How can i tell the difference between a male and female Zebra Danio fish?

Question

I have 2. one is a bit more fat and a tiny bit larger but neither are any bigger then 1 inch so i dont think they are full grown. How can i tell if one is female or male?

Answer 1

NEVER!!!!!!!!!!!!!!!!!!!!!!!!!!

Answer 2

females will be more plump whereas males will be slender.  without killing the fish, that's about the only way..  Kyle

Answer 3

If you feed them bloodworms for 2 strait weeks the females will be full of eggs and much much plumper!! Also, they are schooling fish, so you might want to get at least 6, that will also up your chances of getting a male and a female!