The method of culturing Sturgeon in cage

The series of Sturgeon has the characteristics of wide adaptability, fast growth rate, short culture cycle, good market prospect, high economic benefit and so on. Cage culture of Sturgeon is a good intensive mode of production, compared with ponds, Sturgeon culture has the following advantages: large exchange capacity of water, adequate supply of oxygen, fish not easy to get sick, high survival rate and yield, centralized and convenient breeding and management, convenient fishing, timely fishing according to needs, which is conducive to regulating the market; good taste of fish, no fishy smell, excellent commodity quality Save water, electricity, manpower and other expenses, reduce the unit cost, is conducive to the market price competition. In carrying out commercial Sturgeon cage culture, attention should be paid to the following technical methods:

Choose a good water area

When raising Sturgeon in cages, we should choose areas with wind and sun shelter, wide water surface, small wind and waves, water depth of more than 5 meters, micro-running water, fresh and pollution-free water quality and dissolved air volume of more than 5 milligrams per liter in large and medium-sized waters such as reservoirs, lakes and rivers. At the same time, we should not only avoid the main waterway, but also have convenient transportation.

Set up cages

The cage is mostly double-layer, made of polyethylene or PVC mesh, and the size depends on the size. The length and width are usually 10 meters × 4 meters, 6 meters × 4 meters, 5 meters × 4 meters and 4 meters × 3 meters, etc., with a height of 3 to 4 meters and a depth of 2.5 to 3.5 meters. The mesh varies according to the size of the fish species, with the principle of not escaping fish and being conducive to water exchange. generally, the mesh of Sturgeon species with a tail weight of 20 grams and 50 grams is 1.2 centimeters and 1.6 centimeters, and the tail weight of more than 100 grams is 2 centimeters. The bottom of the box should be sewn with a tight-eyed silk screen as a table to avoid feed loss. The cage is generally frame floating, supported by floating buckets and fixed with ropes, which can rise and fall freely with the fluctuation of water level, and should be installed 7-10 days before fish release to allow algae to grow, so as to prevent fish species from scratching the skin on the body surface after entering the box. Generally, every 4 cages are divided into one group, each with an interval of more than 2 meters.

Rational stocking

Sturgeon species should be released in winter and spring, requiring strong physique, no injury, no disease, lively swimming, large size and neatness. Stocking density per square meter cage: 60 fish species weighing 30 grams and 50 grams, and 20 fingerlings weighing 100 grams and 200 grams, respectively. Wash the fish with 3% salt water for 10 minutes for 15 minutes during stocking.

Scientific feeding

Breeding Sturgeon must be fed with full-price pellet feed. Feed nutrition standards are: protein content of about 40%, of which animal protein accounts for more than 15%, fat about 9%, carbohydrates about 30%, as well as appropriate amounts of vitamins, minerals, cellulose and so on. The feed should be palatable, and the particle size should not be too large or too small. Generally, it would be better to use the fish mouth fissure with 1 stroke 2. The fish species were not fed within 2 days to adapt to the cage environment; after 2 days, the fish were fed 5-6 times a day, scattered evenly in the whole box, and the Sturgeon liked to eat pellet feed after 7 days. Enter the normal feeding stage, feed 3 times a day, at 7-8 a.m., 11-12:00 and 6: 7 p.m., each feeding for 15 minutes for 20 minutes. Adhere to the principle of "four determinations" and the feeding method of "a small number of times". Make sure every fish can get feed. Daily feeding amount: the water temperature below 20 ℃ is 0.5% / 1.5% of the fish body weight; the water temperature is 20 ℃ ~ 30 ℃ / 2% / 15%. It should be adjusted reasonably according to the weather, water temperature, the change of dissolved oxygen in water and the food intake and growth of fish.

Strengthen management

The cage should be managed and protected by special personnel, patrol the box in the morning, middle and evening, keep daily records of air temperature, water temperature, feeding and sick and dead fish, carefully observe the activity and growth of Sturgeon, and raise Sturgeon in separate boxes in time when there are differences in size between individuals. avoid polarization. To ensure the safety of the cage, strictly prevent wind and waves impulse cage, enemy damage cage, sediment sundries pressure cage, and frequently check the cage for holes, if any, timely repair to prevent escaping fish. Wash the cage regularly, usually every 7-10 days, especially immediately after the flood, to ensure that the exchange of water inside and outside the box is smooth. Seriously grasp the prevention and control of fish diseases, usually found that there are dead and injured fish should be fished along with them, to prevent pollution or mutual cross-infection. Every 20 days, 15 grams of quicklime and 0.3 grams of dibromohydantoin per cubic meter of water are sprinkled on the cage water body and nearby waters to prevent fish disease. If parasitic diseases such as rotifer, oral filariasis and tongue cup worm occur, the whole box of water can be sprinkled with 2 grams of potassium permanganate per cubic meter of water; if bacterial enteritis occurs, 0.2% dysentery or allicin can be added to the feed for 5 days continuously for 6 days, and the control effect is good.