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Does temp affect fry sex?


MarkLB

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Hi all,

I just thought I would throw this out there for discussion.

I have read that the temperature of the breeding tank can affect the eggs of some Apistogrammas and determine whether the fry are predominantly Male of Female.

I have had two batchs of Melanochromis Johanni cichlids and the first batch was around a 50/50 mix but the second batch , bred in a slightly higher temp, seems to be mostly Male 70/30.

What are your experiences in this? With cichlids or any other fish.

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Yes, with Apistogramma's the temp does affect the sex ratio. At about 26*C the fry are usually 50/50 male/female. If the temp is raised to about 29*C the ratio swings to about 90/10 male/female and vise versa if the temp is lowered. I don't know what it is that does it, but it's quite amazing.

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