Swordtails: how long before you can determine sex?

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Guzalot

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I have two young swordtails that look like they are going to avoid being eaten by the bigger fish. Theare approximately 6 weeks old. At what age will their sex become apparant?
 

dan da man3042

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i dont no but i would sur like to no because i am thinking bout breeding them soon
dan
 

Tinkersfishfamily

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the way to sex a sword tail is ..only males have the sword on the back tail and females are more rounder then males
my 2 sword tails are lovely there such pleasent fish to watch
 
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Guzalot

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Tinkersfishfamily said:
the way to sex a sword tail is ..only males have the sword on the back tail and females are more rounder then males
my 2 sword tails are lovely there such pleasent fish to watch
Yes, but at what age does the "sword" become apparant?
 

Richard

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The appearance of the sword on males from the same batch of fry varies from fish to fish, but a good average on time before appearance of the sword would be 6-9 months, though some do start to grow before that.. a better way to determine the sex of the fish would be to check the analfin which develops before the sword does.. the male's analfin is more phallic in shape.
 
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Guzalot

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Good information Richard. Thanks!
 
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