Appearance characteristics:
5-6 catfish dorsal fins; Hip thread 73 ~ 86 (mostly 78 ~ 85); Pectoral fin strips 1, 14 ~ 15 (individual 16). Spine 59 ~ 6 1. External gill harrow 13 ~ 17. Body length is 5.3 ~ 6.4 times of body length and 4.4 ~ 5.3 times of head length. The head length is 2.9 ~ 3.5 times of the kiss length, the eye diameter is 8.4 ~ 16.5 times, and the eye distance is 1.5 ~ 1.8 times.
Catfish has a long body, a slightly flat head, a flat side and a smooth and scaleless surface. Skin is rich in mucus. The mouth is wide and upward, the end of the upper jaw is perpendicular to the back edge of the eye, the lower jaw is prominent, and there are many fluffy fine teeth on the upper jaw and the plow bone. Two pairs of beards with maxillary whiskers reach the base of pectoral fin. Young fish have three pairs of whiskers. After reaching a certain length, one pair of whiskers disappears (about 15 cm).
Catfish eyes are very small, covered with transparent film, and the eye spacing is extremely wide. The dorsal fin is short, atrophic and without spines, located in front of the ventral fin. The pectoral fin is round with a hard thorn, and the front serration is very thin, leaving only teeth marks for large individuals. The ventral fin is small, the end reaches or exceeds the starting point of the gluteal fin, and it is extremely long, and the back end is connected with the caudal fin.
Catfish's tail fin is short and its edge is slightly truncated. The ovary is 1 pair of cysts, and the mature eggs are orange. The testis is well developed and leaflike, with no bifurcation at the outer edge. Male fish's pectoral fin spines are thick and short, and the serrations at the rear edge are very developed. The female's pectoral fin spines are slender, with only small spines at the rear edge. Skin color varies according to the environment. The back and sides of young fish are mostly yellow-green, and adult fish are grayish brown. The abdomen is white and the fins are gray-black.
Extended data:
Life habits of catfish;
Catfish live in the middle and lower layers of rivers, lakes and reservoirs, and mostly inhabit the bottom layer with overgrown aquatic plants and slow water flow. Hidden during the day, very active at night, used to swim to shallow water for food. After autumn, they live in deep water or mud for the winter.
It is a carnivorous benthic fish, often crouching at the bottom full of weeds, waiting for small fish to approach and swallow with their mouths open, and also eating shrimp and aquatic insects. Live better and grow faster in dirty water.
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