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Intensive propagation of green shrimp
Green shrimp ponds, cages, paddy field scale breeding and large surface water propagation require a large number of high-quality shrimps. Therefore, artificial shrimp breeding under artificial control conditions is of great significance in production. Over the past few years, the author has conducted in-depth research on broodstock breeding, breeding, and seedling raising of young shrimps, simultaneously carried out demonstration and promotion of comparative scale, and achieved satisfactory results and economic benefits. The technology is summarized as follows. First, the preparation of breeding ponds Conditions for breeding ponds The area for breeding ponds of shrimp is 0.2 to 0.3 hectares, with a water depth of 1.0 to 1.2 m. The slope ratio of the pond is 2.5-3.0:1, and it is set at the outlet: Set shrimp pond 20m2-30m2. Greening ponds should be selected from areas with sufficient water, fresh water and no pollution, and convenient drainage and irrigation. 2. The rearing of the breeding pond is carried out 1 month before the breeding of the shrimp, including pond dressing, remodeling, and drying. The first 15 days before the hatching of the broodstock, the pond is first filled with water about 10 cm, and the pond is disinfected with quicklime at 200 kg/mu. 5 days to 7 days after clear pond, the water level starts to be about 80cm, and the water inlet and outlet are filtered with double layer 80 mesh to 100 mesh sieve to prevent wild fish, frog eggs and other predator organisms from entering the breeding pond. . Second, the food culture of food organisms The abundance of food organisms is the key factor in breeding the survival rate of young larvae. The rich food organisms provide the ideal open bait for the development of the larvae of the shrimp, and its nutritional value is more comprehensive than the artificial feed. And can reduce the bottom sediment pollution, keep the water fresh, therefore, in the first 5 days to 7 days after the broodstock broodstock, breeding ponds should be applied after fermentation of organic fertilizer 300kg/Mu - 500kg/mu. Third, the selection and breeding of broodstock 1. Selection of broodstock Prawns for prawn broodstock broodstock is generally caught in large water surfaces such as lakes, reservoirs, ditches, and ponds in mid-to late May. Select lively females with complete limbs, body lengths up to 5 cm, and mature or nearly mature female ovaries as broodstocks. Ovary volume covers almost the entire back, the front end reaches the base of the forehead, and the egg's color is green or orange (if The color of the egg is gray-brown and appears eye spots, indicating that the egg has hatched and is easily detached from the mother, which is inconvenient for transportation and operation). The amount of stock for broodstock brooding is 8 kg mu ~ l0/kg mu. 2. The breeding practices of shrimp seedlings have proven that the cultivation of brooding broodstock and zoea larvae is better performed with a small area of ​​intensive cultivation. The specific operation method is to use a polyethylene mesh with a mesh of 0.5 cm and a height of 1.2 m. The bottom of the mesh is buried in the mud and compacted. The fence is in the corner of the pond. The area is 50m2 to 60m2. Water plants such as water hyacinth, water peanut and other fresh aquatic plants are placed along the one week of the fence to occupy the water surface in the fence. 20% - 30% of the brooding broodstock will be placed in the fence to cultivate. After the broodstock is released, check the development of the shrimp eggs every day. After the pods are completely detached from the mother, use brood cages and other fishing tools to remove the prawn from the market. At this time, press 150kg/mu-200kg/mu in the cultivation pond. Into the fermented organic fertilizer, continue to cultivate the bait's food organisms. The larvae in the seine nets are bred with cooked fish and egg yolks, and the oysters and egg yolks are filtered after being filtered with 60 mesh to 80 mesh sieve. Four times a day, 0.5 kg of fresh fish per 10,000 shrimps And 2 egg yolks are fed. The larvae have been intensively cultivated for a week, and their body length has reached about 0.5cm. The segregation nets can be gently removed for seedling cultivation. The seedlings were changed to fish and egg yolk as soybean milk in the early stage of cultivation. Each day, 3 kg of soybeans were used to grind the soybean milk into 3 batches of feed. After 15 days of cultivation, the length of the shrimp seedlings was about 1 cm, except for the daily soymilk feed. Increase the feeding rate of feeds and feeds. The feed volume accounts for about 5% of the body weight of the shrimps. It is fed twice a day. The amount of feed in the morning accounts for 20% of the total amount of feed, and the amount of feed in the afternoon accounts for 80%, along the pool. The shallow water area is fed at multiple points. IV. Water Quality Management Water quality management of shrimp breeding is mainly to ensure that there are abundant food organisms, adequate dissolved oxygen, and appropriate pH. It takes 35 days to 40 days for larvae to grow to 1.5cm to 2.0cm in length. During stock culture, the stocking density is high and the water quality is variable. Water quality, transparency, and the eating and feeding of shrimp should be used to timely adjust the water quality. Scientific management of water quality. 1. Timely and appropriate fertilization and water injection and drainage are required to control the water body fat of ponds. At the same time, it is necessary to meet the growth needs of shrimps to feed on natural food organisms. Under normal circumstances, shrimp cultivation ponds are fertilized 2 to 3 times a month, each time. Organic fertilizer 150kg-200kg, and timely injection and drainage according to the transparency of the pool water. The water depth of the ponds in the late growth period of the penaeid shrimp needs to be added to 1.0m-1.2m to ensure that the growth of the penaeid shrimps grows in a good environment. 2. Adjusting the pH value of the water The fresh shrimp live in a slightly alkaline water body. With the input of artificial diet and organic fertilizer, the pH of the water slowly decreases. The pH of the water should be tested once a week. If the pH is less than 7.0, then With quicklime 5kg/Mu Quanchiposa, it not only plays a role in regulating water quality and promotes the growth of larvae, but also plays a role in disease prevention. V. When the shrimp seedlings are harvested for 1.5cm to 2.0cm, the stocking densities of the seedlings in the nursery ponds are already quite large. In order to increase the emergence rate per unit area, the ponds and shrimps should be harvested in time. Tools can be used to gently pull out the fish seedlings net, can also be based on the characteristics of clustered light orientation of the shrimp seedlings, light trapping, using a 30 mesh -40 mesh sieve made of a triangular hand-printed nets, repeated in the pool copy.