When the Red Devil Cichlid (Amphilophus labiatum (in USA) and A.citrinellum (in Australia)) reach maturity, in both species, the males develop a hump on their forehead. I do hope you realise that these fish grow up to 18 inches long and therefore require a very large tank.
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
What exactly is a fish coin?
flowron
the rosy red fish is the boy.
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.
they females are brighter and the males are paler
The males have a red tail.
Your betta fish is a female if she has smaller fins than an average male.
If it tries to pinch you it's a female if it's calm and doesn't pinch you it's a male
The female Tasmanian devil is much smaller than the male, but apart from that, there is little difference between the two, aside from the obvious difference of male and female reproductive organs. The Tasmanian devil is a marsupial, and the female therefore has a pouch in which she rears her young.