Mullets are fat and short, while barracudas are slender. Mullet has a large eye ring with a blackish inner membrane and center, while barracuda has a small eye ring with a reddish eye crystal fluid. It belongs to the family Mugilidae (Mugilidae) and the genus Mugil, which is a wide-temperature and wide-salt fish. Adaptation to the temperature range of 3 ℃ ~ 35 ℃, suitable for water temperature of 12 ℃ ~ 32 ℃, the salinity of the adaptive range of 0 ~ 0. 04, can be in freshwater, brackish freshwater and brackish water life, like to inhabit in the coastal coastal inshore, gulfs and rivers into the sea, is the southern coast of China's brackish freshwater aquaculture is one of the most important economic fish, but also one of the most widely distributed in the world of the important economic fish.

2. The body of the mullet is long, with the anterior part nearly cylindrical and the posterior part laterally compressed, the body length is 4.1-4.8 times of the body height and 3.8-4.1 times of the head length. Head medium-sized, slightly elevated on both sides, dorsal view broadly flattened, muzzle broad and short. Eyes large, rounded, situated in anterior half of head. Anterior and posterior fat eyelids well developed, reaching to pupil. Nostrils 2 on each side, situated above the front of the eye, anteriorly sharp, with a central protuberance. Both jaws with downy teeth, arranged in a single row. Tongue large, rounded, located in the posterior part of the mouth, not free. Gill pores broad, gill rakers slender, gill cover membrane not attached to isthmus, anterior gill cover bone and gill cover bone margins without spines. Mullet Mullet Pseudogills well developed. Scales large, body scales pectinate, head rounded, all fins except first dorsal fin with small rounded scales, one long triangular axillary scale on either side of the base of the first dorsal fin, axil of the pectoral fin, upper part of the base of the ventral fin, and in the middle of each of the two ventral fins. The lateral line is inconspicuous, and there is a small unopened tube in the center of the body scales. The two dorsal fins are short and far apart.

3. Pike covered with rounded scales. The dorsal side is greenish gray, the ventral side is light gray, and the scales on both sides have black vertical lines. For the offshore fish, like inhabiting the mouth of rivers and bays, but also into freshwater. Sex lively, good jumping, in the countercurrent often in groups of anadromous, eat the organic matter in the mud underwater. Larger, China produced in the South China Sea, East China Sea, Yellow Sea and Bohai Sea. Barracuda body slender, the largest barracuda can grow to 1.8 meters long. The head of the barracuda is short and wide with large scales. The dorsal side of the barracuda is greenish gray, the ventral side is light gray, and the scales on both sides have black vertical lines. The barracuda lives along the coast, at the mouth of rivers or in brackish water. The barracuda loves to live in groups and feeds on the organic matter in the mud under the water.

4. Prickly pike individual small, generally about 200 millimeters long, distributed in the Indian Ocean and the western coast of the Pacific Ocean, China is only produced in the South China Sea and the East China Sea. Barracuda, mullet larger body size, generally 200-500 millimeters, large 600-800 millimeters. The barracuda is the main harbor fish species in the Yellow Sea and Bohai Sea, and the mullet is the main harbor fish species in the East China Sea and the South China Sea. The barracuda is distributed in the western part of the North Pacific Ocean, while the mullet is widely distributed in the Atlantic, Indian and Pacific Oceans. Barracuda and mullet are produced in the four major seas of China: South, East, Yellow and Bohai.