If varies between species, some species finding the gender is easy and some is nearly impossible. Lots of species have a difference in color of the dorsal fin (the fin on the top of the fish). Others will have color variations elsewhere. Some will be bigger than others although this is not very reliable as one can just be older than the other. A sure way to tell the gender is which one lays eggs. Betta Fish are easy to differentiate the genders because of the fins and colors. It really depends on what species of fish you are trying to find the gender of.
Female fish are always bigger than the male fish. The male fish is usually also more attractive.
The difference between a female or a male is that the female fish is bigger than the male. Hope that helps =D
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.
What exactly is a fish coin?
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
Male fish always small but finn is hard
Yes, there are male fish and female fish.
by the fish's dorsal fin
the females are generally bigger
the rosy red fish is the boy.
belly of female gold fish is larger than male gold fish and gill of male gold fish is rough than female gold fish.