no one
can you tell if a fish is a boy or girl by the tail
no one
just tell him you didn't kiss another boy.
you can tell by the dots or spots on the boy fish and on the girl is just a gold fish colres
the boy has a ball sack
put a mirror in front of the tank if the fish bloats out its gills its a boy.
Look under its skirt
Depends on the species, but determined from an opening near the fish's anus.
im a boy and when i fancy a girl i either tell her or just move in 4 a kiss
The boy likes or is trying to get your attention. Or he wants to kiss her or tell her he loves her,
tell him that you like him and be all sweet if he likes you gack and to afraid to kiss you you kiss him! You tell him that you like him. If he likes you back but to afraid to kiss you, you kiss him!
By the size, it's patterns/colours I BELIEVE TAHT THE GIRL TROPICAL FISH HAS EITHER A LONGER TAIL OR IS A LIGHTER COLOR THEN THE BOY TROPICAL FISH