1, head: the chub's head is large and wide, the length is about one-third of the body length, while the chub's head is smaller, the length is about one-quarter of the body length.2, scales: chub's scales on the surface of the body are white, without spots, while chub's body side is dark brown with a blackish or yellowish spots.3, abdomen: chub's abdomen has an obvious crease in the center of its abdomen, while chub's abdomen is smooth with no crease. The chub's abdomen is smooth and has no crease.

First, the difference between the chub and chub

1, head

The head of the chub is large and wide, the length of about one-third of the body length, or even half, so it is also called the big head fish, fat head fish, and chub head is smaller, the length of about a quarter of the length of the body.

2. Scales

The scales of chub and chub are small, but the scales of chub are white without spots, while chub is dark brown with black or yellow spots on the side of the body.

3. Abdomen

The chub has a very obvious crease in the center of the abdomen and runs through the entire abdominal surface before and after the ventral fins, while the chub's abdomen is smooth and has no crease.

4. Pectoral fins

The pectoral fins of the chub do not exceed the base of the ventral fins, while the chub's pectoral fins are longer, with the posterior margins exceeding the base of the ventral fins.

Second, chub farming methods

1, pond treatment

(1) pond depth control in 1.5-2.5m or so, the thickness of silt at the bottom of the pond should not be more than 30cm, the water source requires good water quality, no pollution.

(2) When the water is drained to about 10cm, use 75-100kg of quicklime per mu of pond for disinfection.

(3) 5-7 days before stocking fry, each mu pond (1m water depth) apply 200-300kg of decomposed organic fertilizer to fertilize the water, cultivate plankton, as bighead carp bait.

2, stocking

(1) Around February and March, when the water temperature is 8-10 ℃, stocking. Each mu pond is stocked with 700 chub, 100 chub, and a small amount of crucian carp.

(2) Fish species require good size, strong vigor, robust body, consistent specifications, and no damage to the appearance.

(3) Before stocking, the fish species are sterilized using salt water.

3, management

(1) feeding feed, follow ? Quality, timing, positioning, quantitative? principle, according to the fish species feeding rules reasonable feeding. In general, feeding 2-3 times a day, the amount of bait for about 1-3% of the weight of the fish.

(2) winter and spring seasons, the application of manure fertilizer, the water transparency will be maintained at about 30cm. In summer and fall, add new water every 15 days or so, and keep the water transparency at about 20cm (the water temperature difference before and after the water change should not be more than 3℃).

(3) Keep the dissolved oxygen in the pond above 4mg/L, and the ammonia nitrogen content of the water body should not be more than 0.2mg/L.

(4) During the period of May-September, use 20kg of quicklime slurry per acre of pond to splash the whole pond, and use it 2 times per month.