Catfish have four whiskers that add up to four whiskers above their mouths, long on top and ? short on the bottom, and are usually dark brown or gray-black in color.

Catfish have small eyes and a flat head. The mouth is positioned underneath, with a small slit that only reaches the underside of the front part of the eye on the very back. Adult catfish have two pairs of whiskers, one **** four, the upper jaw whiskers can extend to the last position of the pectoral fins, the lower jaw whiskers are shorter, no adult catfish whiskers only three pairs.

The catfish has a bulge in all of its jaws, the teeth have small gaps and a fuzzy appearance, the maxillary and pyriform teeth are arranged in curved bands, and the pyriform teeth are uninterrupted throughout, with the middle part of the back being somewhat recessed. The catfish has a large amount of mucus, has no adipose fins, and has a very long anal fin, the posterior portion of which extends to the caudal fin.

Expanded Information:

The catfish is an omnivore, and it's main diet includes aquatic insects, organic debris, etc. It also eats small fish, rodents and other living things, and even eats the carcasses of its own kind when it is not full. Because catfish are omnivorous, they are very resilient and can survive in polluted water. In some sewage environments with chicken and pig manure, catfish can survive.

There are limits to how much catfish can tolerate the environment. If the water quality is poor, catfish not only have difficulty reproducing, but also grow poorly. If the water contains toxic and harmful substances, catfish will also be poisoned and even die.

People's Daily Online - Catfish is not a dirty fish