Hump on the back.
Note the back fish . If you see a hump , then most likely it is a male . This rule does not apply to pink salmon , this species of fish has a hump , both female and male . Female pink salmon may have a small or even very decent hump on the back. Therefore, here is a small chance to find fish with caviar.
Pay attention to the abdomen.
This method is most successful . Take a closer look at the fish’s abdomen ; if there is caviar, it will be rounded . This method is considered effective if you know for sure that you have female in your hands. Also choose uncut fish, only then you have a chance to buy fish with caviar.