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FAQs about Jacks, Family Carangidae

Related Articles: Jacks

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Selene brevoortii in captivity.

Pilot Fish Requirements     10/5/16
Good evening. I was hoping you could help me figure why I had such poor luck with my first experience with pilot fish.
<Mmm; "the" Pilotfish, Naucrates ductor, is not easily kept for a few reasons... all easy to understand. First this Jack/Carangid, like all members of its family, really suffers for collection, holding and shipping (all are wild-caught)... MANY die before making it to wholesalers. Secondly, the species requirements are rarely met in captivity. They need SPACE, as in huge volumes... hundreds to several hundreds of gallons depending on size (most specimens are smallish, but can grow to more than two feet in length); and CURRENT, high, consistent dissolved oxygen (saturation plus); mimicking their natural open water/pelagic environment>
I have a 300 gallon 8’ tank with plenty of swimming room for a small to medium fish school. My tank is completely serviced monthly with very low bio-load.
Can you please share with me the following:
* Temperature range
<Per Fishbase: http://www.fishbase.org/summary/Naucrates-ductor.html
this animal is subtropical. Temperature in the 70's F is best>
* Salinity requirement
<Perhaps a bit less than natural by a few thousandths... 1.023-24... to aid in DO...>
* Appropriate food
<Meaty, frozen/defrosted, high-quality pelleted.... See the coverage on WWM: http://www.wetwebmedia.com/carangidfaqs.htm
* Anything else I might need to adjust.
<Mmm; well... perhaps your process of acquisition... I would NOT quarantine this fish, family; but dip/bath them (freshwater, perhaps with an adjunct; again gone over on WWM), and summarily place in the main/display. Again, THE real issue in terms of morbidity/mortality here may well be the low initial health of the specimens you're trying>
Thank you for any assistance you can provide me.
Gary B Liska
<A pleasure to serve, share. Bob Fenner>

Juvenile fish identification /Neale       6/27/16
Hello WWM crew,
We are now moored in Ft Pierce FL, where due to wind direction large amounts of Sargassum has come in on the tide. I enjoy going through it finding new and different creatures to see and Learn about. (In another life I must have been either a marine biologist or a fish) I have gotten fairly good at identifying what I come across, using your reference FAQ's and guides, but I am stumped on this fellow. Notice the lighter semi circular mark that bisects him vertically, I am unsure as to whether this is a part of his pattern or a bite that he sustained at some time. I have found no other fish like him in the large amounts of Sargassum looked at.
He was actively hiding, was not in a school nor was he acting aggressively to the other fish in the Sargassum with him. I cannot tell, without putting him under undue stress, if he is a scaled fish, from just looking at him in the holding tank I would say no scales. Also it is hard to see but his tail is forked.
Thank you again for taking the time to help in my identification of this fish. I also have slightly different views if needed.
<The shape is obviously Jack-like... so I'd put money on one of the Carangids, and if pushed, would suggest a juvenile Carangoides bartholomaei. But the western Atlantic is not my speciality; Bob, what say you? Cheers, Neale.>
Juvenile fish identification /RMF

<Kittie; how big is this fish? I've seen it, but can't seem to recall....
another friend on the Net believes this might be a juv. Florida pompano (Trachinotus carolinus)....Am pretty sure it is a Carangid. BobF>
<<YES! To Neale's guess:       6/27/16

Re: Juvenile fish identification      6/27/16
Glad my guess was reasonable. But with fish, you can’t be sure without counting fin spines and gill rakers!
<Ah yes; among other inputs>
There is a Smithsonian marine station at Fort Pierce, open to the public at certain times. Definitely worth getting in touch if you want help ID’ing mystery fish.
Oh, and as Bob indicates, Fishbase is an awesome reference that is very easy to use once you start thinking like a fisheries biologist.
Cheers, Neale
<Cheers, BobF>

Giant Trevally in FW/Brackish Aquaria       6/25/16
Greetings Bob, I really feel you to be an expert in FW/SW aquaria. I'm in a heated debate on another forum in the regard to keeping GT(Giant Trevally) in home aquaria. Given they regularly reach 100lbs and our state record is 190lbs and highly migratory. What are your thoughts on the matter? Thanks
<Well; have seen some Ulua spp. kept in public aquarium size systems; but don't recall seeing adults in anything but straight seawater in the wild.
Need room and high specific gravity water as far as I'm aware. Cheers. Bob Fenner>

Re: Lookdown jacks      10/6/14
Is the lifespan of a lookdown listed on your page? I've looked and cant find any info online either right now.
<You can guess pretty close by looking at the species data on Fishbase.org>
I've read from the book The lifespan of Animals: Volume 5: Colloquia on Ageing By CIBA Foundation Symposium
Average span of lookdown in captivity was 5 yrs. its an old book and im sure things may have change today, but what are your thoughts.
<I'd say longer than this... possibly by twice>
Also remora remora, im looking for age span in tanks? Had one for about 7 yrs that was eating and behaving fine until
One day recently it died. 3ft.
<About right>
A response you said to a reader they need " a six to 8 ft long tank to properly house it in the 2-5 year picture." Is that the expected life range of the fish?
<Providing circumstances that approximate the probable lifespan in captivity. B>
Re: Lookdown losses    10/12/14

Oxygen level is 4ppm.
<Way too low... as I suspected. And likely MUCH lower than this when the temp. was 88F>
Thank you for putting out the feelers for someone to come out. I believe I have found of couple of people in the area. I appreciate you guys.
<Cheers. B>
Re: On site consults; Carangid dis.      10/24/14

Vibrio vulnificus and Vibrio harveyi were found in the lookdowns,
<Common; likely secondary... i.e., not the immediate or ultimate cause>
as well as enlarged livers
<This is telling... from what sorts of biological stress?>
from their necropsy, which is not complete yet.

Lookdown jacks      2/3/14
For a lookdown jack about 10 inches from tail to head, how many silversides, pieces of krill, and squid should one eat if fed once a day.
And is that enough?
<A few depending on sizes; and no>
Should it be fed twice a day.
<Or more frequently... depending on temperature et al.>
I've read you said frequently but would like a physical idea if possible to keep this guy happy.
<Your observation of the fullness of the specimen and its behavior is your best guide. This/these are social species.
Bob Fenner>
Re: Lookdown jacks      2/3/14

Temp is 85-87.
<... too high>
Re: Lookdown jacks       2/3/14
Holy crap, it needs to be 72? Ok, ill adjust that.
<Keep reading! USE WWM>

lookdown issue      2/27/14
Good morning our lookdown seems to have something going on.
<The brownish to reddish area on the chest, mouth? Due to? Physical trauma likely>
Can you identify this and recommend a course of action. We have 3 lookdowns in a 200 gallon tank with other species of fish : rabbit fish, leopard grouper , st majors, squirrel fish and an eel but the tank shares water with another tank that houses 2 bamboo sharks and a lion fish.  Your advice is appreciated thanks. Tina Hamm Imaginarium Ft. Myers Florida
<Likely all three just need more room. Bob Fenner>

RE: lookdown issue      2/27/14
So you do not think this is bacterial ?
<Oh, there is very likely a decomposer at work here... secondary though... Else all others would be similarly mal-affected... Think on this...>
 I correct myself on tank size 350 gal and the other fish are 3 to 4 inches
( not big)
<Still... BobF> 

RE: lookdown issue      2/27/14
So should we quarantine them and treat with MelaFix or  something for bacteria
<... no. B>

Proquatics is serious about lookdowns  1/4/11
> Look what the Matts have been writing up lately:>
> http://www.coralmagazine-us.com/content/flashy-silver-captivebred-lookdowns-coming
Neat! Proaquatix was generating Carangids, including this species before the big hurricanes a few years back... BobF
Chuckling, guessing you didn't catch that mention in the piece - 2003 was what Eric relayed. Said they all went to public aquariums back in the day.
<Did see this Matt, thank you. Dave Gross of the co. at the time told me a bit more... I have/had an interest... did work on hormonal manipulation of mullets (principally Mugil cephalus)>
Sounded like they were down to their last 10 juvies before the new year; if you ask me it sounds like CB lookdowns were a pretty successful venture for them to release in 2010 and they're going to push hard for more in 2011.
<Geez! I do wish there was a way of making "Bonsai'd" Selene... these Jacks like their brethren are really too big and boisterous for almost all hobby systems!>
BTW, Happy New Year Bob!!!!
<And you my friend. B>

Lookdown fish, stkg., sys.   11/4/10
Hi there! I have a 150g AGA Aquarium with a model 4 sump, twin 950 Mag pumps a 25 watt U/V, and an appropriate sized skimmer. My stock consists of a Sailfin, blue, Kole, and Naso Vlamingi tangs. Plus a Queen angel, and zebra Moray. I'd like to add a Lookdown to the tank but am worried about buying just one, being that they are schooling fish... Would it be stressful for him if I just bring one home?
<Hello Jay. Selene vomer is a schooling, subtropical fish with a maximum length of over 40 cm/16 inches. At the very least, it needs an aquaria above 300 gallons, and realistically 500 gallons, to do well, in part
because you don't keep one, you keep three or more. Plus, water temperature needs to be kept around 20-22 C/68-72 F, as befitting a fish that can be found as far north as Maine, USA. Its long thread-like fin extensions make it a prime victim for nippy Tetradontiform fish species like triggers and puffers, and its nervous, schooling behaviour means it won't do well in tanks with territorial or aggressive "top dog" fish like surgeons and angels. They inhabit open water and dislike rocks, and can easily damage themselves on abrasive rockwork should they get alarmed. Finally, they are notoriously fussy feeders. Whilst Selene vomer is a darling of the public aquarium industry, and in fact bred in captivity explicitly for this market, it's value as a home aquarium fish is near to zero and its lifespan under such conditions much reduced. Do read Fishbase as well as the WWM page on carangids generally.
Hope this helps you to draw your own conclusions. Cheers, Neale.>
Re: Lookdown fish  11/4/10
That helped immeasurably! I'll let him stay where he is :)
GREAT information, you guys rule!!
Best Regards,
<Glad to help, and thanks for the kind words. Cheers, Neale.>

Brackish to totally fresh water? 5/14/09
Dear WWM crew,
Hi, i live in Indonesia.
<Ahh! Am on my way next week to Sulawesi>
I have a question, i bought a Caranx spp which is a Giant Trevally and a mangrove jack. As far as i
know, this both fish are a brackish when juvenile and move to saltwater in adult.
When i look at the fish store, they said that this fish are already convert to fresh water and put together with other fresh water fishes. So i bought 7 giant Trevally and 2 mangrove jack about a month ago, i put them in my Koi's pond. Until now they are still alive and eat very greedy with blood worm or frozen shrimp. Their grow bigger now. My question is, will this fish really convert to fresh water, because i just afraid that this fish will dead in certain size if not move to salt water. Thanks.
<These fishes cannot stay in freshwater indefinitely as far as I know... their kidneys will fail in time... Bob Fenner>
Re: Brackish to totally fresh water? 5/14/2009

<<Yes, as Bob says, I doubt that either of these fish will adapt permanently to freshwater conditions. Both will need to be kept in at least strongly brackish conditions (50% seawater, around SG 1.012 at 25 C). In the case of Lutjanus argentimaculatus, it is the juveniles that are brackish water (or freshwater) fish; the adults live offshore, on the deep reef, down to 100 metre depths. That said, Lutjanus argentimaculatus does quite well in strongly brackish water for long periods of time, probably permanently, though their sheer size (above 100 cm) has meant that few specimens have been kept in brackish water aquaria for any length of time.
It is also an extremely aggressive and highly predatory species. Caranx ignobilis is a bit more complicated. Most populations are marine fish as adults, though juveniles are found in estuaries commonly enough. However, there are some populations where adults will enter brackish and even freshwater bodies of water. That said, I'm not aware of any populations that spend their entire life cycle in freshwater habitats. Besides, at up to 170 cm in length and highly predatory as well, even in a pond, these fish surely have limited usefulness. Cheers, Neale.>>
<Thanks much Neale... BobF, even more punctuated in replying...>

Water Pump Info And Threadfin Lookdown/Feeding 2/9/09 Hi everyone at WetWebMedia, <Hello Wilberth> I?ve read your site for the last 4 years and find it very informative, congratulations on your work. <Thank you.> My question is regarding a water pump that I want to buy for my 350 gal FOWLR system, what?s your experience/opinion on hy-drive 2570 supreme pump? It?s 4800 gals/hr. <I have no experience with this particular model, but Supreme does produce quality pumps. I'd post this question on one of the forums, get feedback from folks who are/have been using them.> And lastly, I can?t get my 4 inch lookdown to eat, have try flake, pellets, krill and fresh shrimp, I added him a week ago. other fish are doing just fine, Blue Tang, Dogface Puffer, Spotted Sweetlips, about 12 damsels, one 12 inch Panther Grouper, three 5 inch Yellow Tangs, and one 5 inch Red Emperor Snapper, water parameters also on check. thanks a lot for your time and sorry if the grammar and spelling is not fine. <Not one of the easiest fish to acclimate. You may need to coax with live foods. Another factor may be that this fish is rather timid and should be kept with fish of a similar nature. I'm thinking the puffer is going to alter his fins somewhat in that regard. Keep in mind that these fish are not all that active to begin with, give it some time to acclimate. May want to read here and related FAQ's. http://www.wetwebmedia.com/jacks.htm> Kind regards from Mexico City. <And a good day to you. James (Salty Dog)> Wilberth.

About Lookdowns ... more poor English, RMF nearing the end of daily tolerance... Danger!    7/20/06 I was wondering if they could be kept in a 125 with a blue line trigger?  and if a pair of golden pilot fish could be with  them? <For a while. Please read here: http://www.wetwebmedia.com/jacks.htm and the linked files above. Bob Fenner> Could you tell me how many gallons i would need for all of these  fish? <... read where you were referred to... RMF>

Carangids, poor English  7/23/06 if I upgrade my system to a 300 gallon system can I keep lookdowns and pilotfish? or is this system still too small for pilotfish? <Is, would be okay for a while... Bob Fenner>

Lookdowns (Selene vomer) ... and an Ode to Pygmalion  2/23/06      Hi there  from  Pennsylvania.                                             <Howdy from S. Cal.>                                      I have a 240 Gal. system (2x2x8ft.). Temp. is at 79-80 deg., salinity is 1.017-1.018.     <I'd raise this up to 1.025> Current Livestock;     Clown Grouper, Bird Wrasse, Lunare Wrasse, Yellow Tang, Red Snapper, Coral Beauty, Goldband Clownfish,& (2) sea urchins. All fish are 4-6 inches (as of now!). <... am tired of fixing grammar, punctuation... What is wrong with the U.S.' English?> I will be getting rid of  the lunare wrasse when it gets bigger (hard to catch  because it hides in the live rock.). I am thinking about   getting     (2) lookdowns.   My   questions & concerns   are ;            (1)  Is my tank size large  enough (long term).           <Define long term. This species will grow too large for this sized system>  ( 2) Do they   flip out during water changes & maintenance.         <Not "too" badly>                (3)   Do  they  constantly  swim   fast or do they cruise slowly.     <Mostly the latter... especially compared with some of the Jacks/Carangids offered in the trade>                                                        Any information would be greatly appreciated.                                                            Bill                                                       <Please see WWM re the species, family... and learn to put spaces twixt your sentences, words. Bob Fenner>

Indian Threadfin Question   1/7/06 Hey, I have recently been looking into a fish known as the Indian Threadfin of the jack family. Apparently it should not be paired with "fin-nippers" due to its long thread-like fins. <Yes> I was wondering if a Indian Threadfin would be safe with a eel like a Honey-Comb moray or a Zebra Moray? <Should be, yes> Also if it can, what should I feed it and put in the tank to make it comfortable. <Most any slow-sinking meaty foods it recognizes... best to train (slowly) by adding bits that will float down near its face... Do you have a large system? Keeping more than one is recommended. Bob Fenner>

Lookdown fish?  11/10/05 I have heard that no medication should be run with the lookdown fish. Is this true? <Mmm, not particularly. These Jacks (family Carangidae) are not particularly sensitive...> I currently have one in a tank that has copper running about .5 ppm and he seems to be fine all except for some light white patches. Is there a medication that you would think is safe for this fish. thank you Tim <Half a ppm of free cupric ion is getting dangerous period. I would keep this at no more than 0.35 ppm. Bob Fenner> 

Lookdown possibly sick  9/23/05 Hi all,   Great site! My tank looks a lot better now after I've followed some of your advice. However, I have a question regarding a juvenile lookdown in my tank. I got it about a month ago and it doesn't seem to be doing too well even though the other lookdowns are getting along great. This one seems to be sick, I'm not sure. I've been reading about the diseases on your website but I can't really find one that relates to all these symptoms. The lookdown seems to have a cloudy haze to his left eye. <If on only one side, likely a mechanical injury...> The yellow stripes on his body <... May be another Jack species...> have also faded and replaced by what seems like dark splotches. He is also lethargic and not eating as much as the other two lookdowns. I've tried looking up the particular cause of these problems but it seems that each symptom is representative of a different infection. I would really appreciate any help you could provide. Thanks a lot in advance! -Rush <... sounds environmental, social... Please re on WWM re the Lutjanidae. Bob Fenner> Impulse buy Hello, <Hi there> I have done something extremely stupid and would like your advice. I recently bought a small yellow and black striped fish which was listed as a yellow and black Carnax. Obviously not researching my purchase was a big mistake but the wife and kids fell in love with it and you know the rest.  Any way I was told that this fish was almost full grown at about 2 inches. After adding this fish to my 260 gallon tank I did some research and could not find any information on this fish, what I did find was a picture that looked very much like this fish. It was a juvenile Golden Trevally. This is what I would like to know, is a "yellow and black Carnax" another name for a Golden Trevally? <I do think this is so... likely the name is actually "Caranx", a large genus of the Jack family Carangidae. You can look up many of this family's members (with pix) on fishbase.org... some get exceedingly large! Quick! Bob Fenner>

What kind of a tank for a Lookdown Hello, I recently saw a lookdown fish at the local pet store in my neighborhood. I have a 150 gallon saltwater tank. I have a porcupine puffer, eel, trigger, panther grouper, yellow tam, sea urchins. Can you tell me if it would be ok to add a lookdown fish? << I believe so.  Sounds like the right type of tank for a look down. >> Thanks for your help. Lisa Riley <<  Blundell  >>

A question regarding a lookdown Hello Crew, Big Fan! <Me too!> I had a question regarding a lookdown. I bought him a week ago. He is approx 6 inches and only eats live foods. At the store as well as in my tank he will not touch anything but live Rosies. Is it possible to get him eating frozen? <Yes... Jacks/carangids in general are VERY eager eaters of most all (familiar) foodstuffs...> If so how does one go about getting the fish to convert? <Best just to grade into novel foods... mix some in with those currently being used...> Lastly, he is getting mildly harassed (just being chased not nipped) by my passer angelfish who is approx 6-7 inches. Do you think this harassment will continue in the long-term? Thanks, Dan Vollenweider <If the system is large enough, no... a few hundred gallons should allow both specimens to coexist. Bob Fenner>

- Lookdowns - I have a question regarding lookdown fish, and can't seem to find much information.  I am a hobbyist with better than 15 years of saltwater experience (current tank 180 gallons).  I am about to upgrade to 670 gallons (10L x 4w x 2 1/2T).  I would very much like to have a pair of lookdown fish.  My current supplier (been a very good source of quality fish) can get them from the Caribbean. Says those they have gotten in the past have done real well.  In general I trust their opinion, but I tend to do my own research when investing in something like this.  I just cant find any conclusive information. My question is whether these will do well in my new tank.  I don't want to waste my time if they will only live a short period of time. <Nah... think that in general these are pretty hardy fish and should do well for a good long time.> My current tank I run at approx 78 degrees.  Would this be too warm. <Don't think so.> My assumption is that if from the Caribbean, it should be okay.  But I did see an FAQ article suggesting potential need for chillers. <Do believe your hunch about those coming from the Caribbean being the best selection.> Thank you for your time. <Cheers, J -- >

Lookdowns... temperate and big tanks 3/23/03 Hi, my names George. <cheers, my friend> I live in London (UK), <heehee... and thanks to the UK for that TV show "Ground Force" (gardening show). Seriously... I just love it for some reason :) We get it on BBC America> I'm currently researching into my new marine aquarium, I've come to the conclusion that it will be 48x30x24 approx 120 gallons, <that's a fantastic sized tank for rockscaping> I'm just playing with the idea and would much appreciate your expert opinion, would i be able to keep a Lookdown in my tank? <alas no, my friend. Many problems here. They barely occur in tropical waters... many more are in temperate waters. A chiller is required for long-term success with most of them. Furthermore... they are large fish that require enormously long and large aquaria to swim in. Most die in home aquaria within a year or two. They fare better in large cylindrical aquariums (over 500 gallons).> I plan to have around 80lbs of live rock built around the edges kinda like a wall, with a 1-2 inch live sand bed, skimmers I've yet to choose so excuse my newbyness, lol. <no worries at all... you likely have good access to the Tunze line in the UK. I rank them in the top 5 personally> bearing in mind the majority of the tank will be open water, could i keep a lookdown? <your planning has indeed been thoughtful... but this is just not a fish for home aquaria... some say public aquariums only (large size, circular tanks, chillers and a big budget to support them... Ha!)> if so is there any compatible fish (the lookdown looks very delicate). <very few... most will nip their long pennants or simply startle these easily frightened fish into a wall.. ouch.> also what do they feed on, <actually predatory... live fish (which embraces another challenge for long-term success). FW goldfish and feeders are nutritively deficient for SW species... so a feeder tank with thoughtfully gut-loaded prey (feeding prey nutritively dense dry or frozen meaty foods) is required> sounds crazy please say so, I want to provide a perfect setting and environment for my fish so your advice and criticism would be much appreciated. Sincerely George Emeny :-) <I certainly can empathize with your admiration for this unique fish! Alas... most of us need to be content to view them in the public aquarium and resist bringing them home. If you would still like to consider keeping one, I would be delighted to help you work it out. First seek the availability/viability of a larger display (300-500 gallon minimum) and a chiller, then follow up with us to share opinions on filtration and feeding. With kind regards, Anthony>

Lookdowns. maybe not Thanks Anthony for the quick reply. <always welcome my friend :)> I like Ground Force too, but personally i would just scrap the garden and install a swimming pool sized pond, stock it with sturgeon (ok, i am crazy, lol) <mmmm.... sturgeon <G>. Anyway back to the subject in hand, apart from Lookdowns, i was also thinking about a predator themed tank, same dimensions (48x30x24) <many possibilities here indeed> I was in my LFS during the week and i spotted a large spiny puffer, he looked so cute, he was at least 12 inches long, <and they do get bigger... some serious concern here for the adult size of this species. Perhaps you can find a smaller puffer species that appeals to you> if I based the aquarium around him <heehee... would have to> (listen to me already referring to the puffer as "him", lol) what sort of other fish could i introduce, I've read on your fantastic site that they can be quite nippy, <very much so... like triggers> and with a 1 foot specimen, I dread to think the damage he could do to more mild mannered inhabitants, would a Volitans work? or perhaps a trigger? <in a bigger tank, either could be fine... the lion is a better choice overall> Or would it just be a bad idea in general? <our problem here is that the adult size of these fishes exceeds the practical (if not ethical) limit of a 120 gallon aquarium. The aquarium is not quite three times their length. Instead, a dogface puffer and a dwarf lion (some dwarf species still reach 25-30cm!) would likely be a better choice. Better still would be an ell mate for the puffer. Eels generally eat less and are less of a burden on the bio-load. May be necessary here? As you no doubt understand stocking is so difficult, with such an amazing array of fish, I've got to get it right first time u know, considering how much it will cost me, i don't want corpses, lol. <very much agreed... and do look up your candidates adult sizes as you shop. One of the most complete sites for species surveys is fishbase.org   a search for spiny puffers there (Diodon holocanthus) reveals that can reach an adult size of 50 cm! Anything near that just doesn't seem possible in a 120 gallon I'm afraid. See more here: http://www.fishbase.org/Summary/SpeciesSummary.cfm?genusname=Diodon&speciesname=holocanthus  > I mean am looking for a selection of say 3-4 show fish, that would get on with a minimum of aggression. What would you stock ? <3-4 predators in a 120 will a little tough, but still possible. A fine mix might include a Niger Odonus trigger (there are some magnificent specimens with purple, teal or green bodies sheens), a snowflake moray eel (one of the smaller of the handsome species), a small Arothron nigropunctatus puffer (many color varieties here) and perhaps a Fu-Manchu lion (very colorful and slow growing)> I trust your amazing knowledge to help a newbie, lol. Thanks again Anthony. :-) <thanks kindly, my friend. Anthony>

Gold Trevally Hi Bob, Just came across a Gold Trevally at my local petstore. I've seen these on sale at FFExpress but they are on the restricted listings. I've been really interested in them. This one which was still in the shipping bag when I bought it eats like crazy and seemed to acclimate quickly. <Yes... a "darling" of the public aquariums worldwide currently... very fast growers, continuous movers, good-looking...> Now today I've noticed it hanging and I mean really hanging with my true Percula clowns, it's quite comical and I have never quite seen anything like this before. It will stay almost attached to these fish, it does the same to the other Percula in the tank, just goes back and forth from one and then to the other. If the clown swims right this little pilot mimics every move staying right on top of them. My question now, should I buy a few more from FFEXPRESS in case it needs other gold Trevallys to school with? <How big a system do you have...> Or if I don't will it perish or harm my clown fish in anyway? Thanks for any information you may have. Mark <Please read here: http://www.wetwebmedia.com/jacks.htm and beyond. Bob Fenner>

Source of Selene   I live in Milton, Massachusetts and am trying to find a source anywhere in the U.S. that can get lookdown fish (Selene vomer) for me. Any help would be greatly appreciated. Thanks in advance. Sincerely, Gregory Cruse <Most all marine livestock import/wholesalers handle this Jack species nowadays... Do look over the etailers listed on the Links pages on our website: www.WetWebMedia.com for some who certainly will. Bob Fenner>

( re, umm, same... ) Lookdown fish Please Bob, tell me what you can about these wonderful fish. Care and where I can get them. In particular Selene vomer. I'm no computer wiz, but I have tried all I can to get info and locate a supplier. I noticed in FFExpress's restricted fish list that they are difficult to keep. Can you tell me all you can about them? Thanks Bob. You are my last hope at this time. Most sincerely, Gregory Cruse <Hmm, have answered you on their 911 service... and have coverage of this and other popular Jacks (family Carangidae) posted on our website: www.WetWebMedia.com with images... Please see the site and the livestock etailers listed there. Bob Fenner>

Lookdowns, Jacks, WWM a petstore I went to had three of the look downs they got from sea world and have been doing good for a month. I also so them a couple months ago at another store. so you think they aren't worth the risk of buying then? they both wanted $100-$120 for them. <Read over the section, FAQs on the Jacks (family Carangidae) posted on the site: www.WetWebMedia.com under the Marine Index (because this is what/where my information on these fishes are/is) Bob Fenner>

Golden Trevally Hi Bob, I have four questions for you. <Yowzah!> One is If I get 1" golden Trevallys (probably 5) how much can I keep them before they get more than 3" long?, <Gnathodon speciosus... this Jack (family Carangidae) has become a "darling" of the public aquarium biz... and for good reasons... they're gorgeous (golden with dark stripes) as juveniles to adults, very active/spectacular swimmers/schoolers, hardy once stabilized... all in all eye-catching and intriguing (I suspect they work for Fuji, Kodak...). But they do get way big (more than a meter/yard in length, and can grow VERY fast... I suspect that yours will exceed three inches in so many months... Do put on the most filtration, circulation, aeration that you can...> I just love this fishes and the way they school green Chromis aren't that nice, and don't really school... more like gather); but I've seen some that are just huge... <Yes me too, and they're tasty to eat to boot!> The second question is What do you think of the book Reef Fishes Vol 1 by Scott Michael? <It's excellent. A very high standard in content, production. Very nice image work, ready, useful natural history and husbandry notes... The only exceptions I take with it are organizational... I would have made the first volume the more/most commonly kept/available families/species... and the other following volumes survey works (true eels to tetraodontiforms...)The next volume should be out early this next year.> The third is If I get a very small Monocentris japonicus ( no more than 3")Can I keep him with shrimp/clams/sponges?... (in a 120 gal 4x2x2 reef) and maybe hope he won't start feeding on them when he starts growing? <This Pineconefish (relative to other beryciforms like Squirrelfishes, Soldierfishes...) will definitely be eating any/all shrimp it can... the other life should be fine> And the last question is what do you think of the "Black Powder" product made by Marc Weiss?, I've read it is very good and want to give it a try to keep blue sponges, and help the health of my sea squirts... <Don't know about this product at all... haven't read many reviews, anecdotes of others using it...> Thanks a lot. I read your Q/A almost every day. Norberto. <Glad to hear it's of interest, use. Bob Fenner>

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