1, Spanish mackerel: Perciformes

2. Swordfish: Paederia cristata.

Second, the appearance is different.

1, Spanish mackerel: Spanish mackerel is long and flat, showing a spindle shape. Generally, it is 25-50cm long and weighs 300-1000g. The largest individual can reach 1 m and weigh more than 4.5 kg. The tail handle is thin, with three raised ridges on each side, and the ridge in the middle is the longest and highest. The head is taller than the body. The mouth is large, slightly inclined, with large teeth and sparse arrangement.

The body is small and round, and the lateral line is irregular and wavy. There are black circular spots in the center of the body. There are two dorsal fins. The first dorsal fin is long and has 19 ~ 20 fin spines. The second dorsal fin is short, and there are 8 ~ 9 small fins behind the dorsal fin and gluteal fin. The pectoral fin and ventral fin are short and have no hard spines; The caudal fin is large and deeply forked.

2, saury: saury is slender, rod-shaped and flat on the side; The snout is slightly protruding and sickle-shaped. The top of the head is flat to the snout, with a weak ridge in the center. Eyes are bigger. In front of the mouth, the lower jaw is slightly longer than the upper jaw, the upper jaw is triangular, and the lower corner is elongated and cracked. Two small jaws, lined up in a line? . Both jaws extend forward in a short beak shape, and the lower jaw protrudes from the upper jaw with thin teeth. There are no teeth on the plough bone, palate bone and tongue. Free tongue tip.

The gill cover is separated and not connected with the isthmus. Gill rakes are many and thin. The dorsal fin and anal fin are located at the back of the body, without hard spines, and there are small detached fins on the back; The anal fin and ventral fin are white. Body length can reach 35cm. The pectoral fin is small and truncated. There are 2~3 rows of scales-wide olive longitudinal bands above the pectoral fin on the body side, and the baseband gradually narrows from the back of the body to the caudal fin.

Third, the distribution is different.

1, Spanish mackerel: Spanish mackerel is distributed in the western North Pacific Ocean. China is made in East China Sea, Yellow Sea and Bohai Sea. The main fishing grounds are Zhoushan, Lianyungang and the southern coast of Shandong.

2. saury: It inhabits tropical and temperate waters of the Pacific Ocean along the coast of Asia and America, and mainly distributes in temperate waters of the North Pacific Ocean, including the Sea of Japan, Alaska, Bering Sea, California, Mexico and other waters.

Baidu encyclopedia-Spanish mackerel

Baidu encyclopedia-saury