Depending upon the species of fish being farmed and the expertise and equipment being used by the fish farmers, some species are spawned and fertilised naturally and others have their ova and sperm...
There are basically 2 kinds of fish that are farmed. There are the ones for eating like Trout, catfish, Salmon, Barramundi, Bassa and Tillapia etc., and there are the keeping (hobby) ones like...