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Blue Jack Dempsey
February 2, 2009
11:08 am
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dunc
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June 7, 2011
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Well, I've had these guys for... a good while now. They just don't seem to be growing!

A while back I had a guy e-mail through the JD profile on the website, asking if anyone knew anything about blue JDs. I told him I personally have 5 of them (my dad killed one when I was on holday /sad.gif" style="vertical-align:middle" emoid=":(" border="0" alt="sad.gif" />) and he asked if I'd had any problems with them not seeming to grow. It didn't appear so at the time but now I have one fish that must be 5" TL and the rest are barely above 3" TL. That's after, hmm, a year?

They seemed to grow pretty quickly to begin with but in the past two or three months they've barely grown at all - I'm feeding them twice a day too...

Could this be a genetic weakness or something? Obviously it doesn't happen to all specimens as I'm sure we've all seen a blue JD at about 8 or 10" TL.

February 2, 2009
12:42 pm
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Mark Duffill
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I think it could well be genetic Dunc, they are either been mass produced for shops which comes with its own complications or a lot of shops are buying in tank bred stock but the problem is a lot of these tank bred fish are produced from fish bought at the same time so there is a good chance of inbreeding.

I saw some in a shop on Saturday that were little over an inch but if you had seen them in a photo with nothing for size reference you would have sworn they were 6"+, they just looked like old fish in miniature /wacko.gif" style="vertical-align:middle" emoid=":wacko:" border="0" alt="wacko.gif" />

February 2, 2009
5:48 pm
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dunc
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Well, in fairness, the smaller fish I have still look like juveniles - they're certainly not "fully formed" as it were. The biggest fish is certainly starting to look like an adult but all of them have had colour changes since I bought them too.

Odd, but interesting.

February 2, 2009
10:37 pm
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Matt
Málaga, Spain
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June 13, 2011
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Could indeed be a sign of genetic weakness but just to be sure what are you feeding them mate and how often are you doing your water changes? I know these don't grow as big as your regular JD but surely 3" is a bit small no?

Cake or death?
February 3, 2009
7:27 pm
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dunc
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I honestly thought I'd stated how much I'd fed them, but when I've looked back, I somehow managed to leave it out... /laugh.gif" style="vertical-align:middle" emoid="Laugh" border="0" alt="laugh.gif" />

I feed them twice a day - usually once on dry and once on a fairly wide variety of frozen foods. There's never any foods left over.

Water changes are once every 7 to 14 days depending on schedule.

February 5, 2009
12:14 pm
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Bigbadbaz
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October 2, 2008
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I have been having problems with small fish, I have 3 angels, two from the same batch, one has grown roughly 4 times the size of the other from the same batch. I have removed the small one to another tank at work to see if it get any bigger.

February 7, 2009
1:48 pm
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dunc
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It's really odd. Might start doing more frequent water changes but every time I've measured the nitrates in the past month they've been minimal.. /blink.gif" style="vertical-align:middle" emoid=":blink:" border="0" alt="blink.gif" />

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