Artificial hatching and management techniques of cultured spoon-nosed Sturgeon

Spoon-nosed Sturgeon (Polyodon spathula) is a large freshwater economic fish from North America. Because of its unique shape and flat snout, it can also be used as a valuable ornamental fish. Culture in ponds can not only regulate the culture environment, improve water quality, but also obtain better economic benefits.

Key points of artificial hatching technique of spoon-nosed Sturgeon ① egg release density. Each cylindrical incubator with a diameter of 15cm and high 50cm can hold 50-100000 fertilized eggs. ② controls the water flow so that all fish eggs can slowly float and tumble in the incubator, and the initial control is about 8L/min. ③ controls the water temperature between 18 and 20 ℃. ④ keeps the amount of dissolved oxygen in water above 6mg/L. ⑤ adjusts the pH to slightly alkaline. Prevention and cure of ⑥ disease. The infection of water mold can be controlled by adjusting the appropriate water flow rate to remove dead and infected fish eggs.

There are two ways of pond captive culture, one is spoon-nosed Sturgeon, mixed with other fish, and the other is other fish, with spoon-nosed Sturgeon. Main technical points ① pond conditions. With sufficient water and dissolved oxygen, the fish ponds should be thoroughly cleaned and disinfected before releasing the fish. ② fingerling is released. Choose the species with strong physique and active swimming. Stocking specifications generally require individuals to be as long as 15-20cm. The stocking density is divided into two types: spoon-snout Sturgeon is the main fish culture, and the stocking density is 250ind / mu. If spoon-snout Sturgeon is used as fish culture, the stocking density is 50-100fish / 667m2. ③ feeding management, water quality control, pay attention to the weather, water quality changes, timely add new water to the pond or turn on the aerator to increase the dissolved oxygen in the water; fertile water, bait, the main spoon snout Sturgeon in the pond, fertilizing before the fish enter the pond to cultivate zooplankton, and then, according to the situation, to maintain the amount of zooplankton in the pond; feed feeding, to achieve three fixed, that is, fixed quality, positioning, timing.