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Strict choice of broodstock, good quality shrimp broodstock germplasm quality, directly determines the success or failure of shrimp culture. In the traditional shrimp breeding, the egg-holding shrimps in the ponds are generally selected directly from the culture ponds as broodstock. Because the shrimps are bred by multiple generations, their relatives are mated and their dominance is degraded, affecting the seed quality. Therefore, from the improved varieties of manpower, the wild shrimps in healthy, high-quality large-water areas are selected as the parent of the shrimps. The shrimps have undergone a process of natural selection and have maintained the excellent traits of the varieties, with large individual specifications and strong resistance to stress. Rapid growth and good quality. In the artificial breeding of shrimp seedlings, pollution-free seedling breeding techniques should be adopted. The standards for the cultivated shrimps are: bright and translucent body color, healthy and lively body, strong jumping force, complete appendages, no disease, no injuries, neat specifications, and good quality of this species. Traits.
In combination with the local reality, there are many ways to choose different stocking modes. There are many kinds of culture methods for the green prawns, which can be adapted to local conditions and choose a suitable stocking mode for local production.
Shrimp - fish polyculture. It is possible to use polycultures that are not harmful to shrimps and shrimps. Such as 鲢, 鳙, 鲂, silver 鲫, grass carp and so on. Over 20,000 species of wintering shrimp are put in the mu, and after 2 months, the shrimp can be caught with fishing nets such as shrimp cages and caught in large catch. Without affecting the yield of fish, the mu will increase production of about 30 kilograms of shrimp and increase income by more than 500 yuan.
Green prawn farming. Due to the rapid growth of the shrimp, the ponds can raise only two eggs a year. Spring prawn was released in February and 30,000 prawn species were planted in 1,000 mu/kg. Autumn oyster shrimps are planted at the beginning of August, and 60,000 prawn species with a size of 8,000 larva/kg are put in the mu. As long as the management is strengthened, timely harvesting will be carried out, and the yield per mu will be more than 100kg, and the net income will be more than 1,500 yuan.
Green shrimp - crab polyculture. There are 500 crabs with 120 sticks/kg and 200 sticks of wintering shrimp with specifications of 2000/kg. After careful management, more than 100kg crabs with a specification of 150g or more can be produced. More than 40kg per mu of shrimp produce more than 2000 yuan per mu.
Planting appropriate amount of aquatic plants to create a suitable ecological environment Green shrimp is a crustacean with shelling and mutual disability. When mixed with other aquatic products, shelled shrimp is the target of other aquatic products. In order to increase the survival rate of the shrimp and promote the growth of the shrimp, a certain amount of concealment must be set in the water area for the cultivation of the shrimp. From a practical point of view, aquatic weeds are the best concealment of freshwater shrimp. Green prawns can inhabit, cling, shell and feed in aquatic plants. Aquatic plants can absorb inorganic salts and other substances in water bodies. Water plants increase the dissolved oxygen in the water through photosynthesis. In the high temperature season, the plants can also shade and cool, providing a quality living environment for the shrimp. There are two types of aquatic plants grown in production: one is water peanuts, water spinach, water lettuce, etc., planted in the shallow water zone near the pool; the other is submerged plants such as Vallisneria alternifolia At the end, the area of ​​aquatic plants accounts for 30% of the water area.
Adhere to the four-shot feeding, to meet the nutritional needs of shrimp paste Cultured shrimp to feed the full price with granular food as well, followed by a variety of raw materials crushed mixed bait, should not only feed a single bait to meet the green shrimp The need for nutrition. The crude protein content of the pellets should be above 30%, the particle size is generally 1.5-2.2mm, and the palatability of the bait should be maintained. The raw materials of the mixture may include bean cakes, peanut cakes, bran, rice bran, small junk fish, fish meal, blood powder, etc. The finer the crushed, the better the stability of the binder. For feeding animal feeds such as snails, clams and cockroaches, they must be crushed and re-cast. Normally feed 2 times a day, feed 1/3 of the daily feeding amount in the morning, and feed the rest of the bait before and after 5 pm. The daily feeding amount is controlled at 3%-5% of the shrimp body weight, and the bait should be evenly distributed at a fixed point. The plants on the bank of lm should not be placed on the surface of the water to facilitate the feeding of shrimp. The specific feeding amount also needs to be flexibly controlled according to the weather, water quality, water temperature, season, shrimp growth, and feeding conditions.
Strengthen water quality management and do a good job in water quality management of disease prevention is an important part of the cultivation of shrimp. The requirements for water quality of the shrimp are high, and effective measures must be taken to control the water quality so that the transparency of the water body is kept at 35-40cm, dissolved oxygen is above 5mg/L, and the PH value is 7-8. The main measures are: timely injection of water, water level control at about 1.2m, flexible use of oxygen aerators to maintain adequate dissolved oxygen; regular spillage of lime water (10-15ppm); timely application of photosynthetic bacteria and other microbial agents; regular on the food market Sterilization, etc., create a good ecological environment for the growth of shrimp. In the case of diseases of shrimp, it is important to stick to the prevention and do a good job of disinfection to prevent shrimp disease. Once a disease has occurred, the cause of the disease is immediately identified, and the right medicine is prescribed and treated promptly.
How to increase the yield and effectiveness of the shrimp
The growth rate of shrimp is high, the breeding cost is low, the market demand is large, the sales season is long, and the production efficiency is good. It is one of the high-quality varieties of structural adjustment of aquatic products. In recent years, the development of the shrimp aquaculture industry has been constrained by factors such as degradation of the germplasm of the penaeus, reduction of individuals, premature sexual maturity, and serious diseases. The author believes that the following technical measures can effectively increase the yield of shrimp culture. With benefits.