how do do you know if te fish are boys un gurls?

Question

okie i got another fish today and i wanted to know hw you find there sex out they are 2 goldfish thnx x

Answer 1

the female will have a convex vent shape. It sticks out a little more before her anal fin.
The males will have breeding tubercles on his gills when he is ready to mate.
There is no other way to tell short of watching the female lays eggs. Neither gender is bigger and neither has thicker fins.

Answer 2

their shape is different if you buy a gold fish book they will show you how a male looks and how a female does