The Clown Grouper, Pogonoperca punctata, also known as the Bearded Grouper, is a hardy grouper with a voracious appetite. They should not be kept with shrimp or small fish that they will mistake for food. They are great for fish-only tanks.Groupers come from a family of fish known as Sea Bass. These fish have stout bodies with large mouths filled with more than one set of teeth. Groupers use powerful suction to engulf their prey by quickly opening their mouths. Their prey is swallowed whole instead of being chewed.