Japanese shrimp is a wide-temperature shrimp, in recent years, the rapid development of the northern coastal areas of China, the scale of breeding continues to expand, in some areas, Japanese shrimp has become the dominant species of shrimp culture. However, in actual aquaculture production, the survival rate of shrimp culture in Japan is relatively low, which has become a limiting factor in improving shrimp aquaculture efficiency. The author believes that the following issues should be noted for reference when breeding Japanese shrimp in shrimp ponds. First, salinity. Japanese shrimps require higher salinity and lower salinity tolerance, requiring an optimal salinity of 23-47 â€°. China's prawns are broad-salt shrimps, and their salinity requirements are not high. Some shrimp ponds have low salinity, and individual areas have less than 15 pounds of water salinity. If the Japanese prawn are stocked, it will inevitably lead to a low survival rate of Japanese shrimp, which is the main reason for the low survival rate of Japanese prawn in the shrimp pond culture. At the same time, we must master that the difference between the indoor salinity of the nursery and the salinity of the shrimp pond should not be greater than 5 inches. Second, the bottom quality. Japanese prawns have a strong diaspora habit. Therefore, the bottom of shrimp cultured in Japanese shrimp must be sandy. If it is argillaceous or fine sand, Japanese shrimp cannot be infiltrated because the bottom of the pond is hard or the bottom particles are fine. Even if it is sneaked in, the bottom sediment may be easily polluted due to poor permeability or permeability. Prawns breathe, making them unable to inhabit and live. If a prawn pond is selected to culture Japanese shrimp, it should be transformed. However, the argillaceous shrimp ponds should not be converted into Japanese prawn rearing ponds. This is because soft argillaceous sediments are mixed with sediments, which makes it easy to cause breathing difficulties in prawn that infiltrate into the soft mud, resulting in death. Therefore, Japanese shrimp can only be cultured after the transformation of the hard muddy shrimp pond. The specific method is to fill sand in the pool. Filling sand can be filled in the whole pool, or sand and sand piles can accumulate at the bottom of some pools. Even sand filling, sand layer thickness of 10Cm or so; sand pods should be in the pool line, parallel to the direction of the inlet and outlet, uniform spacing, bottom width 1-2m, height 50-60Cm; sand should also be uniform distribution, conical, diameter 1- 2m, high 50-60Cm. The number of sand ploughs depends on the amount of seedlings, and is calculated as 60-100 tails per square meter of surface shrimp. Third, the temperature. Water temperature should be kept above 15Â°C, and the temperature difference between nursery ponds and culture ponds should be less than 5Â°C, preferably within 3Â°C. The breeding units and individuals who reared Japanese shrimp larvae for early-grooming should not only master the water temperature in the breeding ponds, but also have a good grasp of the water temperature difference between nursery ponds and culture ponds. The conditions are best maintained in plastic greenhouses to avoid sudden changes in the early spring air temperature caused by sudden changes in the outdoor pool. Fourth, harvest. The Japanese shrimp harvest should be harvested in a timely manner according to the growth conditions, market requirements, water temperature changes, and market demand. However, when the temperature of the water drops to 10Â°C, about the end of October, all Japanese shrimps should be harvested. Otherwise, it will affect the aquaculture efficiency of Japanese shrimp.
Propolis Extract,Bee Glue,Bee Propolis Extrac
Standard Herbal Extract Co., Ltd. , http://www.chaoshenbao.com