The Panther Grouper is also known as the Polka-Dot Grouper and is an off-white fish with orderly polka-dots over the entire body. The polka-dots camouflage the fish and act as a disrupter by breaking up the body shape so that other fish and would-be predators cannot identify it. They grow rapidly, so be sure that the tank you have them in is of sufficient size. The Panther Grouper will eat any fish and invertebrates it can swallow.