Natural classification: catfish is classified in the order Ichthyoplasmata, order Catostomatidae, family Catostomatidae, genus Catostomatidae, while chub is classified in the order Scleractinia, order Carpostomatidae, family Carpidae, genus Chub.

Distribution in water: Catfish are found in the bottom layer of the water body, while silver carp are found in the upper layer of the water body.

Physical characteristics: Catfish has a flattened head, tentacles on the side of the mouth, no scales on the body surface, and a rounded fan-shaped caudal fin, whereas silver carp has a smaller head, no tentacles on the side of the mouth, tiny scales on the body surface, and a forked caudal fin.

First, the natural world classification

1, catfish for the chordata, fish, catfish order, catfish family, catfish genus.

2. Chub is a member of the phylum Chordata, class Scleractinia, order Carangiformes, family Carangidae, genus Chub.

Second, the distribution of the water body

1, the catfish is distributed in the bottom of the water body, preferring to gather in the bottom of the pool, caves and shady places.

2. Chub is distributed in the upper layer of the water body, inhabiting rivers, lakes and reservoirs.

3. Appearance

1. The caudal fin of catfish is rounded and fan-shaped, while the caudal fin of silver carp is forked and the ends of the two lobes are pointed.

2. Catfish have tentacles on the side of the mouth, while chubs do not.

3. The catfish has a flattened head and a laterally flattened tail, while the chub has a smaller head and a short, bluntly rounded muzzle end.

4. The catfish has no scales on its body surface, while the silver carp has fine scales on its body surface.

Four, food

1, catfish mainly worms, aquatic insects, benthic animals, small fish and shrimp, animal carcasses, organic debris, plant tender stems and leaves for food.

2. Silver carp, in the young fish stage, mainly to rotifers, branchiostoma, copepods and other zooplankton for food, after the juvenile period, mainly filter-feeding phytoplankton for food, but also ingested zooplankton.