Tropical Fish Keeping - Aquarium fish care and resources

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-   -   how to tell swordtail males from females (

cleghornkid 08-20-2006 08:03 PM

how to tell swordtail males from females
my wife saw some sword tails in the store and fell in love with the idea of breeding them but we do not know how to tell the males from the females any help would be gratefull.

joeshmoe 08-20-2006 08:15 PM

Here i have a pic of male can u see his last fin on bottom right thas a (modified anal fin) only males have this .

firearies 08-22-2006 08:20 AM

Easiest way to tell swordfish apart: male have a long "swordlike" extension on their tales. The female do not. There are some swordtails called lyre tail that have the tail extend on the top and bottom. Also in the lighter females you can look for a gravid spot. This looks like a dark spot close to were their anal fin is. Hope this helps.

Lupin 08-22-2006 09:32 PM

Rather than distinguishing it through the other fins, Joe's pic clearly shows a male. Males have pointed fin near their anus which is a sperm depositor called gonopodium.
Females have a triangular shaped fin near their anus.
Males with long and feathery gonopodiums are considered sterile as their long gonopodiums cannot reach the female's vent.

joeshmoe 08-22-2006 09:33 PM

history class all over again

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