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Old 06-27-2005, 03:46 PM   #1
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How long to determine sex of fry?

We have had a few batches of guppy fry and a couple batches of swordtail fry. We are wondering how long does it take before you can tell the sex of the fry.

Both types of fish have very obvious visual differnces between the sexes, but how long does it take before those differences show?
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Old 06-30-2005, 06:01 PM   #2
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I have a 2 month year old baby molly and I couldn't tell very well til about 2 weeks ago ....>> when he started to try to breed my females.
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Old 07-01-2005, 12:45 AM   #3
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yeah, I would say about two months will be average for most live bearers. your ph may also determine the ratio of the males to females.
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Old 07-01-2005, 02:15 AM   #4
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You should be able to tell within 2 to 3 months. Most of the time you can tell by the colors. The males tend to be very colorful with more finage.

And then there is the more obvious signs of a male. The male's modified anal fin, which is called gonopodium.

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Old 07-01-2005, 10:20 PM   #5
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whitetiger - how does the ph affect the male/female ratio. I have high ph, at about 8.
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Old 07-02-2005, 01:36 PM   #6
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It's also the water tempt that determines the sex too.
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Old 07-02-2005, 10:24 PM   #7
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OK,

So if I have a ph around 8 and a water temp about 80, what will I get more males or females?
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