have some heart for the fish, that you spend much of
your time learning, shame on you. <Why shame on me? My love for animals and
for the hobby doesn't need your justification. I'm the guy spending an hour each
day helping people. I think my wish to help animals have better lives is
perfectly obvious. That I'm a scientist and fishkeeping writer as well simply
means I'm looking at the situation from a wider angle than you are.> I would
never kill anything, maybe you are someone that doesn't believe in mixed races
also..what a shame. <Am mixed race, so your comment here is insulting as well
as irrelevant. Humans are all one species, and certainly not one in any
danger of extinction. Convicts and Texas cichlids are different species
separated by millions of years of evolution, each adapted to different
environments. With so many cichlids threatened with extinction in the wild,
it's up to aquarists to help preserve them in captivity. Indeed, some are
effectively extinct in the wild already, and the only ones on Earth exist in
aquaria: species from Madagascar and Lake Victoria in particular.> I do
thank you for helping me with my fish, but i also wished i had never come across
your site.. <Look, as I said in the original message, I am genuinely not
trying to be mean. But I do have a responsibility to everyone in the hobby and
not just you. If you don't care about anyone else who might end up with your
fish (or their descendants), and have no interest in the welfare of cichlid
species, then that's not really something I can get my head around.> P.S. I
do not sell these fish, I give them to close family, and the truth about them
being hybrid. Plus they must give it back, if unable to care for it, just so
they wont become fish food, for larger fish. They have a right to live just as
anything else..Horrible, and shame on you... <I suggest you read some of what
I've said about feeder fish and euthanasia for example. When it comes to
senseless killing of fish, I'm absolutely against it. Much of what I write here
is about keeping fish happier as well as healthier: bigger schools of tetras,
livebearers with lots of females not just males, and so on. My record on animal
cruelty is pretty clear. It's a shame you don't see that on those few times
I recommend painlessly destroying fish (note the word "painlessly") it's not
because I like killing fish. It's because there's a bigger picture here. If
you're a vegan who has never harmed an animal in your life, then that's one
thing; but if you eat meat and dairy, wear wool and leather, then you're already
responsible for far more animal deaths than would be the case by euthanising
some hybrid cichlids. The "right to life" you talk about is contextual; as a
meat-eater and wool-wearer, I abhor animal suffering, but I accept that in some
situations killing animals is necessary.> May Santa miss your chimney this
year..for your evil thoughts... <Doesn't seem a very nice thing to say.
Please look at the big picture; this isn't about cruelty to animals, but about
responsibility and conservation.> Yes i know i am to old to believe in Santa,
and 'no' he does not exist,. But it's snowing here, and i still have some
holiday cheer...so...have a safe and pleasant holiday this year, okay I'll talk
to Santa..you may have children.... <Well, okay. Cheers, Neale.>
<<Mmm... the issue of producing, allowing hybridization between species in our
care is important, and still (obviously) a bit controversial. For the reasons
stated above in plain, simple terms, I am in agreement with Neale (Dr. Monks, he
has a doctorate in Palaeontology (spelling in proper English)...). I too wish
that we would choose to avoid this sort of "polluting"... as it is my concern
that our planet is just too small, changing too quickly in ways that are
damaging... self-defeating... to preserve the mix of genotypes/multiple allelism
that is the overall biota of our world. Methinks that too much, too fast
tinkering in allowing shifting of this mix is very dangerous indeed. I have
several speculations as to probable ultimate outcomes from breaks in the "web of
life" in a given biosphere... even world-wide... None are pleasant to
contemplate. Mmm, lastly a further general statement re our choices, choosing as
individuals... It has been my desire to impress on others how paramount it is to
understand themselves, facts... science behind important decisions... Whether we
have captive aquatic systems may seem minor compared with issues of our own
"carbon footprint", ultimately whether we reproduce ourselves... But I assure
you, the long- and- profound effecting actions of releasing non-indigenous
species to habitats that they displace, affect other flora and fauna, and this
question of mixing species that can, will possibly persist, go on to possibly
genetically mix further, IS of extreme importance. I ask you as a fellow
hobbyist, citizen and human of Earth to think carefully, to not engage in this
practice. Bob Fenner>>
Re: Swim Bladder in one day..I think... (Euthanising hybrids, why
it's necessary; RMF, feel free to comment) 12/18/08 I was just
going to send another e-mail, asking the Doctor to please excuse my language in
my earlier reply. I in no way, personally meant to insult the Doctor, on his/her
personal preference on the subject of mix race.. I too am of African/German
heritage. I was completely out of line.
<No harm done. Let's drop it, shall we?> I was am still stressing about my
beloved Texas, She isn't doing any better, i can only pray that she
does.<Cichlids do react badly, sometimes violently to sudden changes. Have done
this myself once, when changing water, and accidentally adding freezing cold
water from an outdoor rainwater butt into a dwarf cichlid tank. The fish went
crazy, rolling onto their backs and turning black. They did all recover though.
Keep the fish calm, ideally in a quiet, even dark, tank, and she should settle.>
I may also assure you, that I am not in anyway, trying to inter breed any type
of fish. They just happened to mate, they were in the same tank for three years,
and then one day, there were babies. I still have them, because I don't want the
fish store to pass them off as something else. They wouldn't buy them, but would
take them for free, same story, different line... <OK, we agree on this.
There's nothing wrong with hybridising fish for your own pleasure; it's when
they get into the "food chain" so to speak, that things get messy. To be fair,
many fish we keep as pets are likely hybrids already. Angelfish, Platies,
Swordtails, Mollies, perhaps even Goldfish, to name a few. But these fish are
normally sold as domesticated animals, and there's no risk of confusing them
with wild-caught specimens because wild-caught examples of these are virtually
absent from the trade. But cichlids are different, because we sell them not as
domesticated fish but as true species, and so confusion between the "real thing"
and a hybrid can cause problems.> Please let him/her know that the KMA is
Kiss My Angel fish..I should have said that straight. <Good catch!> Still
I under stand what you are saying, but even in the wild these things happen, so
i would not understand, killing them because it happened in my tank. We all have
our own reasons for things. But, to kill Gods creation, because of inter
breeding, is not something i would consciously do. <That's fine. If you want
to keep these fish at home and give them a good life, that's great. Giving them
to people you know won't breed from them is also good. But please don't let them
turn up in a pet store!> I do thank you other wise for the generous help your
doctor gave me, to try and save my girl. <I'm a doctor of rocks, not animals.
Not sure why Bob mentioned it, and it really isn't something that makes a
difference here!> I thank you once more. Lori <Good luck, Neale.>
<<Mmmm, I mention your scientific status for twofold reasons... that I'm
impressed that a person of such academic caliber is willing to devote their
time/efforts to help others in our hobby interest, and secondly, to bolster
credence in your response (this IS the west after all). I would like to last
make a comment re the supposed-safety of entrusting others with hybrids, or any
matter outside of ones immediate control. This doesn't happen... no one has any
recourse, knowledge of what might occur once this life is outside their
systems... To make utterances otherwise belies a lack of veracity, knowledge or
both. History is replete with examples of "animals, plants, algae, microbes...
let go"... and their lessons/consequences. Lastly, the hypocrisy and lack of
thought in ascribing to god/s our own actions/non-actions I find more than
distasteful. I reject such assertions out of hand. We made these idols and make
our own lives. That there is life, there is death... by "keeping" some, you doom
others... Bob Fenner>>
For Neale, please. Re: "pro-life view on fish hybridization"
12/18/08 Hi Neale, <Hello Nicole,>
I hope this doesn't add to the spectacle, but I just thought I would say, once
again: you have the patience of a saint! Your reply to the person who purported
to have the "pro-life view on fish hybridization" was incredibly gracious, given
that much of the message was personal bashing directed at you. <I prefer to
view these things as simple miscommunications, and figure it helps if both sides
try and state things a bit clearer next time around.> At least you were able
to find a silver lining, and expound on the topic like the scholar that you are
- informing many web denizens for years to come, surely. <Thank you.> I
would like to reiterate the obvious: since fish are not able to be neutered or
sterilized, if you are going to keep together species of fish that hybridize,
and they breed (as is inevitable), the only sensible thing to do is to euthanize
the fry or keep them yourself. Even giving them away to friends and family could
be tricky, since a handful of hybrid fish containing males and females might
well mate again and form yet another aberration! Giving them to the store who
will accept, but not pay, for them - well, two words: feeder fish.
<Unfortunately what you say is quite true, and an angle I'd not considered
(feeder fish being virtually unknown in the UK). It is a disturbing though that
any fish you give away to a pet store expecting to be re-homed could well end up
becoming food for a piranha. That being so, painlessly destroying unwanted fry
yourself is very definitely the humane option. It's also worth remembering not
even one in a hundred cichlid fry survive to maturity in the wild; that's why
most species produce hundreds of fry every couple of months, given the chance.>
The "innocence" of the fish has nothing to do with the responsibility we have --
as their keepers in glass boxes -- to euthanize the fry. To ascribe innocence or
guilt to a fish would be absurd. <From a theological perspective you are
quite right; animals, being amoral, can be neither innocent nor sinners. To be
honest though, I tend to work from a particularly good 'Calvin & Hobbes' cartoon
where Hobbes makes the point that he doesn't *want* to be given human motives or
behaviours, since he rather looks down on them. So why bring a decent, noble
animal down to our level!> These fish simply cannot be sold, the same way a
garden variety canine mutt cannot be sold at the pet store (only those designer
hybrids like labradoodles and cockapoos, but that's another story - there's a
fine line in there somewhere, certainly). <Variety dogs and cats are all
within a single species, so though the parallel isn't precisely the same as
humans (different "races" of humans don't equate to different breeds of dog)
certainly all dogs are as closely related to one another in terms of genes as
all the different humans on the planet are. That said, my dog breeding friends
insist that there is much harm done in the dog world by careless breeding, not
just in terms of unwanted mutts. But also things like German Shepherds cranked
out on farms with genetic disorders, or "en vogue" puppies of various types mass
produced with little interest in quality, just money.> Besides, if they bred
once, they will likely breed again, and then what are you going to do with 40
more Texvict cichlids? I bet your friends and family will be less enthusiastic
to receive them this time around! <No argument from me here.> Common
livebearers are basically a lost cause, a "purebred platy" is an oxymoron.
Malawi mutts are practically there, too...but now, this? <Again, no argument.
As someone who loves telling people that African cichlids can be like coral reef
fish in terms of colours, it's disheartening to see the same "mixed blue
Africans" in the pet stores, again and again.> Keeping species of American
cichlids from interbreeding is so preventable, and to say that these fish are
desirable because of having such unique colors and shape is just unreal. Sir,
that was born in '69 not '99 - who are you to be creating a new breed of fish?
<In this case, it was a genuine accident, and while not something I'd personally
want to see happen in everyone's aquarium, these things do happen. Like teenage
pregnancies, there's a difference between what you might say in terms of public
policy, and how you'd react when it was your own son or daughter involved. Not
that I'm putting these things on an equal footing, I hasten to add! But simply
as an analogy. As I said earlier this evening, there's nothing wrong with homing
these fish yourself and enjoying them. But the main thing is that these fish
aren't "turned loose" in the marketplace. If these fish did spawn again, this is
one situation where removing the eggs and disposing of them would be entirely
appropriate. Any catfish or loach of your choice should do the job for you, if
you're squeamish!> Thanks for listening to my rant, in reply to the ranter. I
personally hope that Neale finds lots of fish and telescope equipment in his
stocking! <Hmm... wet fish flopping about in my underwear... sounds fun!>
Wishing you all a very happy holiday, your friend in fish, Nicole <Thanks
for writing, and have a merry Christmas yourself. Neale.>
Re: Swim Bladder in one day..I think... (Euthanising hybrids, why
it's necessary; RMF, feel free to comment) 12/19/08 Hi Bob,
<Neale> I appreciate this, and thank you. But in all honesty, I doubt my
(pretty minimal) scientific credentials matter much compared against the
cumulative experience of the WWM crew generally. It's just a pleasure to be part
of this team. Cheers, Neale <Ahh, my friend... in the final synthesis, we
are indeed only whom we are, what we do... However, the benchmarks of our
activity, credentialing is of note, use at times. As for myself, I am satisfied
to have acted in my own best self interests, and have shared, am continuing to
share with others. For their enjoyment, edification... BobF>
Selling My Fish 11/11/08
Hi!
My name is Bel. I am 15 and I love to raise Livebearers. I have 4 tanks:
one 40 gallon, one 20 gallon, one 7 gallon, and one 1 gallon. I only have
4 neon tetras, and approximately 70 guppies, all raised by myself. I am at
the risk of overpopulation and would like to sell some of them, but I am not
sure how or where or to whom I should sell them. All the males and females
are separated so I won't have more baby fry for now, but I love raising fish and
would like to raise other Livebearers, but I'm afraid I'll have too many fish. I
would love to keep all of them, but I already have more babies and I don't want
inbreeding. All my guppies are from two fish, no inbreeding. All my
fish are very happy and healthy. I'm scared that if I go to pet stores
they won't buy my fish because I'm young and don't know a lot about breeding
fish. And my female guppies are very plain and generic colored, like a
sandy brown, so that might make it harder to sell them. But the males are very
colorful. They have red tails with green sheen and black spots on their body.
They also have some black and pink stripes. I don't think they are a
specific type of guppy, I think they have a delta fin or a fan tail. They also
don't look exactly like their parents. The males look like a mix of both
parents.
Here's a picture. Sorry if its a little blurry.
Any advice on selling fish would be greatly appreciated!
Thanks a million!
Bel
<Hello Bel. There's no perfect way to sell fish. You certainly can ask a
retailer to take them from you, and often you'll get credit in return. I did
this during the weekend with some livebearers that I'd bred, Limia
nigrofasciata. Go to the shop first, tell them you have some fish, and see if
they'll take them. Personally, I wouldn't sell them to a shop that trades in
"feeder fish" or "feeder guppies" -- because your fish are essentially wild-type
Guppies in colouration, it's possible some retailers might use them as fish
food! Another way is to join a fish club. Fish clubs have auctions and you can
also meet people who'll swap your fish for some of their fish. This is a great
way to get hold of rare livebearers or particular strains of fancy livebearer.
Or you could join a fish forum online: lots of these have a "buy, sell or swap"
thread where people can trade fish. For what it's worth, I think your fish are
nice, and I'm all in favor of wild-type Guppies. They're much hardier than fancy
guppies, and make much better pets for use in community tanks. Cheers, Neale.>
Peat moss to induce breeding?
10/6/08
Hi -
I have some Rasboras, some black Neons and some cherry barbs, all of which at
one time or another seemed like they were ready to breed (as evidenced by males
chasing the females around, and especially the Rasboras turning upside down on a
leaf).
<Certainly seems possible; that said, the tricky bit is getting the females in
"condition", i.e., ripe with eggs.>
However nothing has really happened or any eggs I may have missed have been
eaten. I bought a small 2 gallon tank with some marbles on the bottom to put a
small pair of fish to see if maybe they would mate and then could be removed
quickly. i have not added any pairs yet to the tank. what would you recommend to
induce mating?
<No single formula for all possible species. But in the case of Harlequin
Rasboras (Trigonostigma heteromorpha) breeding is quite difficult. You need
extremely soft water around 2 degrees dH (here in southern England where the
water has a hardness of 20 degrees dH, that's one part tap water to nine parts
rain (or RO) water. You also need to ensure the pH is stable, possibly by doing
large water changes frequently, but more than likely by using a pH buffer to fix
the pH at the required 5.5 or so. You also need to raise the temperature to
around 26-28 C, and then make sure the tank is positioned somewhere it gets
morning sunlight. The water also needs to be filtered through peat or treated
with blackwater extract, and not too deep, around 20 cm. Assuming all these
things are provided, they should spawn eventually, laying their eggs underneath
broad leaves (such as Cryptocorynes). Your 2 gallon tank is way too small for
breeding fish; look for a standard breeder tank at least 30 litres in capacity
and 60 cm long. Spawning is often a frenetic process with much chasing, and
you'll frequently need to maintain the adult fish in the breeding tank a fair
while, and of course provide decent water quality for the developing fry,
something impossible in bucket-size tanks.>
i hear adding peat moss to filter, raising temperature, may help. thanks, bob
<Do spend time with Baensch's Aquarium Atlas and the like, researching the
species you're interested in. Cheers, Neale.>
Breeding, sel. FW species 8/18/08
hello everyone!
<Hello! Hope you are having a great day! Merritt here today!>
I just recently bought another tropical tank (which makes three) and I want to
try and start breeding another breed of fish. I would prefer livebearers but I
suppose that I could accomplish egg layers.
<The best livebearer that comes to mind is killifish. I have seen some as
colorful as Bettas.>
I have been breeding Guppies since October and have been very successful. What
breed of fish do you suggest for me? Bettas have crossed my mind but I don't
have enough housing for them because the males need to be separated.
<Do some research on the amount of work you would like to contribute to breeding
before making a choice and I am only naming a handful of potential fish you
could breed so don't limit your choices to these, they just happen to be some of
my favorites. Some other types of livebearers that I have breed successfully are
Mollies, Platys and Swordtails, they are in the same family as the Guppies so
you should not have a problem. I have tried for many years to breed Bettas, but
no such luck and I would not recommend them due to the amount of space they
require. If you want to try some egg layers I would definitely recommend the
killifishes due to their coloration. Here is a link so you can read up on the
killifishes:
http://www.wetwebmedia.com/ca/cav1i1/killies1Goldstein/killifishes.htm>
Here is a short description of my tanks.
Tank #1: Main Tank/ Bully /Show 29 gallon
Tank #2: Baby Guppy tank 10 Gallon
Tank#3: Guppy tank/ breeding tank 10 Gallon
<Your system setup sounds perfect for the Mollies, Platys and Swordtails.
-Thanks!
<Hope you find a match!>
_Sarah
<Merritt A.>
Don't know what I should
do... Sel. FW fish species to breed 8/17/08
hello everyone!
<Ave,>
I just recently bought another tropical tank (which makes three) and I want
to try and start breeding another breed of fish. I would prefer livebearers
but I suppose that I could accomplish egg layers. I have been breeding
Guppies since October and have been very successful. What breed of fish do
you suggest for me? Bettas have crossed my mind but I don't have enough
housing for them because the males need to be separated.
<Before breeding any fish, ask yourself two questions: Firstly, what's your
water chemistry? There's no point trying to breed something that needs water
chemistry you can't supply. Secondly, are there limits on what juvenile fish
you can give away/sell? A lot of fish shops won't accept "mixed" African
cichlids or mongrel livebearers because they can't sell them. So if you're
going to breed, say, Platies, you need to make sure you start with virgin
females alongside males of the same breed so that you get consistent,
sellable offspring.>
Here is a short description of my tanks.
Tank #1: Main Tank/ Bully /Show 29 gallon
Tank #2: Baby Guppy tank 10 Gallon
Tank#3: Guppy tank/ breeding tank 10 Gallon
<A 10 gallon tank is fine for rearing livebearer or cichlid fry, but too
small to house adult livebearers of the common types because the males are
so aggressive and tend to harass the females. Even a 20 gallon tank will be
too small for a male Molly or Swordtail who decides to throw his weight
about (and most of them do). So reflect carefully on social behaviour before
laying down the gold on a particular species of fish. If you live in hard
water, you might consider something like shell-dwelling Neolamprologus, such
as Neolamprologus brevis or N. multifasciatus. A colony of these (six or
more specimens) could be housed very easily in a 29 gallon system. Fry could
be removed and reared on separately, and selling these dwarf Tanganyikans
shouldn't be difficult. If you're in a soft water area, then you could go
with a group of dwarf cichlids, perhaps Apistogramma cacatuoides. Get one
male and multiple females because Apistogramma are "harem" spawners.
Alternatively, you could go with a pair of Laetacara curviceps or
Pelvicachromis taeniatus. Again, selling surplus juveniles of these
peaceful, colourful small cichlids shouldn't be difficult. If you want to do
some unusual livebearer, I'd look at something like Dermogenys pusilla as an
adaptable fish that's a bit more of a challenge than the usual livebearers.
Being relatively uncommon in the trade, selling the juveniles isn't hard at
all.>
-Thanks!
Sarah
<Cheers, Neale.>
Regarding mullet breeding – 07/16/08
Respected Sir,
I am Ph.D. student of aquaculture from India. I would like to know more
information regarding induced breeding of mullet. If u have any information
regarding this topic please help me by giving some latest paper and any article
regarding the same.
regards
Gauri
<Mmm, I worked on hormonal manipulation of Mugil cephalus for my Master's
thesis... but many years back (the 70's)... I do have the bibliography from that
time... in print, not electronic format... But I suspect you'd be better off
generating a totally new one. If there are specific questions I might help you
with, please write me. Bob Fenner>
Marine fish breeding
Ornamental marine fish breeding ref.s 6/18/08
Good day sir
<Howdy! Yos!>
I just got a copy of your book on marine fish 2 days ago and i have not
put it down since. I am interested in breeding marine ornamental fish in
captivity. I bought your book so as to learn how to create a marine
environment and to my surprise it contained so much more.
I also bought a copy of Joyce Wilkerson's book on clownfish and i
believe it contains all the information i need on that particular specie.
But before bore you with the list of books my library collection i would be
glad if you could assist in my quest to be a successful breeder of marine
fish
I would be grateful if you could supply me with a list of marine fish
that can be bred in captivity and information on breeding them or where to
get such info. It would also help if i could get an price list for these
fish so that i can put that into consideration before starting .
I am eagerly anticipating your reply
THANK YOU
<Mmm, do you read German? There is a nice, recent, comprehensive work on
marine fish culture... including small scale operations... See the book,
link here:
http://209.85.141.104/search?q=cache:YbFYZ1EiYzwJ:www.wetwebmedia.com/AqSciSubWebIndex/marorncultfaqs.htm
+dieter+brockmann+fish+breeding+book&hl=en&ct=clnk&cd=1&gl=us
Bob Fenner>Re: Marine fish
breeding 6/19/08
Thank for your quick reply, unfortunately i am African and do not
speak German. The aquarium industry is not very well developed here hence my
need to source for information from more developed countries. I have checked
Amazon and there is no English translation to the book yet.
<Yes... I wrote the marine fish overview... I do wish it were available
in other languages... My piece is posted on WWM>
Thanks for your help though.
<Please make it known if I can answer specific questions. Good luck in
your endeavour. Bob Fenner>
|
Unexpected fish, FW
Greetings to the Crew,
<Tom>
So, 6 weeks ago, I set up my 55 gallon quarantine tank to restock my 180 gal FW
tank (previous one sprang a catastrophic leak). First, I kept a group of 8 giant
Danios for 2 weeks, then moved them to another tank. Then, I moved a school of
about 20 boesemanni rainbow fish into the quarantine tank for two weeks. Last, I
kept a group of 6 Cory cats in the quarantine tank. As I was transferring the
Cory cats, I saw very small (fry) fish in the quarantine tank. They don't look
like baby catfish. Could they be boesemanni?
<Yes... or possibly Danios>
Surely they're not Danios, since I would assume the boesemanni would have eaten
them during their two week stay. Or is it more likely that
I picked up some fish eggs from the LFS during my purchase of the Cory cats?
<Mmm, not near as likely>
Or perhaps fish eggs came with the boesemanni (I ordered them from Foster and
Smith.)
<Also unlikely. Were the boesemanni of size? Reproductive size?>
I am feeding them finely crushed fish flakes for now.
What are your thoughts on what I likely have? There are about a dozen of the
tiny fish.
tom
<I say... bonus! Enjoy them. Bob Fenner>
Fish Repro...
12/31/07
Hi, I have a quick question for you guys. Can fishes still spawn even if
they aren't kept in groups? Do all fish spawn? And last, how often do fishes
spawn?
<What? Mmm, no... all fishes do not spawn... that is, shed their gametes
directly into the environment... See an ichthyology text re piscine
reproduction. Bob Fenner>
Africans. Cichlid
Economics-Which Ones to Breed 9/27/07
Hi, I have had convict cichlids for about a year. They have had babies and
all that fun stuff, but when I went to get rid of them,
sell them, or trade them nobody would take them because
convicts aren't that "special". I talked with someone
and they said that I could do African cichlids and be
able to sell them. What I want to know is what would be
the best in terms of sexing ability (like how easy),
color, and how well I would be able to sell the
offspring. Do you have any suggestions? I would like
something with some color, and something that would look
good. Along with that something that I would actually be
able to find and buy, not something that is so rare I
wouldn't be able to find. I have 20-30 gallon tank that
I keep well maintained so an African about 4-6 inches
would be good right? Thank you for your time and help!
Kevin
< There are many cichlids that are easy to breed. The
difficult part is to find the fish your customers want.
If your customers are going to be the retail stores then
I suggest that you ask them for recommendations for fish
that they want. Usually the best sellers are already
being sold from local wholesalers or local breeders in
your area. Selling a single species over the internet is
difficult. The freight is very expensive and usually is
too costly to be practical. Off hand I would suggest Ps
saulosi. The females and fry are bright yellow. The
males turn light blue with black fins and bars at about
an inch and a half. Remember, when you are in the fish
business you are working with fish that your customers
want. These aren't always the fish you are interested in
keeping.-Chuck>
Re: Africans, Cichlid Economics II –
9/27/07
Do you have any more suggestions to popular Africans that would be good
sellers?
<Different fish are available in different parts of the country. Which ones will
sell is a matter of supply and demand. In general look for fish that are
sexually dimorphic. That means that the males and females look similar. Get fish
in which the fry and the females have color. Fry with color are much easier
sellers then fry with no color. For instance, take the genus Aulonocara, also
called the peacocks. Adult males are very sellable because they are very
attractive. Females and fry of this genus hardly sell at all because they have
no color. A species that is not sexually dimorphic would be Ps Demasoni. These
fish all look the same no matter what the sex or the age. This makes sexing them
a challenge. Males tend to be a darker fish overall.-Chuck>
Re: Africans, Ps. saulosi Behavior –
9/27/07
Thanks for your input. I am going to consult with some local pet stores to
see what Africans are popular. Are these Ps saulosi easy to breed?
< They are maternal mouthbrooders. A group of a male to 4 to 5 females will keep
you busy with lots of fry.>
What is there behavior like?
< Not too bad. they are generally a smaller fish getting about three inches
long. Males defend territories but they are not nearly as aggressive as some of
the others.-Chuck>
|
Keeping Fry Tank Clean – 09/10/07
Hello,
I want to commend you guys on your wonderful website.
I am a relative newcomer to the hobby (6 months), recently I noticed that my
pair of Zebra Danios were ready to spawn. I separated them into a spare 5 gallon
tank and when they spawned I replaced them into the main tank. The eggs hatched
and I have around 20 fry. I have a sponge filter running and on advice from my
LFS I added two snails unsure what type), however I am still having difficulty
keeping the water clear. I do regular water changes and 1-2 days afterward the
water is cloudy again. Can you please help me out here?
Thanks,
David
<Hello David. Congratulations on your new babies! No idea why you were
recommended to put snails into the breeding tank, but they shouldn't do any
harm. Anyway, if the water is cloudy, you may be overfeeding the baby fish. Feed
multiple small amounts rather than one or two big meals. Typically, 4-6 meals is
considered about right for the first few weeks. Siphon out any uneaten food. A
turkey baster is a very useful tool for this because you can pipette out
detritus very easily without sucking up baby fish. But any similar device, like
a syringe or pipette, will work well. You also need to do regular water changes;
50% every couple of days would be appropriate. Any basic filter should work fine
for keeping the ammonia levels low. Hope this helps, Neale>
Please help me for higher study - 7/23/07
Dear sir,
Hope you are well. I am Nahid Akter from Bangladesh. Now I am serving as a
Lecturer in the Department of Aquaculture, Hajee Mohammad Danesh Science and
Technology University , Dinajpur , Bangladesh . Before Joining here as Lecturer,
I have completed my Master of Science (MS) Degree from the Department of
Aquaculture, Bangladesh Agricultural University, Mymensingh, Bangladesh. During
my MS study, I have to conduct a research work and submitted a thesis entitled
as “Study on Health Condition of Freshwater Eels of Ailee Beel, Mymensingh” to
the department of Aquaculture. My research work includes Investigation on health
conditions of two freshwater eels, Monopterus cuchia and Macrognathus aculeatus
of Ailee beel, Mymensingh district through clinical and histopathological
observation. Moreover I have also studied the histopahtological study of other
six (Puntius sophore, Nandus nandus, Heteropneustes fossilis, Channa punctatus
and Mastacembelus pancalus ) small indigenous species.
I think I am able to study any kind of fisheries related field. Thus I wish to
do advance research in my related field. Please sir select me as your student.
No more today. Wish your sound health. Keep in touch.
Sincerely your's
Nahid Akter
<How is it that I/we may be of assistance? Bob Fenner>
Re: Please help me for higher study, FW
aquaculture 7/26/07
Dear sir,
Hope you are well. Thanks for your mail but unfortunately I can't understand
your mail. Most probably the message is flagged. So it is very helpful for me if
you send me again the mail. Request to you please please help me. For your kind
information here I have attached my CV so please see it and consider me as your
PhD student. I am waiting for your mail.
<Are you looking for a work or scholarly position with us? We are an all
volunteer organization helping people, companies in ornamental aquatics via the
Net. We do not do aquaculture, nor are we an accredited learning institution.
Bob Fenner>
Again thanks and best regards.
Sincerely
Mst. Nahid Akter
Lecturer
Dept. of Aquaculture
Faculty of Fisheries
HSTU, Dinajpur-5200,
Bangladesh.
Otocinclus <maybe Danio> fry, fdg.
6/30/07
About a week ago, maybe less, I had my husband remove a few plants that
weren't looking so hot from one of our aquariums. He thought something along the
lines of putting them in a bucket and seeing if they would look any better (It
couldn't hurt)
<Ahh... a good friend grows such plants almost year-round outdoors here in San
Diego... spectacular results>
So they were outside in a bucket...some morning sun, nothing too harsh. Tonight
he was going to put the plants back in the tank and dump the bucket... being
always worried about Cyanobacteria and such I bent down and peered real good at
them, and noticed a tiny movement. We have some incredibly tiny fry. I have
never seen any fry this small... the only breeding fish I have are angels and
guppies I guess. But the tank these plants came from had: angels, serpae tetras,
Columbian tetras, neon tetras, zebra danios, Otocinclus cats and a pair of Cory
cats.
<I see...>
After looking at someone's video of fry, it looks like they may be Oto fry...
very very tiny, almost invisible from the side.
So they are in the hospital tank now, along with the plants from the bucket and
in the water that was in the bucket... we had heavy rains today and the bucket
overflowed. We have about 20 fry left. What should I try to feed them.
<"Infusoria" would be ideal... see the Net re... But a pre-made commercial food
prep. is the only thing practical here. See the Net, your LFS re such... "tube
food"...>
I thought of rotifers since they are tinier than baby brine shrimp, but if they
are otos it would seem that wouldn't work at all. I also have a package of
Hikari first bites that is as fine as talcum powder and contains many things,
among them Spirulina, milt meal, along with some krill meal and such.
<The liquid "tube food"... egg-yolk based...>
I'd hate to see them die, especially after the miracle of even seeing them to
begin with.
Any ideas? If I put a hulled pea in there would they nibble on that? The plants
have a little algae on them as well but the fry are so darned tiny...
Julie
<Might be the Danios otherwise... Oh, and congrats! Bob Fenner>
Reproduction of fish in 10 G tank 6/6/07
I have a question about reproduction in my ten gallon tank. I have 2
Sunset Fire Wag Platies, 3 Red Eye Tetras, 2 Black Neon Tetras, and 1 Golden
Algae Eater. Is it possible for the different types to reproduce together?
<No.>
I have also noticed that one of the platies is getting "chubby" and has a
darkening belly. I am not sure what gender the fish are.
<Possibly a pregnant female. As pregnancy goes on, the developing embryos
are pushed against the body wall, darkening it in places. This dark patch is
the "gravid spot". Female platies have triangular anal fins, whereas male
platies have crooked anal fins bent over into a structure used to inject
sperm into the female. So sexing them is usually easy. On top of that, males
are generally smaller than females, though this isn't obvious if you have
fish of different ages.>
One of the Red Eye Tetras is fatter than the others.
<Female tetras tend to be bigger and more rounded.>
P.S.-
The "chubby" platy has been getting slower and sometimes stays at the bottom
of the tank. It doesn't go up for food very much when I feed them. Is there
a way to check if my fish are pregnant?
<No way to check as such, but as the female swells up her condition should
be apparent. If you have boys and girls in the one tank, you can almost
guarantee the females will be pregnant.>
How large would the fry be?
<Around 10 mm when born. Think about the size of a live brine shrimp, and
you have a good idea of the size.>
Would they be eaten?
<In your 10 gallon tank? Yes. Please read over some of the articles here to
find out how to avoid this. See:
http://www.wetwebmedia.com/FWSubWebIndex/livebearers.htm ,
http://www.wetwebmedia.com/FWSubWebIndex/poeciliids.htm , &c.>
Can a Black Neon Tetra Reproduce with a Red eye Tetra?
<No.>
-Josh
<-Neale>
Mullet culture, fingerlings source 3/19/07
Dear Sir:
I am Maryam Jorjani and am working Golestan Fisheries Research Center in Iran.
we are researching about propagation and larviculture Mugil cephalus. now we do
not have this fish and we need to provide fry / fingerling. do you know person
that help us?
Thanks a lot .and I am waiting for your reply
Maryam
Golestan Fisheries Research Center
Gorgan
Iran
Tel:+981712222601
Fax:+981712240290
<Pleased to meet you. I did work on this Mullet species' aquaculture years
back... but I don't know where you can commercially purchase young. According to
fishbase.org:
http://fishbase.sinica.edu.tw/tools/aquamaps/receive.php
M. cephalus range extends into the lower Persian Gulf... Could you collect it
from there? (the young are easily seined in shallow water where found. Bob
Fenner>
Do you have detailed filtration set up for farm near to the sea ? Thanks and
appreciate 1/3/07
<Mmm, for all the physical, mechanical aspects? No... Can you state
specifically or at least more definitively what you're looking for...? What
species you hope to culture... extensive vs. intensive? How big an enterprise...
Do you need to supply your own electricity? Bob Fenner>
"Believe nothing, no matter where you read it, or who said it, no matter if I
have said it, unless it agrees with
your own reason and your own common sense." -- Buddha (563BC-483BC)
<Good spiel>
Small rearing tanks... 11/27/06
Hey I was thinking of getting a 5 gallon tank to put baby fish in and I had
2 questions. One is about how many fry can <I> fit in one 5 gallon, and what
kind of filtering and heating would be best for a 5 gallon tank?
<Hey Tommy, JustinN here with you today. A 5 gallon tank would work for fry,
depending on how diligent you are with water quality maintenance, and how large
you wish to let them grow to. The number that would fit in the tank would be
dependent on the species of fish you're wishing to breed. As far as filtration,
a colonized sponge filter and a 25 watt heater should be sufficient. Hope this
helps you! -JustinN>
What to Breed? - 10/21/2006
Dear Crew, My precocious pre-teen daughter bred a pair of store-bought
Bettas two years ago and successfully nurtured the fry with micro-worms and
nauplii. She wants to raise another brood of fish fry next summer. My guidance
to her is to breed fish that the local fish store (LFS) would be glad to accept.
This way, the LFS can find good homes for them and we would not have to discard
the fry. We are considering show quality Bettas from select breeders, and
rarities, such as the Peacock Gudgeon (Tateurndina ocellicaudus), from New
Guinea but we are running out of fish selection ideas. Do you have any
recommendations for a freshwater fish that can immediately generate demand for
its rare beauty? We are experienced with advanced husbandry practices for both
freshwater and reef aquaria but wish to stick with relatively small (1 to 2")
freshwater fish. We have built freshwater systems using Diana Walstad's
ecological practices and currently maintain a marine reef system with natural
nitrate reduction.
Thanks very much,
Paul.
<Well you just happened to get a Pleco breeder to answer your question, so I'm
too sure our ideas of beauty will match! But I like your idea of breeding the
Peacock's. Or along that line, maybe Desert Gobies. Both are short lived fish,
breed them or loose them. A good live bearer to work with would be Endler's. If
you want to try breeding Plecos, try Albino Bristlenose. Easy to breed and there
is always a market! If you want a Plec that is a little more fancy, and
expensive, any of the species in the genus Hypancistrus will sell. Don>
A Request: re the Myriad of influences on (et al.) breeding, hatching,
rearing of FW fishes 7/18/06
Sir,
I am a research fellow working in induced breading of some freshwater
fishes. I have found your article in the internet-"Captive Production of
Ornamental Marine Fishes: An Overview". The work, It seems necessarily a nice
one. But sir, I doubt if there are so many physical and chemical parameters
determining the spawning and later the survival of the hatch out larvae.
<Indeed, there are several... as in the Middle English meaning of the word:
"many"... some demonstrably more important than others...>
My doubt is Sir, if this is the case, whether there is a chance to have any
significant relation between the photoperiod and the hatching success of eggs?
<Yes... a matter of science...>
I mean Sir, after spawning and before hatching whether there is any effect of
the photoperiodism on the development of the eggs
Sir, your answer to this question will be very beneficial to me and I request
you Sir to have a serious look upon this and reply me as soon as possible
Thanking you Sir,
Binesh. CP
<Time to have a visit at the college library... Search BIOSIS, the Zoological
Records... with the terms "Photoperiod", "Breeding", "Freshwater fishes",
"Effects". Bob Fenner>
Link/partnership issue ... prawn aquaculture in the Middle East -
05/22/2006
Hello,
I have found your website
http://wetwebmedia.com/ when searching the web on the topics related to my
website theme.
I must say your site content is very good and I think we would benefit much from
possible partnership - for example link exchange. This would bring more targeted
traffic to our sites, plus increase our websites' weight at the search engines,
as they give greater value to the links from the topic-related sites rather than
irrelevant backlinks.
My website
http://www.robian.com.sa/ is definitely related to yours.
I would be glad to link to your site in return to you linking back to mine. Feel
free to email me direct to XXXX@robian.com.sa to discuss the details on the
possible partnership.
Hope for the fruitful cooperation,
Best regards,
Yawar Nawaz,
http://www.robian.com.sa/
<Our content and reader-base is almost entirely pet-fish/ornamental oriented...
Not aquatic source protein generation. How would this link
benefit our intended audience? Bob Fenner>
Seaweed culture 8/31/05
Bob
I was going thru ORA's website on how they culture seaweeds.
What do they mean when they say they use "An air-generated method of tumbling
the algae in large vats is employed to culture them."
<Air bubbles, from pressurized air, are released in a circular (torus) fashion
on the bottom of circular tanks, lifting water and the algae and turning it
"donut fashion" in the water... gives all exposure to light, moves nutrients
about. BobF>
http://www.orafarm.com/algae.html
regards
Perry
Fish Breeding Business... you've come to the right crewmember
I have been searching all over trying to get information about starting a
wholesale freshwater fish breeding business. Could you direct me to where I
might locate some information? You seem to have all the answers. Thanks for a
very informative site!
>>Stacy,
Not sure what species you are planning on breeding. Because of the costs
involved few species are worth breeding for a profit in North America.
The thing to start with is to identify what species you want to breed, and
check to see if you can produce them at a competitive price. You will compete
with places that have free heat and very cheap labour, mostly in Asia. So it is
not easy. Some larger cities have a good market for locally raised angelfish,
but unless you are able to produce large numbers and sell for cheap it may cost
too much to heat the place and provide food and labour for your "product". Good
Luck, Oliver
Info on Growing Coral for Reef Restoration
Hi,
I am looking for information about growing coral in labs to have it eventually
transplanted back on the ocean for reef recovery? Do you know where I can find
information about this?
<Mmm, there are plenty of such schemes, folks involved in such plans, only a few
actually doing something re. Walt Smith is one of these latter>
Do you have anyone on your website in the academic community that may know about
reef restoration?
<Mmm, likely Anthony Calfo is a good place to ask here>
Thank you for your help.
~Melody White
<Will Bcc both in hopes they will contact you. Bob Fenner>
<<See
Google search here. Look for CORL (Coalition Of Reef Lovers), a
non-prof. organization that supplies areas in need with concrete "cages" upon
which to grow corals. They use coral plugs from the area, not lab-grown
specimens. Also, ArtificialReefs.org, makes "reefballs". The AMDA is
another avenue of exploration. Marina >>
Researchers Reveal Infectious Impact of Salmon Farms on Wild Salmon
A Dietician's Discussion
Thank you for the information posted related to this topic. I forwarded it
to my daughter, who is very involved with sea life and environmental issues, and
below is her response, which I forward for the benefit of those interested in
the topic. I have left her name and email address as well as website URL for
anyone wishing to search further into the subject or make direct contact.
Digna Cassens, MHA, RD
http://groups.msn.com/RDForum
>>Thank you for forwarding this research to me, I will be posting in tomorrow's
"Dailies" on WetWebMedia. This is already a well-known problem, not JUST with
aquaculture of salmonids, but in many other areas of aquaculture where wild
stocks and farmed animals have an opportunity to mix. This would include the
farm-raising of shrimp and other coastal species. It should also be noted that
wild stocks are breeding with "feral" stocks, escapees, which is leading to
other problems. These include change in growth and breeding rates, as well as
longevity in the wild.
All should know that, along with feed designed to improve color (visual appeal),
such facilities often treat with antibiotics prophylactically (as well as to
treat secondary infection due to parasitic infection) - this of course leads to
many organisms becoming resistant to such, as well as "downstream" consumption -
ingestion by humans. Folks should be aware that treatment of parasitic organisms
is necessarily harsh/toxic. This may include the use of copper containing
treatments. Ivermectin, typically an antiparasitic seen for the treatment
of internal parasites in horses, is also being used. Sea lice are only one
organism that is problematic, Cryptocaryon irritans is another problematic
(protozoan) parasite.
The salmon farming industry has fought long and hard to prevent studies that
are harmful to their livelihoods, this would include the following. The debate
is contentious indeed. Marina Harding<<
Public release date: 29-Mar-2005
http://www.eurekalert.org/pub_releases/2005-03/s-rrt032405.php
Contact: Jessica Brown
<jbrown@seaweb.org
>
Researchers reveal the infectious impact of salmon farms on wild salmon
Increase in sea lice infections of wild juvenile salmon are potentially
deadly and extend for 30 km beyond farm.
A new study published in the March 30th edition of the
prestigious scientific journal Proceedings of the Royal Society B (a publication
of the UK's national academy of science) shows that the transfer of parasitic
sea lice from salmon farms to wild salmon populations is much larger and more
extensive than previously believed.
This quantitative analysis of parasite transfer is a
scientific milestone in a contentious debate. It is the first to isolate and
measure the impact of a fish farm on sea lice outbreaks in wild salmon.
The study combined new field techniques that allowed comprehensive, individual
observations of over 5,500 young wild pink and chum salmon over 60 km of
migration route; an enormous data set from months of laborious fieldwork; and
state of the art models of disease transfer.
"Our research shows that the impact of a single farm is far
reaching," says lead author Marty Krkosek. "Sea lice production from the farm we
studied was four orders of magnitude - 30,000 times - higher than natural. These
lice then spread out around the farm. Infection of wild juvenile salmon was 73
times higher than ambient levels near the farm and exceeded ambient levels for
30 kilometers of the wild migration route." This increase in sea lice
abundance is likely to be damaging for already dwindling wild salmon populations
in British Columbia, where the study took place.
In Europe, transfer of parasites is generally accepted as a
significant threat to adjacent wild populations - although European studies have
not measured the direct transfer of sea lice from farms to wild salmon.
However, a bitter debate continues in British Columbia and the Pacific Northwest
as to whether salmon farms are contributing to sea lice infections of wild
salmon at all.
"Parasites are a key negative side effect of fish farms on
the local fish stocks," says Andrew Dobson, an epidemiologist from Princeton
University who researches infectious diseases in wildlife. "We're seeing similar
effects in Scotland, Norway, and Ireland; in each area parasite amplification on
fish farms seems to increase disease levels in the local fish community.
However previous studies have not shown nor quantified the direct transmission.
This study captures the chain of events."
"Part of the contentious debate about sea lice is that there
hasn't been this level of precision in the sampling and modeling," says coauthor
Mark Lewis, a mathematical ecologist from the University of Alberta known for
his work on West Nile virus and invasive species. "We have worked out the
spatial footprint - the data are strong and show that the farms are having a
significant impact over a very large area."
The researchers isolated the effect of the salmon farm by
studying the infection levels of migrating juvenile pink and chum salmon as they
approached and passed a salmon farm. Within the study area, the salmon farms are
anchored in a long thin fjord. Here the wild salmon have no choice but to pass
by the farm on their seaward migration.
The scientists developed new, non-lethal sampling techniques
that allowed them to examine thousands of the fish for parasites, taking
measurements every 2 to 4 km. The fish start in the rivers and head to sea,
traveling en masse in large mixed schools. Thus the scientists could see the
effect on the salmon as they moved toward the farm. They found that the juvenile
salmon carried almost no sea lice prior to the farm but became heavily infected
as they approached it.
Unlike other species, pink and chum salmon leave their natal
rivers while still much smaller than your baby finger - 3 cm long - and weighing
only half a gram. "The youngest fish can be only days old when they encounter a
farm," says Krkosek. "Some of these fish are so young their egg sacks haven't
been fully absorbed - even fish this small are infected."
The anchored farms, open cages of closely packed salmon, are
aquatic feedlots providing the ideal conditions for the breeding and spread of
sea lice amongst the adult fish. For the migrating wild salmon, the farm is a
concentrated point source of infectious lice larvae.
"We found lice levels exceeded what we would find normally,
extending for 30 km - even though the farm is only about 0.2 km long," says John
Volpe, the third coauthor from the University of Victoria. "Conservatively this
means that the parasite footprint of the farm is 150 times larger than the farm
itself."
Sea lice can lower the fitness of salmon - and in some cases
be lethal - as they create open lesions on the surface of the fish that
compromises a fish's ability to maintain its salt-water balance. When infection
rates are high enough, the parasites feed on the fish at rates greater than the
fish can feed itself, literally eating the fish alive. Adult salmon can survive
sea lice infection, but young salmon are much more vulnerable due to their small
size.
Under natural conditions, juvenile pinks and chum do not
typically have to contend with sea lice because the adult salmon are far out at
sea and are widely dispersed. By the time the migrating pinks and chum normally
encounter lice, the juveniles have had the time to put on body mass and build
resistance. The location of the farm near the natal rivers undermines this
natural coping strategy.
The field study also discovered a new cause for alarm: once
the young salmon pass the farm and pick up the sea lice, the migrating school
becomes a moving cloud of contagions. Sea lice larvae mature and reproduce on
the seaward salmon with each louse producing 300-800 eggs. This second round of
lice larvae can re-infect the fish in the school and can spread to other
previously unexposed populations coming from geographically disparate regions.
"At about the 30 km mark from the farm, those lice become
reproductive," says Volpe. "In effect, the farm has exported its lice generating
properties - a cyclical event establishing the potential for re-infections up
and down the coast. As the abundance of lice increases, we are now realizing
that lice will attack other species, not only salmon, but other fish such as
herring which are the spark plugs of the entire ecosystems - everything depends
on them - from salmon to whales to seabirds. Every commercially important fish
is either directly or indirectly dependent on herring."
"Previous studies have been dismissed by industry, but past
studies haven't looked at such large samples or the spatial aspect," says
fisheries biologist Ransom Myers of the University of Dalhousie. "This study
goes far beyond a theoretical model. They tested the model in the real world,
using an enormous data set, and saw the same patterns. It is a very thorough
analysis."
"We've tried to be very careful and conservative - but there
is potential for a major impact on the survivorship of the migrating salmon,"
says Lewis. "The next step is to thoroughly investigate the degree of impact on
wild populations," adds Krkosek. The authors concur that their findings point to
a need to reconsider the premise of industrial scale fish farming in wild salmon
habits. "There's a double bottom line here. The full ecological costs of
industrial scale salmon farming must be quantified as well as the economic
ones," says Volpe. "For the migratory runs we studied, there may be very little
time left."
Additional information and visuals will be available at
www.math.ualberta.ca/~mlewis/SeaLice/npSeaLicePub.htm
Using WWM
Hi Bob,
Last time I asked you a question I meant to ask how do you know if a white skirt
tetra is carrying eggs can you help me thanks!! Louis E
<Please read here:
http://www.wetwebmedia.com/FWSubWebIndex/characiformfaqs1.htm
Bob Fenner>
A Good Question - Culling fry humanely
When breeding goldfish and getting your spawn, what is the most humane way
to cull the deformed or inadequate goldfish fry?
Regards, M
<To place them in a bag with little water, freeze them. Bob Fenner>
Looking for Bass Fry
I have searched internet and run across your website.
I am emailing you and ask for your help because we think you are an expert in
fishery or you
have some contacts with those people who are in fishery
We are looking for the larvae/fry of Green Grouper ( Epinephelus coioides or
Estuary Cod ) with a large quantity for our fish farm in Philippines.
We need :
200,000 larvae and fry per month ( for Fry, the size 1 cm or less than 1 cm is
the best,
the size 1.5 - 2 cm is OK )
If you can supply or help us to buy these quantities, please contact us
at : azfish04@yahoo.com
Thanks in advance
Dean
<Dean we don't "do" aquaculture, but would check through the World Aquaculture
Society membership here.
http://www.was.org/main
Bob Fenner>
FW shrimp cultivation
Dear Bob,
Can shrimps be cultivated in fresh waters - like farm dams where we
raise tilapia (breams) fish?
Best regards,
Chileshe Mutale
<Mmm, some species, yes... are polycultured thus. Bob Fenner>
Eggs in Tank
Hi. I have a 75 gallon freshwater tank. Perfect water. I have some Gourami,
Pleco, Cory cats, Neons, Danios, moors, etc. Not very many. <OK, but I'd lose
the goldfish (moor). They need cooler water than the others and are large waste
producers> The tank has been set up for about 5 months. I recently went to
PetSmart and purchased Neons. I went against my better judgment and bought them
despite seeing an outbreak of snails in their tanks. <Not always a bad thing>
Two days later, in my tank, I have groups of small white egg looking things,
about the size of a pencil lead, probably 10-12 groups mostly on back of tank.
<Cool> My two largest Gouramis have been pretty aggressive lately, <Natural,
especially in males> but not causing damage. Are these eggs from the Gouramis,
<No, they make a bubble nest at the surface> or could they be snail eggs?
<Maybe, but don't sound like it. Common "pond" snails lay eggs in a jelly-like
mass> No other changes in the tank, water same, filtration same. Help???
<I think your Corys are doing the nasty. A sign of your fine care. Congrats! I
doubt you will get any hatching in this tank though. All your fish, except the
moor, will eat the eggs. Even the parents. I would be surprised if the Pleco did
not eat them all tonight. Not a bad thing at all. Don>
Thanks Robyn
Re: Eggs in Tank
Thanks for such a quick response. I won't worry at all. I'll just keep
watch. So far, it's been 4 days and they are still there. <Wow, you may get some
to hatch then> I do feed the fish enough food, three times a day, so maybe they
aren't that hungry or they haven't noticed them yet. Thanks again. Robyn
<Oh, I'm sure they've noticed them. They just don't recognize them as food and
aren't hungry enough to experiment. Any that do hatch will have a fair chance of
survival. Not many fish that will take on those sharp stiff fins. Feeding could
be a problem, but maybe not in your well (over) fed tank. I would hold off on
cleaning the gravel for a little while. And that's the last time you will ever
here me give that advice! Don>
Greenhouse aquaculture 9/20/04
Hi Anthony, it was a real pleasure to get your reply. Your propagation book
has been an inspiration to me.
<ah, thanks kindly... very good to hear it>
I am really looking forward to a greenhouse. I'm in the early planning stages-
I'm going to take you up on your kind offer and will submit plans at some point
for your thoughts, after the tour of Tropicorium and others-
<I will help any/every way I can>
One question- why would you want to heat the room rather than the water?
<good question... always the air. You'll never see a productive/profitable fish
room/GH run by heating the water... waaaay too expensive. Heat the air, and the
tanks/water act like heat sinks. Very stable>
It isn't that electricity is more expensive than natural gas?
<depends on where you live... varies wildly all over the country. I have seen
electricity from 4 cents to over 30 cents per kw hour>
I would think that heating a large volume to bring the water up to temp would be
very inefficient-I suppose the cost of 10k watt water heaters for each 240
gallon sized receptacle would be prohibitive compared to inexpensive
warehouse-type heaters?
<it is most always best to simply use a hanging furnace to heat the room/air.
You see these everywhere in industrial applications. There's a reason for it
<G>>
Thanks for your help, Anthony- Charles<always welcome.. best of luck/Life.
Anthony>
Breeding Puffer with convicts? 8/18/04
Hi
<Hi, Pufferpunk here>
I was wondering if you could breed a Convict Cichlid with a Puffer fish?
<About as easily as breeding a cat & a dog. Just won't work.>
Also I was wondering if you could breed green Severums with Convict cichlids.
<There has been success interbreeding different species of cichlids together,
but I highly doubt you'd have much success with it.>
Please email me back with the answer Thank you.
<Instead of concerning yourself with breeding, why not try & study up as much as
you can about the fish you have & do the best you can to keep them alive,
healthy & long-lived? ~PP>
Breeding Fish in the Home Aquarium
Thank you Chuck!! Your information has helped me decide on three fish which
I want to breed.<Hi, MikeD here today> The three are the Dwarf Gourami, Egyptian
Mouthbrooder, and
Zebra Danio. Now that I've said it, how would I go about pairing up each
type of fish for breeding<With the exception of the Dwarf Gouramis, the other
two are usually bred in larger groups, with a male and several females for the
Egyptian Mouthbrooder and the reverse for Zebra Danios. And how do I tell the
sexes apart.<Sexing adult fish of all three species is easy, with larger flowing
fins and much more pronounced color being true of the males in all three cases.
With both the gouramis and the cichlids, the females are often almost silver>
After I obtain
one or two pairs of fish what should the breeding tank look like and what
should it contain<I suspect that you may have misunderstood Chuck in relation to
the tank, as each species is easily bred in a 10 gal. tank, but it has to be a
separate tank set up for just that purpose, for each species that you wish to
breed>. I specially would like to know what type of filter is
best for breeding tanks, are they sponge filters<By far the best, as they
actually encourage the development of rotifers, an excellent first food for all
three types of fish> or undergravel? You don't
necessarily have to give all this info yourself maybe give me a couple
helpful links.
<I tried but we're experiencing technical difficulties today and each time I
tried to attach a link the entire post was lost. Using either the Google here or
your regular browser, entering "Breeding Egyptian MouthbrOOders", "spawning
Zebra Danios" and "Spawning the Dwarf Gourami" should bring you back several
easy to understand posting on the subject(s)
Thank you for any more info you give me! Thanks again.<You are very welcome>
Yours Truly,
David Powell
Freshwater breeding
Hi, this is a great site its really help me a lot. I am fairly new to aquariums
(besides bettas in 1 1/2 gal. bowls) and I have been through a lot of stuff in
my first more or less six months. But now I think I've got a pretty good
understanding of things and my tank has been doing great. And eventually I would
like to try and start breeding fish, could you recommend any fish that don't
require a lot of space (10 gal. at most) are easy to breed, and easy to raise
the fry? I know it sounds kind of specific but I want to start out as slow as
possible to avoid any more fish disasters.
< Look at small live bearers such as guppies and platies. They give birth to
live fry and you won't have to worry about eggs hatching. Just keep lots of
floating plants in the tank for the babies to hide in. They will eat the same
food as the adults you just have to break it up into smaller pieces. Keep the
adults well fed are they will eat their babies.-Chuck> Thanks a lot, Mike
Why do they eat their fry
Hi I've been wondering why fish eat their own children is it because they don't
get enough food or is it just because that's just how they are?
< Most fish just spawn and scatter their eggs or release their fry and take no
parental responsibilities for them. In the wild they are too busy surviving on
there own so they see everything edible as food. Some fish like cichlids do take
extra care of their eggs and fry by taking care of them for awhile.>
I haven't got my fish yet but im getting Dalmatian mollies. I got a 10 gallon
tank. Also do they really need salt in there tank? If they do can you just put
regular salt in it or do you have to buy the salt mixture?
< Rock salt is fine. They tend to do better with a little salt in the water. It
helps build up a slime that helps fight diseases.-Chuck>
Im very very curious! Thanks Brittany Lee
Aquatic green house 4/30/04
I am building a green house in southern Mo. and had a few questions. What
plastic will I need to optimize growth.
<growth of what my friend... freshwater plants, pond fishes, marine corals?>
This is all I am getting from the greenhouse sources because I am a welder and
work in the air handling industry.
<hmmm... do know that most plastic coverings for greenhouses inhibit most/all UV
and that is not desirable for aquatics (some UV needed for corals in
particular). The less expensive plastics with t he shortest lifespan are
generally the best for our use as they admit the most UV (which you can finesse
through the year/seasons with shade cloth)>
Also I was thinking of using 60 gallon water barrels (the blue ones) and shaving
off one vertical side and tops and plastic welding these together make a 8' long
2' wide 2' deep vat.
<this sounds like reinventing the wheel... there are many cheap water holding
products if you look around. Agricultural feed troughs, fiberglass liners,
etc.>
Also would you keep 24 vats on one system or 2?
<No idea what you are growing here... cannot say. In general though... keep your
tanks species specific. This likely means having more vats unless you will
specialize in one species/family/group farmed>
I have found a few used protein skimmer skids here and there on the net. thanks.
Steve Schultz
<have you seen/heard of my Book of Coral Propagation? it is 450 pages about
coral farming... in greenhouses. Do consider. Anthony Calfo>
Suggestion for your fantastic website.
Hi Robert, kamusta kayo?
<Well my friend, thank you. Buddha casts his shadow amongst us with your caring
words>
What a fantastic website, an aquarist dream, it just like an Aladdin's cave of
information. I couldn't speak more highly about this website.
<High praise indeed>
I would like to make a suggestion and I hope it would make this website even
more complete for a fish lover like myself. I would like to see one more
topic on AQUACULTURE, perhaps in between Aquatic Business and Aquatic Science.
<Yes, the best placement>
Although my hobby is aquarium, aquaculture play a very important role in my
formative years. Now I live in Australia but I grew up in Indonesia where
aquaculture play a very important roles to improve the peoples diet particularly
in the rural area as a provider of animal protein. My parent have two big
fish pond (so my neighbors) where we grow a table
fish, mainly MUJAIR (Tilapia mozambica), Tawes or Java Barb (Puntius javanicus)
and of course Giant Gourami for that special occasion.
<Ah, yes>
I remembered we went to the market every 4 or 6 months to buy fingerlings from
the fish merchant. I also remembered the farmer stock the rice field with
Tilapia and Cat Fish (Clarias batrachus) during the flooding stage of rice
growing and harvest the fish just before the dry stage of the rice growing. It's
a bonus income for the rice farmers.
<I see>
I believe Aquaculture would play a more and more significant role as a food
source, particularly in the developing countries.
<More and more every year, yes>
When I have more time in my hand, perhaps in the future, I would like to build a
fish pond for an intensive aquaculture. I hope I could find the information that
I need in your fantastic website.
<And I hope you will be able to take a more active role in the production of the
content therein>
Once again thank you very much for a fantastic and informative website.
Salamat Po,
Cheers, Bintoro
<Sama sama, Bob Fenner>
HEY BOB (breeding peacocks German reds (Hormonal Manipulation )
Hey bob
<Herrn Glen>
my name is glen I am just start out a breeding set up for Aul. German Reds .
<Very nice fish/ Kaiserfische!>
I have 14 females 4" and 2 full sized full colored males , and some hap ahli
+ hap moorii to get started.
I want to sell the local pet shops as the pet shops we have here don't have
top quality fish .
pet shop's here mainly have pond raised fish witch are deformed and VERY ugly
(like lelupies that are brown and no longer yellow) .
<Should be destroyed IMO>
all the fish I bought were F1 's and very nicely colored .
ok now that u know what my set up is here is my question .
these Hormonal Manipulation you speak of will induce breeding right ?
how do I get some ? and is it a good idea to give these shots to AUL PEACOCKS?
I don't want to make deformed fish or discolored off spring .
I have 3 females holding eggs at the moment and I have only had the fish for
2 weeks .
please give your input on this thanks for your time bob....
Glen Chenoweth
<It's unnecessary and not-advised to use injection/hormonal manipulation with
these fishes. Aulonocara's are easily bred with just regular maintenance of a
breeding colony (a male, few females) in a large enough system, regular good
feeding, maintenance. If yours are not spawning as yet, I would look into adding
protein to their diet, possibly elevating temperature. Please do look into books
(in German, and English) on this group of fishes. There are some excellent
accounts of their captive care including breeding. Bob Fenner>
Marine water treatment, fish farm in Bali
Hi Bob,
<Hello Charles>
I have read your news forum daily and I must say you are simple amazing like
a walking dictionary in aquaria industry. Thanks for enlightening those like
us who's still figuring out bits and pieces of aquaculture knowledge. I have
indeed gained a lot by just reading your aquaria news in the forum.
Hope to meet you one day.
<Me too>
I'm currently running a marine fish farm and would like to know any
affordable and effective ways to sterilize my system water. Currently I'm
using 2 UV light tubings for 15,000 litre of water in my holding however
one aquarist told me to get commercial grade with multiple UV tubings in
order to be effective. But getting commercial grade UV light tubings prove
to be very expensive. How abt ozonizer for 15,000 litres of water?
<Could be done... seek out the larger Sander's (made in Germany) units. If you
have room, storing the water in the dark for a week or two, possibly bleaching
it (with commercial concentration sodium hypochlorite) THEN dechlorinating it
(likely with thiosulfate) are options as well>
I have tried submerging LR in fiber glass but in less than a week most of
them were dead. DO they need strong sunlight or constant lightings?
<More needed are good protein skimming, water changes when water quality slides
greatly>
What
other
condition do they need in order to survive?
Is it possible to put my posting in more obvious spot as I'm desperate in
finding serious business partner for my uncle Ong Kian Huat in re-activating
his
existing Bali farm?
<Where do you suggest?>
It's such a waste that this farm with 100 tanks sit
lying
there untouched whereas many new investors were trying to start from scratch.
<Agreed. Got to have aquariums, space>
Sorry to email you so many questions as finally I have found a guru which
can satisfy all my curiosities in aquaria matters :-)
Pls advise.
Thank you.
Cheers,
Stephen
<Keep on planning, searching, contemplating your possibilities. Bob Fenner>
Methylene Blue, Formalin effects
dear Bob!
would you please let me know the answer of my following questions:
1- it is mentioned that "Methylene blue" that is a common chemical for
disinfection of fish egg, also has another function ,so that increase the animal
pole of the egg's this correct?
<Yes, a "side-effect">
if is, why the development of animal region of egg is important?
<To enhance development>
2- also, in some reference we read about the use of Formalin (for disinfecting
the culture media) for example 12 or 24 hours before introducing the fish or
rotifer in the culture). what is the reason?
<To reduce the likelihood of microbial, protozoal competition, disease>
does Formalin loss its effect after these times .doesn't it have any danger for
cultured organisms after this time.
<Indeed it does. Depending on many circumstances, BOD, temperature... there
might well be sufficient residue to kill all. I would rinse the containers
thoroughly before using. Bob Fenner>
regards
Reza
Oxygen bleaching agent--Sodium percarbonate manufacturer
Dear Sir
I have your name and address from internet.
I take the liberty to write to you and see if we can establish business
relationship with you.
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used in detergents, oxygen generating agent, water treatment ,dye, textile, pulp
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Wuxi Wanli Chemical Co.,Ltd
Tel:86-510-2696999
Fax:86-510-2695999
Email: wlchem@wlchem.com
Web: http://www.wlchem.com
2003-07-19
<Will post your message on our Business subweb. Bob Fenner, WetWebMedia.com>
Mystery Eggs
Wow I have 6 eggs. I have them in a small fish tank with a heat lamp the temp is
between 80 and 90 I mist it about 3 times a ay to keep some moisture there. The
eggs are in peat moss that I got at the pet store. I'm doing what they said but
I just want to make sure I'm doing this right and how long are they
pregnant for before they lay there eggs
<Nowhere in this email or subject line have you mentioned what kind of eggs you
have. -Steven Pro>
Paper details
Hallo Bob Fenner,
I am a postgraduate student of fish physiology, with a lot of interest in
hormonal manipulation of fish reproduction. I downloaded your paper: "(A Review
of the Literature on) Hormonal Manipulation of Fishes As an Aquaculture
Technique", from the web. For correct citation/quotation, could you please send
to me the details of this publication, i.e. correct names of author(s), year of
publication, journal/book title, volume & serial number, and the page numbers.
Please send also the bibliography.
<Yikes... the Author is me, the date Spring 1977, this was a "position paper"
done for a Hormonal Aspects of Behavior class in college. Considering the
datedness, are you still interested in the bibliography? If so, I do have a copy
I can mail you. Bob Fenner>
Thanks
Dorothy Ogony
Department of Zoology
University of Nairobi
P. O. Box 30197
00100 GPO
Nairobi, KENYA
Pregnant fish?
Hi, <<Hello...>> I was wondering if you could help me. How would I know if
my fish is pregnant. All of the sudden its stomach got big and the others in the
pack look the same as they did before. Please help. Thanks in advance.
<<What type of fish is it? Cheers, J -- >>
Young Fish Hobbyist
Hey I'm 13.... and I need to ask you a question. I want to get some fish and
breed them. I want to breed mollies. Right now, I have two female mollies and
two males and I want to know how long it will take. thanks a lot Tyler
<It should just be a matter of months given the proper environment. Take a look
here http://www.wetwebmedia.com/FWSubWebIndex/poecillidfaqs.htm for additional
Q&A's on the subject. -Steven Pro>
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