1, pond treatment: 15 days before stocking, fill the pond with new water, and then use 80-100kg of quicklime per acre of pond to splash the whole pond. 2, stocking density: splash to summer flower, stocking 15-20 million splash fish species per acre, summer flower to autumn piece, stocking 15-3 million fish species per acre, while raising 200-300 chub, autumn piece to commercial fish, stocking 1800-2300 autumn piece fish species per acre, while raising white chub, silver chub. 2300 tails of fall flake fish species, at the same time rearing chub, chub.

I, freshwater silver cod culture technology

1, pond

(1) before stocking, drain the pond in the water exposure 2-3 days.

(1)About 15 days before stocking, fill the pond with new water to a depth of 0.3m, and then use 80-100kg of quicklime per acre of pond to splash the whole pond, or use 15-18kg of bleach slurry per acre of pond to splash the whole pond.

(2) About 2-3 days after the end of disinfection, apply 200-300kg of decomposed chicken manure per mu pond.

2, stocking density

(1) Splash to summer flowers, each mu pond stocked with 15-20 million tails of splash fish species, feeding about 30 days, you can get 12-16 million tails of summer flowers (3-4cm or so).

(2)Summer flower to fall piece, each mu pond stocked with 15-30,000 fish species, while rearing 200-300 silver carp of the same age, feeding about 90 days, you can get 14-28,000 tails of fall piece of fish species (80-100g/tail).

(3) Autumn fillet seed to commercial fish, stocking 1800-2300 tails of autumn fillet seed per mu pond, while keeping 15-20 tails of chub, 10-15 tails of chub.

3, feeding

(1) from the splash to summer flower stage, feed protein content control at about 42%. Summer flower to fall fillet fish species stage, feed protein content control at about 38%. Autumn fillet species to commercial fish species stage, feed protein content control at about 35%.

(2) When the water temperature is about 15°C, the daily feeding rate is 0.2-0.3% of the fish weight. When the water temperature is 16-20°C, the daily feeding rate is 0.6-1.2% of the fish weight. At water temperatures of 21-25°C, the daily feeding rate should be 1.2-3% of the fish's body weight. When the water temperature is 26-30°C, the daily feeding rate is 3-6% of the fish body weight.

(3) Splash to summer flake stage, feeding 3-4 times a day, in order to eat within 50 minutes after feeding. Summer flower to fall fillet species, feeding 2-3 times a day, to feed within 60 minutes after eating is appropriate. Autumn fillet species to commercial fish species, feeding 2 times a day, in order to feed within 60 minutes after eating is appropriate.

(4) If the number of feedings is more than 2 times a day, the morning feeding should occupy about 40-45% of the daily feeding.

Two, what is the appropriate temperature of freshwater silver cod

1, freshwater silver cod (barbel) can survive in the environment of 1-30 ° C, the appropriate growth water temperature of 18-27 ° C, the optimal growth water temperature of 24-27 ° C.

2, when the water temperature is lower than 15 ° C, freshwater silver cod almost stopped Feeding, gathered in the deep pond overwintering (overwintering, the water temperature to maintain above 4 ° C is appropriate).

3. Freshwater cod is a kind of salinity-resistant fish, when the salinity in the water body is lower than 3.2‰, and the alkalinity is lower than 14.32mmol/L, the embryonic development of freshwater cod is not affected. When the salinity in the water body is lower than 5.1% and the alkalinity is lower than 14.32mmol/L, the freshwater silver cod fry are not affected.

4. When breeding, it is recommended that the salinity of the breeding water body should not be more than 6‰ and the alkalinity should not be more than 25.1mmol/L.