1, catfish: elongated body, head flattened, tail laterally flattened; mouth inferior, small mouth cleft, the end of only up to the front edge of the eyes below; jaw protruding, interdental fine, fluffy, jaw teeth and pear teeth are arranged in a curved band, the pear tooth band is continuous, the middle of the posterior edge is slightly concave; catfish mucus, the body is not scaly; small eyes, by the dermatome; adult fish whiskers 2 pairs of four.
2. Silver carp: the body is laterally flat and slightly high, the abdomen is narrow, and the abdominal ribs reach from the pectoral fins to the anus. The head is large, about 1/4 of the body length, and the muzzle is short, bluntly rounded, and the mouth is wide. The eyes are small, located below the median axis on the side of the head. Pharyngeal cephalic teeth in 1 row, herbaceous and flattened.
Second, different habits
1, catfish: catfish mainly live in rivers, lakes, reservoirs, pits and ponds in the lower and middle layers, mostly in the littoral zone activities, during the day, more hidden in the grass, under the rocks or deep water, night feeding activities; is a nocturnal animal, daytime quietly hidden in the bottom of the river pits or under the roots of the tree; catfish for the environment of the adaptive capacity of the catfish is superb, the freshwater catfish widely distributed throughout the world a variety of freshwater areas. The freshwater catfish is widely distributed in a wide variety of freshwater areas around the world.
2. Silver carp: A typical filter-feeding fish. It relies on the special structure of its gills to filter plankton from the water. Appetite is directly proportional to water temperature. Chub like high temperature, the most suitable water temperature of 23 ℃ ~ 32 ℃; lively temperament, like to jump, have the habit of swimming against the current, but the action is not very agile, more clumsy.
Three, habitat
1, catfish: most species are living in ponds or rivers and other freshwater.
2, silver carp: catfish mainly live in the rivers, lakes, reservoirs, pits and ponds of the middle and lower levels, mostly in the coastal zone activities.
Baidu Encyclopedia-Catfish
Baidu Encyclopedia-Chub Fish