The following differences:

1, the family is different: catfish: belongs to the family Lukidae, shad, long-nosed shad species. Catfish: belong to the catfish, catfish, catfish, catfish species.

2, the appearance of different: catfish: head smaller, there are two dorsal fins, tail forked, body surface without fish scales. Catfish: head is larger, only 1 dorsal fin, tail is round fan-shaped, the body surface has more mucus.

3, body color is different: catfish: body color is pink, fins are gray-black, white abdomen, back slightly gray. Catfish: body color is mostly dark brown or gray-black, slightly dark cloudy patches.

4, different habits: catfish: a bottom carnivorous fish, like to go out at night to feed, food to aquatic insects and their larvae, crustaceans, small fish, small mollusks.