Longli fish is seafood. Longli fish is a kind of marine fish, which is a common fish species in China. Longli fish is a kind of butterfly and a kind of flounder. Cynoglossus semilaevis (scientific name: Cynoglossus semilaevis) is a large benthic fish, belonging to the genus Cynoglossus of Cynoglossus, with a slender body, a flat side, a tongue-shaped head, a hooked snout, dorsal fin and anal fin connected with caudal fin, and brown eyes. Longley fish is a large benthic fish in warm coastal waters, which has extremely high edible value and economic value. Its meat quality is delicious, the meat yield is high, the taste is smooth, the fish will not age after being cooked for a long time, and it has no fishy smell and peculiar smell, high protein content and rich nutrition.