Common imported species include tilapia, shark, sparidae or porgies and carp . Calamus is a genus of porgies in the family Sparidae. Pagellus is a genus of porgies in the family Sparidae. He had been a fisherman, caught porgies off Gloucester. Knobbed porgies can be distinguished by blue lines present on a yellowish under color. Knobbed porgies are carnivorous, and feed primarily on mollusks, polychaetes, crabs, and sea urchins. Porgies live in shallow temperate marine waters and are bottom-dwelling carnivores.