Most types of fish can not be told by visual differences and must be sexed by venting. Which is looking at the openings under the fish to judge size, shape and distance between to determine sex.
What exactly is a fish coin?
flowron
the rosy red fish is the boy.
In order to know if a Silver Arowana is male or female, you need to look at the size of the fish. The male fish are bigger in size.
If the fish is male it will be bright and colourful, if it is female it will be quite dull
male is huge and grey female is colurful
Your betta fish is a female if she has smaller fins than an average male.
The males have a red tail.
they females are brighter and the males are paler
Male fish have claspers on their lower belly, so if the fish doesnt have these claspers, then it's a female. I dont know if it's the same with goldfish, but since they're fish, it probably is.
The female beta fish is usually plain in color, while the male is typically very colorful.
the female beta fish is "plainer" than the male as where the male is a darker shade near the face and lighter shade near the tail.