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A 13:09 19/04/00 -0600, vous avez écrit :
> Fish-sci list members:
>
> We are attempting to study the effects of various chemicals on
> bluegill survival to approximately 20 days post hatch. However, we
> are experiencing near 100% mortality (in controls) at about 11 days
> after hatch (25C). Mortality seems to be due to lack of swim bladder
> inflation and switch from endogenous to exogenous nutrition (we are
> feeding marine rotifers). We have tried and are continuing to try
> various things to improve the situation but so far, no luck. Do any
> of you have procedures that might get us at least 50% control
> survival? Any suggestions/insight would be greatly appreciated.
>
> Thank you in advance.
>
> Diana Papoulias
Hello,
more info on your rearing conditions and setup might help us in
understanding what is going wrong.
Anyway, in sea bass and sea bream larval rearing, mortality due to swim
bladder malfunction (lack of inflation) was significantly reduced by
removing from the surface of the water in the rearing tanks, the oil film
introduced by the feeding (rotifers or artemia).
Hope it helps
cheers
ps: By the way, can you see any preys (rotifers) in the intestin of the
larvae?
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