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Old 06-01-2013, 11:58 PM   #1
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Guppy inbreeding

I have a ten gallon that has become a guppy nursery. I have a few different generations of fry, the oldest group is about 3 months old. I was under the impression that it took a few months for them to reach sexual maturity, but recently read that they can be impregnated quite early. How long does it take for them to be able to become pregnant/impregnate? Should I separate them by gender? If so, at what age? Should I be worried about inbreeding?
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Old 06-02-2013, 12:46 AM   #2
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Also, at what age can you determine the sex of guppies? I can't seem to tell a difference, other than that some seem to be greeting a bit of color.
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Old 06-02-2013, 01:10 AM   #3
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Well the older they get the easier it is to tell the gender. Guppies are one of the easiest to sex. Males are the prettier ones with bigger wavy tail fins. And they can get pregant very early since there isn't much of a limit to sexual maturity compared to other fish.
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Old 06-02-2013, 01:15 AM   #4
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I can definitely differentiate between male and female adult guppies but not the juvies. I guess I'm wondering if they will all be pregnant with their siblings babies by the time I can tell the sexes apart. Is that something I should be concerned about (other than the eew factor :/) ?
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Old 06-02-2013, 01:24 AM   #5
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Eventually you will maybe get some problems. Guppies don't have a problem for the most part with that though..it usually takes to the 3rd or 4th generation to get them. To address this you can just add a couple more "new" guppies to the tank to get the genes less imbreded, if that's a word lol.
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Old 06-02-2013, 01:24 AM   #6
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As for the gender..you can maybe see the gravid spot if you can see it. Otherwise they might be too young yet still.
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Old 06-02-2013, 01:28 AM   #7
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Eventually you will maybe get some problems. Guppies don't have a problem for the most part with that though..it usually takes to the 3rd or 4th generation to get them. To address this you can just add a couple more "new" guppies to the tank to get the genes less imbreded, if that's a word lol.
Good to know- I hope to have gotten rid of most of them before I get 3rd and 4th generations.
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Old 06-02-2013, 01:30 AM   #8
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As for the gender..you can maybe see the gravid spot if you can see it. Otherwise they might be too young yet still.
I'll look - if I can see a gravid spot, could they already be pregnant?
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Old 06-02-2013, 01:30 AM   #9
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Good to know- I hope to have gotten rid of most of them before I get 3rd and 4th generations.
If you have another tank with bigger fish you can always feed the fry to them if you had too many being born.
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Old 06-02-2013, 01:45 AM   #10
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What about checking the anal fin?
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