can you tell if a fish is a boy or girl by the tail
no one
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.
no one
Depends on the species, but determined from an opening near the fish's anus.
it really depends on what type of fish. But they are usually more colorful than the feamale fish.
Look under its skirt
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
Just look between its fins, silly!
A person can tell if a koi fish is a boy or girl by looking at their fins. A female will have fan-shaped fins with very little color.