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Old 03-30-2017, 03:03 AM   #1
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Sex of platy fry?

I've been getting batches of platy fry for the past couple of weeks and I've noticed they're all female. I did my research and found out that platy can change the sex from female to male, well it happens when the gonopodium develops. I can't find a definite answer on how long (on average) does it take for the gonopodium to develop? I'm just concerned because I have a lot of fry and they're in my female platy tank, I just don't want to end up with more fry if one of them decides to develop a gonopodium. At what age do the males start to mate?
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Old 03-30-2017, 06:16 AM   #2
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They develop around 3 months and older...
It can happen pretty quick so check daily..
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Old 03-30-2017, 10:02 AM   #3
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They develop around 3 months and older...
It can happen pretty quick so check daily..
Do you know when the males start teeing to mate?
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Old 03-30-2017, 10:37 AM   #4
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I am not 100% on this but IMO they are ready to go when you see it...
It is a daily battle for me to sort my swordtail juvis..I have 9 varieties and some show gonopodium in 2 months and others still nothing after 4-5..
There are also 'late bloomers' that will stay hidden males due to [IMO] Growth Inhibiting Hormones produced by the alpha males...Possibly as long as a year !
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Old 03-30-2017, 10:55 AM   #5
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Originally Posted by coralbandit View Post
I am not 100% on this but IMO they are ready to go when you see it...
It is a daily battle for me to sort my swordtail juvis..I have 9 varieties and some show gonopodium in 2 months and others still nothing after 4-5..
There are also 'late bloomers' that will stay hidden males due to [IMO] Growth Inhibiting Hormones produced by the alpha males...Possibly as long as a year !
How do you know if they're going to stay female? This is so confusing lol
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Old 03-30-2017, 12:18 PM   #6
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I have a few batches myself. The males fin will be a little longer, thinner and stay closer to their stomach.

The females will stay in a fan position for a longer period of time. If you have quite a few platies there will usually be a few of each gender. Between 2-4 months you will begin to see distinction between the genders.
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Old 03-30-2017, 12:29 PM   #7
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I have a few batches myself. The males fin will be a little longer, thinner and stay closer to their stomach.

The females will stay in a fan position for a longer period of time. If you have quite a few platies there will usually be a few of each gender. Between 2-4 months you will begin to see distinction between the genders.
I have added a photo. Hopefully this helps a little. These platies are about 4 months old.
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Old 03-31-2017, 03:48 PM   #8
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Do you know when the males start teeing to mate?
The moment they develop that gonopodium. Also, inseminated females can hold sperm in reserve, so you can still get fryweeks after removing the males.

Trust me, I've been dealing with that...
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Old 03-31-2017, 08:56 PM   #9
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The moment they develop that gonopodium. Also, inseminated females can hold sperm in reserve, so you can still get fryweeks after removing the males.

Trust me, I've been dealing with that...
I'm dealing with that with my guppies. Lol
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