1, the distribution area is different: the salmon originated in the northern Atlantic Ocean and widely distributed in tropical or temperate oceans; What does ankang fish generally mean? ? ? ? Widely distributed in the Indian Ocean, the Pacific Ocean and the Atlantic Ocean, also found in the Arctic Ocean, along the coast of China.

2. Different shapes: the body of the squid is relatively long, slightly flat on the side, and the abdomen is round. The first half of the head is slender, slightly tubular, and the snout is flat and duckbill-shaped. The mouth is superior, the mandible inclines upward and is longer than the maxilla, and the end of the maxilla reaches below the anterior margin. The eyes are the same size, close to the snout, protruding to both sides, with wide cheeks, and the length behind the eyes is 2-2.5 times that of the snout. The back is dark gray, the abdomen and the lower half of both sides are silvery white, the pectoral fin is reddish, the dorsal fin and caudal fin are gray, the ventral fin and anal fin are gray, the caudal fin is black at the rear edge, and there is a slight black longitudinal stripe above the lateral line; Ankang fish is flat and soft. The head is big, broad and flat. The trunk is short. Wide mouth, front position. Mandibular protrusion, with canine teeth or sharp teeth of different sizes in both jaws, vomerous bone and palatal bone, and can lodging inward. The gill holes are large and the body is bare and scaleless. The periphery of the head has developed cortical tentacles. The first dorsal fin is partially detached, the first dorsal fin is located on the snout, and there are 1 skinlike snout tentacles at the end, and the second dorsal fin and gluteal fin are located at the tail. The pectoral fin is well developed, with 1 long muscle stalk. Ventral fin throat position. Because of its ugly figure, it is called ugly fish in Shandong. Because it sounds like an old man's cough, it is known as the old fish along the coast of Hebei Province.