Another Guppy Fry Sexing Thread

Betta splendens · 12-30-2006, 01:36 PM

I have these fry (duh), and some already have colored tailfins. I know some guppy females have colored fins aswell, but any other way I can tell? The male breeding organ (the gonodium or whatexer it's called) isn't clear, unless they're all females but I doubt that.

This next question goes for all livebarers: Are they born with male breeding organs or do the males devolope them when they sexually mature?

Thnx

T4987 · 12-30-2006, 03:45 PM

I think I've read somewhere that they are all born with female sex organs then they change later if they are male.

mousey · 01-07-2007, 02:30 PM

The gender of the fish I believe is male or female when they are born but the male organ does not develop into the male shape until he is mature enough.
that said there is an interesting thing that happens if there are no males in a colony of female livebearers. One will develop a male organ fronm the female anal fin but the fish is sterile.

And yes you can have batches of fry where they are all one gender or another.
I have a feeling it has to do with water temperature. i have had many batches of fry that are all the same and then some where they are well mixed.

Betta splendens · 01-08-2007, 08:45 AM

Well animals changing sex does happen with many species, but don't you think it's pointless for the male to be sterile? lol

12-30-2006, 01:36 PM	#1
Betta splendens The frog guy. Join Date: Nov 2006 Age: 16 Posts: 84	Another Guppy Fry Sexing Thread I have these fry (duh), and some already have colored tailfins. I know some guppy females have colored fins aswell, but any other way I can tell? The male breeding organ (the gonodium or whatexer it's called) isn't clear, unless they're all females but I doubt that. This next question goes for all livebarers: Are they born with male breeding organs or do the males devolope them when they sexually mature? Thnx

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12-30-2006, 03:45 PM	#2
T4987 Member Join Date: Nov 2006 Age: 21 Posts: 68	I think I've read somewhere that they are all born with female sex organs then they change later if they are male.

01-07-2007, 02:30 PM	#3
mousey Senior Member Join Date: Jan 2005 Posts: 799	The gender of the fish I believe is male or female when they are born but the male organ does not develop into the male shape until he is mature enough. that said there is an interesting thing that happens if there are no males in a colony of female livebearers. One will develop a male organ fronm the female anal fin but the fish is sterile. And yes you can have batches of fry where they are all one gender or another. I have a feeling it has to do with water temperature. i have had many batches of fry that are all the same and then some where they are well mixed.

01-08-2007, 08:45 AM	#4
Betta splendens The frog guy. Join Date: Nov 2006 Age: 16 Posts: 84	Well animals changing sex does happen with many species, but don't you think it's pointless for the male to be sterile? lol

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