Grouper. Grouper is a high-grade seafood, delicious flavor, tender meat, rich in protein and minerals, selling price of 300 yuan a catty, grouper than blackheads nutritious so, grouper expensive. Grouper body oval, laterally compressed, head large, short and bluntly rounded kiss, mouth large, with a well-developed pavement bone, body clad in fine pectinate scales, dorsal fins strong, body color can be changed with the environment. Adults are usually 20 to 30 centimeters in length.