How do you know if a fish is a boy or girl?

Question

Any kind of fish...does it matter on details or does anybody actually know unless one has babies?

Answer 1

Mostly it is not possible to tell the difference. In liuvebearers,(guppies,swordtails,platies and mollies) it is easy. the male has a long thin sex organ and has sex similarly like mammals. The females are a liitle larger and less colorful. Males have fancier tails.It varies from one species to another.

Answer 2

For most fish you can tell males from females, but it does matter on the details. It really matters what kind of fish you are talking about.

MM