The scientific name of the river shrimp is Japanese giant shrimp, also known as green shrimp. The artificial cultivation techniques of river shrimp seedlings are as follows:
1. Selection and retention of broodstock is selected as artificially propagated broodstock, requiring body shape standards, pure body color, plump and strong, disease-free and no injury, good gonadal development, female body length is over 6cm, male Specifications are bigger. It can be selected from naturally harvested prawns, or it can be selected from artificially cultivated ponds. The selected broodstock should be stocked. The broodstock pool area is 1-3 mu and the water depth is about 1 meter. Before hatching, broodstock should be sterilized strictly, and the inlet should be sealed with a tight mesh to prevent wild fish and other predators from entering. Generally 1 mu of water can store 5-10 kilograms of broodstock. After the broodstock enters the pool, it is necessary to strengthen the management of feeding and feeding once every two days, so that the shrimp can accumulate nutrients in large quantities, promote gonadal development, ovulate early, and lay a good foundation for successful artificial breeding.
2. Spawning and incubation Hatchery spawning and hatching can be carried out in cages (incubators). Shrimp are also cultivated in the same cage. The cage material can be made of polyethylene mesh cloth, with a mesh size of 196 mesh/cm2, and a synthetic cage is sewed. A 3X15 polyethylene chain rope is installed in the bottom of the box and the upper mouth of the box. The box is rectangular and the specification is 10 meters X6.67 meters X1.7 meters. Installed into an open-floating type, the cage has 0.3 meters exposed to the surface to prevent escape. Put 2-3 square meters of plants in the box and put it into the hatchery wooden cage 1-2. The size of the incubator is 1.7 meters X1 meters X 0.5 meters and the mesh is 12 mesh/cm2. The four corners of the incubator were hung with one brick to expose the tank to a surface of about 5 cm. In early March, the winter broodstock began to feed. Feeding increased as the water temperature gradually increased. At the beginning of April, the daily feeding amount can be increased to 4%-5% of the weight of the broodstock. Let river shrimp fatten, mating, and spawn in wintering ponds (boxes). Egg-feeding females used for cage propagation require the eggs to begin to show compound eyes. Each cage holds 700-1000 female eggs. When the hatching box is incubated by the manager for 6-7 days, the larvae can break the membrane and leave the brood. At this point, the hatchery can be taken out of the incubator along with the hatched females.
Spawning and hatching can also be performed in spawning ponds. Spawning pond area should be 1-3 acres, water depth of 1 meter or so, the required pool slope without weeds, good ventilation, flat bottom, convenient drainage, and pre-shrug disinfection of shrimp ponds.
3. The feeding and feeding of cage shrimp seedlings should start from the day when the larvae are put into the incubator from the incubator and use 0.5-1 kilogram soy beans per day. After immersing in water, grind the juice, remove the bean dregs, and feed them once in the afternoon and in the afternoon and pour them in the incubator. When the larvae grow to about 2 cm, they must add a small amount of buckwheat flour or bran while pouring soy milk. The water quality inside the box must be good and the transparency can be controlled within 25-35 cm. After 25 days of cultivation, the young shrimp can be Restocking specifications.
4. Cement ponds and earth pond shrimps Cultivation of cement pools to cultivate shrimp seedlings is the use of indoor tilapia wintering cement pools as hatching ponds for river shrimp. The water source is fresh, unpolluted river water, and the water depth is 80-100 cm. The water temperature is Above 20°C. The broodstock that had been preserved in the previous year (occupied shrimp) was placed in a cage (100 cm, 50 cm, 50 cm) in the hatchery and the stocking density was 300-400 pieces/carton. A small amount of bean cake was fed on time every day, and water and sewage were each fed. When the water temperature was 20-26°C, the shrimps could be hatched after 6-7 days.
The earthen pond cultivation of shrimp is carried out in an outdoor land pool. When the light is good during the daytime, use a 80 mesh cage to remove the larvae and move them to an outdoor earthen pond. Stocking density is 400,000-600,000/mu. For example, if the larvae do not have enough natural food after going to the pool, they must feed some fine soybean milk every day, in addition to cultivating good water quality. After more than one month of cultivation, when the body is as long as 1.5 to 2 centimeters, catching ponds can be picked up for shrimp culture.
The river shrimp and river crab are polyculture. Each year, crabs and young shrimps can be released in March. There are 550-600 crabs (150-200 pieces per kilogram) and about 18 kilograms of young shrimps (each specifications). 1600-1800/kg). In spring, during the small-scale growth period of crabs, the main focus is on shrimp culture, ensuring that more than 35 kilograms of commercial shrimp can be caught per acre in June, while river crabs also have enough water space and growth is not affected.
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