Do Environmental Factors Influence the Sex of Fry? - Aquarium Advice

Darb21 · 07-15-2008, 01:05 PM

So we've got some Endler's that are breeding (like thats tough

)... and we're getting about 15 females for every male. Are there any environmental factors (Temp, PH, GH, KH, etc.) that could have an impact on the sex of the fry? Any tips to get more males?

Thanks!
-Brad

rkilling1 · 07-15-2008, 06:03 PM

Look up Thermolabile sex determination and see if that helps.

kimo · 07-15-2008, 07:25 PM

When they are born Endlers (sub-species of guppies) appear to all be females. After 10-30 days the gonopodium will form, allowing you to determine male from female.

pH can have an effect on the sex of fry.

Presence of predators can have an effect on the number of fry that are born in a single drop. Usually seen only in the wild.

bs6749 · 07-19-2008, 10:21 AM

As stated, pH can have an effect on the sex ratios during development as can temperature. I'm not sure if hardness can determine sex but it has been shown that hard water can cause sterility in some species such as cardinal tetras (wilds) that require soft and acidic water.

Darb21 · 07-19-2008, 01:05 PM

My Temp is about 77 and PH is at 8.2 naturally, but am injecting CO2, so it stays around 7.2 via my controller... any ideas what changes I should make to get more males?

-TIA!

07-15-2008, 01:05 PM	#1
Darb21 Aquarium Advice Apprentice Join Date: Mar 2006 Posts: 48	Do Environmental Factors Influence the Sex of Fry? So we've got some Endler's that are breeding (like thats tough )... and we're getting about 15 females for every male. Are there any environmental factors (Temp, PH, GH, KH, etc.) that could have an impact on the sex of the fry? Any tips to get more males? Thanks! -Brad

07-15-2008, 06:03 PM	#2
rkilling1 Aquarium Advice Addict Community Mentor Join Date: Dec 2005 Location: NE ohio Posts: 1,763 Images: 50	Look up Thermolabile sex determination and see if that helps. __________________ My 75 Gallon Planted Aquarium

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07-15-2008, 07:25 PM	#3
kimo Aquarium Advice Freak Join Date: Jan 2005 Location: Arlington TX Posts: 221	When they are born Endlers (sub-species of guppies) appear to all be females. After 10-30 days the gonopodium will form, allowing you to determine male from female. pH can have an effect on the sex of fry. Presence of predators can have an effect on the number of fry that are born in a single drop. Usually seen only in the wild.

07-19-2008, 10:21 AM	#4
bs6749 Aquarium Advice Addict Join Date: Jun 2006 Location: Lawton, MI Posts: 1,298	As stated, pH can have an effect on the sex ratios during development as can temperature. I'm not sure if hardness can determine sex but it has been shown that hard water can cause sterility in some species such as cardinal tetras (wilds) that require soft and acidic water.

07-19-2008, 01:05 PM	#5
Darb21 Aquarium Advice Apprentice Join Date: Mar 2006 Posts: 48	My Temp is about 77 and PH is at 8.2 naturally, but am injecting CO2, so it stays around 7.2 via my controller... any ideas what changes I should make to get more males? -TIA!