Does temp. affect sex of baby guppies?

[flyingfish]

Does water temperature determine the sex of baby guppies? My Dad suggested this to me, I thought it sounded crazy, but my last two batches of babies seem to be completely female. My tank is staying around 79 lately. My second batch is only about 1 1/2 weeks old, so it may be too early to tell, but I really think they are all female. I woulv'e been happy if all but one was male. Plus that means I'm down to one male in a 15 gal tank of 10-12 fish(I'm not sure how many of the little ones there are since they hide well). My tank is planted with Cabomba and Amazon Sword. I have soft water (around 6.1 - I know it's low). 1/3 water changes once a week. I have an Eclipse Hood with the charcoal cartridges - although I actually use a large and a small cartridge at the same time and I only change the cartridge when it degrades. I rinse out one of the cartridges when I do water changes. Any ideas?

 

[OrionGirl]

pH can determine gender in some species of killie fish--I'm not sure if temp would affect livebearers, but it's possible. Temperature does dictate gender in some reptiles. I'd give the latest batch a bit more time to develop before counting the boys out of the game, though.

 

[SnakeIce]

there is more than one factor that deturmines the gender of guppies. some males have more factors for male and develop precociously or early and stay small runts, other males have few factors and are late bloomers and are the largest of specimens.

both genders are this way in that there are multiple factors that deturmine the rate of development.

a late male mated with an early female will result in mostly females and an early precociously developed male mated with a late developing female will result in mostly males.

now that is the extremes and there are some that are inbetween, neither late nor early developing, but that could be a factor in the gender ratios you are getting.

 

[flyingfish]

Thank you, I guess I'll just have to wait and see. I don't know anything about where/how my fish were bred so I guess it's "potluck". At least my plants are growing the way I want them to - hopefully my fish population will end up more balanced. Right now I have one VERY happy male fish.