MarkLB Posted January 23, 2007 Report Share Posted January 23, 2007 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. Quote Link to comment Share on other sites More sharing options...
antwan Posted January 24, 2007 Report Share Posted January 24, 2007 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. Quote Link to comment Share on other sites More sharing options...
herefishiefishie Posted January 30, 2007 Report Share Posted January 30, 2007 With African Cichlids, ph can have an influence on some species too. Frenchy Quote Link to comment Share on other sites More sharing options...
Johannes Visser Posted February 4, 2007 Report Share Posted February 4, 2007 http://www.talkorigins.org/faqs/evoluti ... sex-ratios Interesting read if you have a minute. Quote Link to comment Share on other sites More sharing options...
shelzie Posted February 6, 2007 Report Share Posted February 6, 2007 was very interesting Quote Link to comment Share on other sites More sharing options...
MarkLB Posted February 6, 2007 Author Report Share Posted February 6, 2007 I agree. Very interesting. Cheers Johannes Quote Link to comment Share on other sites More sharing options...
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