Duck-billed fish culture technology

First, the breeding position

The breeding site of platypus is Wadou Reservoir in front of the city. The water area of the culture area is large, the water depth is more than 6 meters, the dissolved oxygen is 6-9 mg/L, the pH value is 7-8.4, the total hardness is 20-40 mg/L, the ammonia nitrogen is 0.02-0.06 mg/L, the nitrite is 0.00 15-0.0 1 mg/L, and the water quality is good.

Second, the cage setting

Duck-billed fish cages are set with reference to silver carp cages, and the waters rich in plankton are selected, which requires stable water flow, shelter from the wind and the sun, and quiet environment. The cage frame adopts simple bamboo frame. The box body is made of polyethylene knotless net. The size of the cage is 5m× 5m× 2.5m, and the mesh size is 2.5cm ... Duckbill fish is afraid of light, and the surface of the cage is covered with black film.

Third, stocking density

When the platypus is reared alone, it is 80-1 00 per mu when it is 50-60 cm long, and 40-50 per mu when it is 2-3 kg. Polyculture, when the body length is 25 cm, there are 50 ~ 70 pieces per mu, which will grow to 1 kg by the end of the year. When the body length is 50 ~ 60 cm, it is 20 ~ 50 per mu, and it will grow to 2 ~ 3 kg by the end of the year. In the third year, the yield per mu is 7 ~ 8.

Extended data:

First, seed selection

Select high-quality seedlings with strong physique, lively swimming, neat specifications and no disease or injury. The stocking density is 20~40 animals per square meter. The specification is 10~ 15cm. According to the characteristics that the larvae of Amur sturgeon are sensitive to the change of water temperature, the temperature difference when the larvae enter the box should not be too large, and it is advisable to not exceed 2℃, and the adjustment should be as consistent as possible. Disinfect the fish with 1.5%~2.0% salt solution for 8~ 10 minutes before entering the box.

Second, scientific feeding.

At the initial stage of stocking, zooplankton (such as red worms) were mainly eaten, and then gradually domesticated, changed to floating granular bait, supplemented by night light bait. The bait should be fresh, non-perishable, nutritious and delicious in particle size. Feeding follows the principle of "four fixed".

When the water temperature is 20~30℃, the daily feeding rate is1.5% ~ 3%; When the water temperature is lower than 20℃, the daily feeding rate is 0.5%~ 1.0%. According to food intake, weather, water quality and so on. The feeding time is three times a day, 07:00-08:00,1:00-12: 00, 18:00- 19:00 respectively.

Baidu encyclopedia-duck-billed fish