Losing fry after free-swimming

[drlinden70]

Hi all.
Im a very experienced fish-keeper (Tropheus, Petros, South Americans etc).

Quite mystified here!!!

I have a bunch of very rapidly breeding Lab. Hongi.
I have lost 3 batches in a row, shortly after becoming free-swimming (may just a a touch of egg left) within the tumbler.

Water is good, temperature is good, oxygenation is good and the tumbler is not overly active.

Ideas?

David

[aquabee]

One of our members had an issue with chemicals from the fry tank leaching into the water and killing his fry. Have you used this tank for fry before?


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[SunnyHouTX]

What's your pH David?

[crazy42bmx]

With breeding in my personal experience its best to keep newly hatched fry in the origanal tank water that they were first born into. Moving them may cause deaths as i have noticed at times. But if u grow them out to a certain size you can move to a new tank. Just use the same tank water they were born in and ur good!

[aquabee]

If they made it to free-swimming, I can't see how the water would be an issue... Unless the tumblers are in a different tank than the ones the free-swimming fry are in.


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[drlinden70]

Hi all,

Thanks for the advice.

Water parameters are ph 8. Same water as breeding tank.

This tank has been used as a recovery tank before. I suspect there is a pathogen in the tank.
As i have just lost the final batch, i have emptied the tank and will completely bleach and rinse the tank before reuse.

Real pity. Ive lost about 100 fry in the time i have had the breeding colony. Im getting about 3 batches a week however, so should be back in business shortly.

Cheers all

David

Still a bit of a mystery.

[KhmerStyle]

Hope it turns out well.

[SunnyHouTX]

Happened to me a while back. Had to completely replace the tank to halt the problem.

[aquabee]

Happened to me a while back. Had to completely replace the tank to halt the problem.

Yep. I was referencing your experience in my first post.


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[SunnyHouTX]

I see

[rmalford]

I think this happened to Sunny a while back.

[KhmerStyle]

^^^

[rmalford]

I see

[aquabee]

I see...


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[KhmerStyle]

I see.........