how to tell if your goldfish is female or male ?

Answers:
The way that I tell is by looking at their vent, where the poo comes out. If it sticks out a little bit then its a girl, if it doesn't or goes in a little bit then its a boy. You don't have to wait until they are ready to breed to tell this way.

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all male fish are smaller then the females

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Firstly, sexing young and juvenile goldfish is virtually impossible, you have to wait until the fish reach breeding age (usually one year old).

Secondly, sexing adult goldfish out of the breeding season is difficult, because the sexually distinguishing features only develop during the breeding season (in the spring time). That said, females may be deeper in the body than males.

For more information, check out the website below!

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check to see if it has vagina or penis.