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Originally Posted by Mak
Hey Sam, I just came across this thread. Regarding your Mysid shrimp population, I really doubt it was the salt mix. I had almost positively no Mysids in my 77g, so I sucked up 9 or 10 of them from my 57g system and added them to the refugium of the 77g. When I took down the fuge before moving (which was about two months after putting in the Mysids), the population has literally BOOMED in there. I think your Mysid boom was just a coincidence. Oh yeah I use IO of course.
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Hi Mak.
But the point you made was that it boomed in your refugium and not in the main tank. This is perfectly reasonable. When they are safe from predators, even with a lower larvae survival rate, the refugium could allow large populations to quickly establish in a short amount of time.
Now, the problem I could have had in my main tank was that the larvae survival rate in IO was just good enough such that only a few of them could survive predation and thus I seldomly saw any in the tank. Once the larvae survival rate increased, more of them existed and predation could not keep up with them which is why I see them swimming everywhere now. I don't have a sump or refugium so larvae survival rate plays a much bigger role. With a refugium, even 1% survival could result in large populations rather quickly I'd imagine.
WRT spawning under stress. I don't doubt that it could happen. But I'm a believer that more often than not, animals require ideal conditions to spawn. But I can see how it may be hard to think that a tank can go to breeding condition after 8 hours of a water change.