It depends on what species of catfish! There are thousands upon thousands of species. Some fairly easy to tell, some very subtle, some impossible! Work out what species you want to sex and search Planet Catfish, then you'll know!
No that is a dumb way to put in a girl is dumb!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!! From what I have heard the girl has a rounder body than the boy. The boy is longer and thinner with slightly longer fins but it can be very difficult to tell as specially when they are young.
how do i tell if my my turtle is a girl or a boy?...
you cannot tell if the caterpillar is boy or girl
YOu can not tell the difference between a girl or boy starfish.
its harder for a boy to tell if a girl likes him
can you tell if a fish is a boy or girl by the tail
by asking its mother if it is a girl or a boy and plus you can tell by the face
you can tell if its a girl or a boy byits butt or eyes. if its a girl, it will have small pupils. if itsa boy, it will have large pupils.
i don't know if it is a boy or a girl
It can be either way, a girl can tell a boy that she loves him or a boy can tell a girl that he loves her.
You can tell by the tail if the tail is short than its a girl if the tail is long its a boy!
You can tell whether or not your rabbit is a boy/girl by looking under its butt.