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Which marine fish can't be raised artificially at present?
Spanish mackerel, also known as mackerel, has many kinds, such as "Chinese mackerel", spotted mackerel and Kangshi mackerel. The common names of mackerel are swallow fish and mackerel. Spanish mackerel has sharp teeth, fast swimming, fierce temperament, long flat side, bright silver color, dark stripes or black-blue spots on its back, big mouth, sharp teeth, fast swimming, fierce temperament and difficult artificial reproduction.

Pseudosciaena crocea, Pseudosciaena crocea, Grouper and Pseudosciaena crocea, also known as Pseudosciaena crocea, Daxian, Pseudosciaena crocea, Red Melon, Jinlong, Huang Jinlong, Osmanthus fragrans, Dazhong, Hongkou, Grouper and Pseudosciaena crocea, are the traditional "four major seafood" (Pseudosciaena crocea, Pseudosciaena crocea. Golden yellow. The tail handle is slender. The scales are small, and there are 8-9 rows of scales between the starting point of dorsal fin and the lateral line. 25-27 vertebrae. They usually live in deep-sea areas, migrate to offshore areas from April to June to lay eggs, and then scatter along the coast to find bait, feeding on fish and shrimp, which is difficult to cultivate artificially.

Pomfret, alias mirror fish, silver carp, long-tailed turtle, long mouse, dog sleepy fish, pomfret, mirror fish, flat fish, white long, pike, etc. The body is short and tall, and the polar side is flat and slightly rhombic. Small head, round kiss, small mouth and thin teeth. The ventral fins of adult fish have disappeared. The caudal fin is deeply forked and the lower leaf is longer. The body is silvery white, and the upper part is slightly bluish gray. Feeding on crustaceans. Pomfret is a large fish with both edible and ornamental functions in tropical and subtropical areas, and it is difficult to cultivate it artificially.

Sardines Sardines are called sardines in Hongkong, also known as Sa Ding fish, mackerel and roe. The smallest is two inches long and the largest is about a foot long. The lower jaw is slightly longer than the upper jaw, the teeth are not obvious, the back is pale and the abdomen is white, and the meat is beautiful. It is mainly used to make canned food. It was originally captured in Sardinia, Italy, hence its name. In ancient Greek, it was called "sardonios", which means "from Sardinia". It is distributed in the temperate marine area of 6 ~ 20 degrees north and south latitude, and it is difficult to breed artificially.

Hemiptera Hemiptera, namely flatfish and high-eyed sole, is the general name of sole fish, including sole family, sole family, sole family and tongue sole family. This kind of fish has a flat body. When it grows up, its eyes gradually move to one side of its head and lie flat on the bottom of the sea. It is extremely difficult to breed artificially.

Small yellow croaker Small yellow croaker, also known as small yellow croaker, vertebrate, bony fish, also known as: small fresh, big eyes, color, cucumber, ancient fish, yellow croaker, small spring color, golden dragon, thick onion, also known as "yellow croaker" and "small yellow croaker". It looks like a large yellow croaker, but its head is longer, its eyes are smaller, its scales are larger, its tail stalk is short and wide, and there are 5-6 rows of scales between the starting point of dorsal fin and the lateral line, which are golden yellow. Fish have obvious vertical movement, rising at dusk and setting at dawn, and inhabit the bottom or near the bottom during the day, so it is difficult to cultivate artificially.