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Old 12-02-2012, 12:57 PM   #1
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Help with sexing guppy fry?

I would like to sex my guppies that are a month old but they never stay still long enough for me to tell which gender they are. Ik how to sex them but i need help on how to keep them still. Should i put them in something seperate to sex them?
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Old 12-02-2012, 02:54 PM   #2
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i wouldnt if you can't tell yet by watching them they probably are still to young to know, theres no mistaking them when they start to mature
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Old 12-02-2012, 03:42 PM   #3
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Yea well 4 of the 12 have dark gravid spots so they are female. but every single fry has an obvious fan shaped dorsal fin. Cld they all be female?
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Old 12-02-2012, 04:06 PM   #4
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nothing is for sure till you see the gonofodium develope , anil fin.
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Old 12-02-2012, 04:56 PM   #5
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Okay so now i have another question. Since all the fry have fan shaped fins will the males fins turn pointy or how does the gonopodium form?
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Old 12-02-2012, 05:03 PM   #6
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i wouldnt put any stock in fan or pointy fins at this young stage, i consider every baby a female till the gonopodium forms, not sure what changes happen inside the fish to transform him or her though, i just waited till it changed, which seems to happen all of a sudden.
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Old 12-02-2012, 05:15 PM   #7
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Oh okay. Thank you
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Old 12-03-2012, 02:16 AM   #8
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Hey lily!

I was in the same boat as you, convinced that the last two drops of my guppy produced ALL female batches...

Turns out I was just an anxious caretaker. I would say one month is too early to say, it took mine a solid 2.5-3mo until the males fins started showing some pointedness to them. Just continue doing what you're doing, and to watch the development until you are able to sex them and separate them
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Old 12-03-2012, 04:17 AM   #9
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All fry are born female. You just have to wait
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Old 12-03-2012, 08:35 AM   #10
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If you really want to know, get a small tank and cover three of the four sides with black paper. Cut a hole in the back piece of paper and shine a very bright light through it. You should be able to see the gravid spot of female fry when they swim by the light.
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Old 12-03-2012, 10:33 AM   #11
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Thank you for all the help
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Old 12-05-2012, 08:07 PM   #12
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i have 5 fry that are about 5 weeks old, some show the makings of a very small gravid spot, others dont, but all have the same anal fin shape as secondary sexual characteristics like color and the gono-whatever, until they are 3.5-4 months old usually... also, if a young female is in a female only tank, she can actually switch her sex to male... thats why i keep my babies with the males once they are bigger than snack size...
good luck!
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