guppy sexing

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wolfman21

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Does anyone know how early sex can be determined in guppy fry? One of my guppies had about 75 babies and I want to know when I will be able to determine their sex based on the analfin for females.
 

Neville

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i think male and female guppy fries look all the same, u have to wait until they reach adulthood.
 
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wolfman21

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Cool because the young ones I have all look alike and I thought I had all females and was kinda bummed because my lfs said they would take my males, so I was hoping I had some males in there.
 

bomber822

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i have two week old fry and i still can't tell the difference but i wanna get the males and females seperated before they start getting pregnant and i heard i think after or about a month you can tell the difference and that is when they start getting there color but thats also when they get sexualy mature and start having babies
 

Butterfly

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Actually their sexed by the analfin of the male about four weeks you can usually tell for sure.
Carol
 

purple_phoenix

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I've been able to tell mine at 3-4 weeks. They start showing their colours around then as well
 

peacemaker92

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I've had many guppy fry before and i could tell their sex after their 3 weeks old!
 

Blackswords

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An even quicker way. Females develop the gravid spot before the males develop the modified analfin.
 

Butterfly

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Blackswords said:
An even quicker way. Females develop the gravid spot before the males develop the modified analfin.
The males will develop the modified analfin before the females develop a gravid spot. If their really small a magnifying glass will help tell which is which.
Carol
 
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