There is no visible difference between the sexes of Oscars no matter how much BS some people say about fin shapes or size or colour. You just have to see them spawning. Then its the female laying the eggs and the male doing the fertilising.
Contrary to what some uninformed folks say. There are no visible differences between male and female oscars. So you don't know until you see them breeding.The female is the one that lays the eggs.
One way to sex a tropical fish is to observe a mature male or female. The female will eventually lay eggs and the male will show his penis if a mature female is around.The way to sex a tropical oscar fish is to simply observe whether or not the female lays eggs. It is not possible to tell by just looking at the fish.
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?
There is 1 way to tell on the male Oscar fish there are two small holes where his bum is there is another hole witch will be the same size unless its just had a poo haha but on the female Oscar there is two holes and one is bigger than the other and one is the anus and the othere is you know what hope this helps
flowron
you can't
the rosy red fish is the boy.
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
It all depends on how much other fish you have in the tank. Oscars need a lot of room so if there's tons of other fish in there it could cause problems. But if you have a couple it would be fine. If its a male Oscar its probably best you don't have them in a tank with any other Oscars. I volunteer at a pet store where they sell the fish so that's how I know this..
A girls cap is bigger and the boys cap is smaller