Swordtails: how long before you can determine sex?

Guzalot

Member
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

Member
I don't no but I would sur like to no because I am thinking bout breeding them soon
dan
 

Tinkersfishfamily

Member
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

Member
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

Member
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

Member
Good information Richard. Thanks!
 
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