1. Appearance: catfish has a long body, flattened in front, laterally flattened in back, flattened head, small eyes, wide mouth and two pairs of whiskers. The chub has a long body but flattened laterally, a small head, large eyes, a small mouth and no whiskers.

2, habits: catfish is a benthic fish, like to live in rivers, lakes and other waters of the bottom, to small fish, shrimp, aquatic insects and other food. Silver carp is a kind of pelagic fish, like to live in the rivers, lakes and other waters of the middle and upper layers, to the plankton for food.