Red-spotted grouper, also known as red spot and positive spot, belongs to the genus Epinephelus of Perciformes. The wholesale price is 40 ~ 60 yuan Jin, and the retail price is 50 ~ 80 yuan Jin. It is the most expensive grouper. Red-spotted grouper is distributed in the western North Pacific Ocean, mainly in the South China Sea and the southern East China Sea of China, especially in the coastal areas of Guangdong. The red-spotted grouper is oval in shape, flat and thick on the side, with a large head and a convex back, and the head is longer than the body height. The kiss is short and blunt, and the eyes are big and lateral. The branchial foramen of red spotted grouper is large, with weak serrations at the rear edge of the anterior branchial lid, and three flat spines at the rear edge of the branchial lid bone, of which the central spine is the largest. The body is covered with small comb scales, and the upper and lower jaws are scaleless. The dorsal fin and anal fin of the red-spotted grouper are in the same shape as the dorsal fin strip.