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FAQs about Giant Clam
Reproduction
Related Articles:
Got Tridacna? A beginner's guide to keeping Tridacnid clams
by
Laurie Smith,
Example Chapter from
NMA Reef Invertebrates book, on Giant Clams, Tridacnids,
A Brief
Guide to the Selection and Placement of Tridacnid Clams by Barry Neigut,
Bivalves,
Mollusks,
Lighting Marine Invertebrates,
Related FAQs: Tridacnid Identification,
Tridacnid Selection, Tridacnid
Compatibility, Tridacnid Systems, Tridacnid
Lighting, Tridacnid Placement, Tridacnid
Feeding, Tridacnid Disease, Tridacnids
1, Tridacnids 2, Tridacnids
3, Tridacnids 4, Tridacnid Clam Business, Bivalves,
Bivalves 2,
Lighting
Marine Invertebrates,
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9" T. derasa spawn
7/22/08
Hi Bob,
Writing to you a second time today to show you a pic of my 9" T. derasa
in my 125 show tank in my store who clearly is spawning and has been for
the past half hour! I've attached a pic for you and if you have a
moment, I'd be grateful if you'd care to opine. I just did a water
change on the tank and added an additional powerhead, but nothing else
has changed in the system. I've had him for about a year or so, but I've
never witnessed a spawn. Below is an excerpt from an article I reviewed
regarding spawning in T. derasa and also gigas. The reference to the
timing of the event is right in line with what my derasa is doing. (I
hope there is no issue taken with sending you this writing as it is
merely for reference to the event occurring in my show tank and is not
intended for use for any other purpose.)
Title:
Reproduction in the giant clams Tridacna gigas and T. derasa in situ on
the north-central Great Barrier Reef, Australia, and Papua New Guinea
Authors:
Braley, Richard D.
Affiliation:
AA (School of Zoology, University of New South Wales)
Publication:
Coral Reefs, Volume 3, Issue 4, pp.221-227
Publication Date:
12/1984
Origin:
SPRINGER
Abstract Copyright:
(c) 1984: Springer-Verlag
DOI:
10.1007/BF00288258
Bibliographic Code:
1984CorRe...3..221B
Abstract Small groups of T. gigas and a single individual of T. derasa
have been observed to spawn sperm in nature during the austral summer on
the Great Barrier Reef. In T. gigas diel periodicity to the spawning
generally coincided with incoming tides near second (full), third and
fourth (new) quarters of the moon phase. Intense spawning ranged from 30
min to 2 1/2 h, with spawning contractions occurring every 2 3 min. Eggs
were never observed being spawned in nature. A new technique, an egg
catching device, was used for sampling eggs of T. gigas which were
observed spawning sperm. Results indicated that the egg phase of
spawning did not follow spawning of sperm. Some clams which do not
respond to a spawning neighbour may be reproductively inactive. In 70%
of observations of nearest spawning neighbours the clams were within 9 m
of one another. A hypodermic extraction technique was used for clam
gonadal material. Examination of tissue suggested a potential early to
mid-austral summer spawning for T. gigas, and to a lesser degree for T.
derasa.
Your thoughts would be appreciated. No doubt water changes are imminent.
Would you suggest waiting for the conclusion of the spawn?
Many thanks Bob.
Peggy, www.all-reef.com
<Neat! BobF> |
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Re: Squamosa Spawn and Coral Bleach = Clam and Cocktail Sauce? 5/22/07
<Hi MJ, Mich here again.>
Now in all seriousness, what is the outlook for these very large clams.
<Alright I kind of figured you might have a "real" question but the other was a
lot of fun!>
Will future spawnings be likely?
<Spawning can occur spontaneously, but spawning can also be induced by
drastically changing the environment, perhaps the new environment, i.e. your
system, triggered your recent arrival to spawn.>
Will more coral bleachings be likely?
<Less likely if the environment remains stable. Clams can be induced to spawn
by mechanical manipulation, by increasing water temperature (to 33C or over 90
F) and by environment stress... sort of a last ditch effort for
survival/reproduction. More here and related links in blue:
http://www.wetwebmedia.com/tridacreprofaqs.htm>
Do you think that it is likely this spawning is the cause of the coral
bleaching?
<I'm not sure, but I guess it is possible the reproductive material could
negatively impact life in such a small-enclosed system (at least when compared
to the ocean).>
They happened very closely together in a closely monitored tank. Why were other
organisms not affected?
<Possibly a matter of geography, or just particular sensitivity or maybe the two
occurrences were unrelated.>
Mr. Fenner? Anthony?
Help......
<Will try.>
Thanks
<Welcome! Mich>
MJ
Tridacna clams... aquaculture 12/16/06
Hi Bob,
I am trying to breed Tridacna clams in my farm in Vietnam. Do you help me the
Tridacna clam's breeding process, or where I can have it.
Best Regard,
Trung
<Mmm, there are "standard works" in this field... Look for the names Gerald
Heslinga, James Fatherree... and folks who will travel/consult with you on site
re... do you intend to make this an intensive (on land) operation, or more
extensive... growing out your stock in the sea? If you'd like, we can discuss
various aspects of this process here... through a course of emails. Bob Fenner>
Re: Tridacna clams 12/19/06
Hi Bob,
<Trung>
I need to know what kind to feed larva of Tridacna.
I have been used phyto to feed them.
<What species? How administered? Do you add fertilizer (organic, inorganic) to
their water... is this in "raceway" culture...? How open?>
Do you tell me how to titillate the clam and how to fertilize the eggs.
Best Regards,
Trung
<... This is covered in works by Gerald Heslinga and James Fatherree you've been
referred to... many people develop/use a "kit" to collect gametes... stress
their broodstock to release such using physical "stress", chemical prep.s... Bob
Fenner>
Re: Tridacna clams 12/20/06
Yes, we used heat stress to titillate spawning for clam.
Best Regards,
Trung
<Heeeeee! Like your wording here! Does work... in the west, sometimes referred
to as getting (or giving I guess) "the hots". Hee heeeeee! BobF>
Stress induced spawning in clams?
Moved my maxima to another tank today, it doesn't seemed to have liked the move, and seems to emitting a milky "smoke" from it's excurrent siphon. Stress induced spawning? Expelling algae?
> I didn't remove it from the rock, just moved the entire rock...it's gaping pretty badly, but still responding to light and such as quickly as it did.
> Worried :\
> Anyone have any input? Thanks
yes... quite possibly stress induced spawning (sperm
from immature clam... egg production/capability doesn't occur until they are much older/larger).
You may have heard that stress is commonly used (or
was) to induce spawning by Tridacnid farmers.
Breeders would be moved to warm shallow lagoons near
the time of a full moon. To harvest gametes the
breeders sometimes are brought ashore in the sun to
"bake" for a while, then immersed in fresh, cool
seawater some minutes/hours later. (the farmers often
hedge their bets too by injecting serotonin).
I had a similar stress induced spawning occur in my
GH with some big Squamosas (see the Tridacnid section
of BOCP1 if interested).
Ant- (who can't resist answering mail even while in KY
state <G>)
Looking for Tridacna Clams-or seeds
Hello Bob, my name is Michael from Miko-Marine in Berlin, we're an importer
for
corals and
inverts in Germany. I've got one question: Can you tell me some sources or
Tridacna farms in the pacific ocean where I can order Tridacna-clams or
Tridacna seeds who can export to Europe?
<Can help direct you to folks who might be able to help you. Gerald Heslinga of
Indo-Pacific Sea Farms (http://www.ipsf.com/)
and Barry Neigut of Clamsdirect.com (I've cc'ed him here, see above) should know
where to look next. Good luck, life. Bob Fenner>
Thanks and best regards
Michael
Miko-Marine
Pannwitzstr.79a
D-13403 Berlin
- Germany -
tel. 0049 176 26098337
fax. 0049 30 40912406
e-mail: Miko-Marine@gmx.de
Raising Tridacnid Clams spawning in captivity - 2/12/04
I have just had a spawning of 3 clams in my tank and wanted to know if it is
possible to raise T. clams in and home setting. <Not unheard of but, likely a
very challenging and expensive endeavour.> If so how? <Well, you might
want to look through the knowledge already written on the subject and come up
with a plan.> I can't seem to find any info. <Daniel Knop's book is a
great source for info to start. Here are some web links: http://aquanic.org/publicat/usda_rac/efs/ctsa/130.pdf
http://www.animalnetwork.com/fish2/aqfm/1998/aug/shell/default.asp
http://www.ctsa.org/PublicationList.aspx
http://www.ctsa.org/upload/publication/CTSA_143631672855187292852.pdf
These links of course, are just a start. You might want to get in touch with
those in the know and introduce yourself as one who is interested in the
research. Might glean some very important knowledge. I hear this is a
competitive, expensive, frustrating trade to get into. I wish you luck and let
us know what else we can do to assist. ~Paul>
thanks Brett Lind
Clams
Hello my name is Christopher I would like to know were I could find
information on breeding Tridacnid clams thanks for your help
<A few places on the net. Try the Breeder's Registry first. Link can be found on
WWM: http://www.wetwebmedia.com/links.htm
Bob Fenner>
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