How should sturgeon stocking density be controlled to be reasonable?

AbstractThe optimal stocking density for sturgeon is 2-4 kg/㎡, the optimal stocking density for Russian sturgeon can reach 4-5 kg/㎡, the Russian sturgeon has the fastest growth rate among sturgeons, and according to the growth condition of the fish, the stocking density should also be adjusted accordingly. At present, cage culture of sturgeon is the most worthwhile culture method to promote.

Sturgeon stocking density and size

For sturgeon stocking density, 50 fish can be placed per square meter. At the beginning of stocking, use 3 cages, with a total of 5000 sturgeon placed, and the stocking density is distributed evenly. After the sturgeon have been stocked for a period of time, begin to sort the sturgeon according to size to reduce the stocking density.

Suitable stocking density for sturgeon

Experiments on cage culture of sturgeon show that to reach a market fish size of more than 1 kg, the stocking density should not be too high. When the stocking density is around 5 kg/m2, 100 percent of the fish can reach more than 1 kg in body weight.

The bony plates of sturgeon are hard, and when the stocking density is too high, the fish bodies rub and collide with each other and are injured, and the fish become infected and die. Therefore, the optimal density for cage stocking of sturgeon is 2.0-4.0 kg/m2, and the optimal stocking density for Russian sturgeon can reach 4-5 kg/m2.

Selection of sturgeon culture species

From the perspective of production practice in cage culture of sturgeon, the cultured species is very critical. Under the same culture conditions, from the perspective of growth speed and market size, the Russian sturgeon grows faster than the Amur sturgeon, and the Amur sturgeon grows faster than hybrid sturgeon.

At present, the ecological conditions of reservoirs are suitable for the requirements of sturgeon culture. Sturgeon are a relatively cold-water fish. If the water temperature exceeds 25°C, there will be a problem of overwintering. By using the condition that the bottom layer of the reservoir has relatively low water temperature in summer for cage culture of sturgeon, the sturgeon grow very fast. At present, cage culture of sturgeon is a culture model worth promoting.

Feeding of sturgeon

The feed mainly fed in cage culture of sturgeon is complete pellet feed. The feeding amount is determined according to the feeding situation of the fish, and the amount and frequency of feeding are adjusted with water temperature and the growth condition of the fish. At a water temperature of 17-20 °C, the feeding amount is 2.3%-3.4% of the fish body weight. At a water temperature of 21-25 °C, the feeding amount is 4.5%-5% of body weight. Generally, the daily feeding frequency is about 3 times.

Daily management of sturgeon

Check the feeding situation of the sturgeon well every day, check whether the cage is damaged, regularly clean the dirt on the cage, keep the water in the pond fresh and the water flow unobstructed, and adjust the stocking density according to the growth condition of the fish.

Disease prevention and control of sturgeon

Sturgeon have strong defense ability and generally have relatively few disease outbreaks during the culture period. If bacterial enteritis is found, feed medicated bait containing 0.2% furazolidone, and continuous feeding for about 5 days can bring about recovery.