Shanwei fish is also called shank fish, fork tail fish; Guangxi people call it boneless fish; Guangdong people call it shanwei, fork tail or fork tail fish; shank fish is the main catfish species in North America. Its official origin is Missouri, Iowa, Nebraska, Kansas and Tennessee in the United States. Its common name is "pincer cat".

The claw fish has a longer body, the front part of the body is wider than the back, the head is smaller, the snout is slightly pointed, the mouth is subterminal, the body surface is smooth and scaleless, the mucus is rich, the lateral line is complete, and there are obvious spots on the skin. lateral hole.

There are 4 pairs of dark gray tentacles on the upper and lower jaws of the head, including 1 pair of nasal palps, 1 pair of jaw palps, and 2 pairs of palps, with different lengths. The maxillary palps are the longest, and the ends exceed the base of the pectoral fins. The nose whiskers are the shortest. The gill pores are larger, the gill membrane is not connected to the isthmus, and the forehead has obvious and irregular spots. The spots disappear in individuals weighing more than 0.5 kg.

Extended information:

Reproductive habits:

Clipperfish can lay eggs under rocky protrusions in rivers, lakes, reservoirs and ponds, or Under submerged trees, stumps, tree roots or in caves in waterways. The male fish of the claw fish is a typical nesting fish. After mating with the female, he drives away the female and guards the fertilized eggs until they hatch.

Usually, the spawning temperature range of channel catfish is 21-29℃, with the optimal temperature being 26℃. Water temperatures exceeding 30℃ are not conducive to the embryonic development of fertilized eggs and the survival of fry. The breeding season of channel catfish in the Yangtze River Basin is from June to July.

Those with a larger body weight (or age) will lay eggs earlier than those with a smaller body weight (or age). When spawning, each fish usually wraps its tail fin around the other's head. The male fish vibrates violently and discharges semen. At the same time, the female fish begins to lay eggs. After fertilization, the eggs become sticky and stick to each other and adhere to the bottom of the pool.