interesting science on fish gender and oxygen...

[brewmaster15]

http://www.comcast.net/news/science/index.jsp?cat=SCIENCE&fn=/2006/03/29/356599.html



basically it indicates that oxygen levels in the water may affect the hormones that in turn determine the sex of fish....oxygen starved waters produce more males..

I wonder...we know that discus come from warm water...warm water hold less oxygen than cold water... I wonder if the water temp of discus and oxygen levels affect the sex traits and hormones etc. of discus... also....maybe thats why many have luck with using cooler water to stimulate spawning..


just thinking.

-al

[Ryan]

I read this the other day and was wondering when it would get posted here :) It's a really interesting article. I always knew pH affected the gender ratios of some fish (like kribs), but I never considered temperature.

Ryan

[raglanroad]

Al, I heard of another fish study showing reduced fertility in males under hypoxia conditions, and even temporary hypoxia sometimes had permanent effects.

[Westie]

Yeah, and I read that overpopulization leads to homosexuality.:angel: Woops...:argue:

[Jarrod]

Al...very interesting concept! Now I got something else to think about..lol
Jarrod

[JeffreyRichard]

http://www.comcast.net/news/science/index.jsp?cat=SCIENCE&fn=/2006/03/29/356599.html


....oxygen starved waters produce more males..


-al

So what you're saying is that all males are brain-dead ... hmmm ...Don't tell my wife about this ... she find some way to use this against our gender

[DISCUS USA]

Westie you funny.. lol..

interesting thread non the less.. mind expanding stuff here..

[cobalt]

also bartolie in 1996 indicated that in tilapia higher temp produces more males .
I think that discus breed better in slightly chilled water due to the fact that their breeding season is late winter.
that make fine sense from an evolutinary standpoint , the discus feed their young slime so it is best to breed when best for the parents (winter) and not when best for the fry (summer)

anyway, sadly most women think that men are braind dead until they see a mouse in the house.

[kaceyo]

In many reptiles the sex is determined completely by temperature. Breeders can produce clutches of entirly one sex or the other by controling temp. It would be interesting to experiment with oxygen levels and see if we could affect the percentages of a chosen sex.

Kacey