lemon tetras, boy or girl?

[Beth]

Anybody know how to determine the sex of lemon tetras? I have one that is really fat and wondered if it was a pregnant female or just a chubby fish?

[OrionGirl]

Lemon Tetra
--FM - deeper body; slighty less body color

This is what I found when I searched for lemon tetra gender on google.

Tetras are egg layers, so she wouldn't be pregnant. She might be egg laden.

[RTR]

The prominent black edge on the anal fin of males is the best differentiation I know.