Fish pond pooling lobster technology
I. Fingerling pond selection and preparation
1. The pond area is preferably 5 to 8 acres, preferably rectangular, with a depth of 2 meters, and the pool surface is well ventilated. Adequate water sources, convenient drainage and drainage, adequate water supply for the pond's water sources, timely water supply, and no industrial pollution and pesticide pollution. The water quality meets the requirements of pollution-free food and freshwater aquaculture water quality (NY5051-2001) as stipulated by the Ministry of Agriculture. Every 5 to 10 mu of water is equipped with an aerator.
2. Clear pond disinfection Summer flowering 20 days before stocking, drain the pool water, level the bottom of the pool, and repair the pool. Use 75kg of lime per acre. Sprinkle the entire pond and disinfect the pond. Thoroughly kill predators such as blackfish, squid, water snakes, and frogs, as well as pathogens and parasites.
3. Cultivating water quality One week before summer flowering, the water in the pool is 50cm high, about 200kg of cooked manure is applied per acre, and plankton is cultivated to provide palatable food for fish and shrimp.
4. Transplanting plants As the saying goes, "How much shrimp do, look at aquatic plants? Planting plants can be in shallow water around the pond. The area of ​​artificially cultivated plants does not exceed 30% of the area of ​​the pond. Plants for cultivation include Elodea and Water Lilies. , water peanuts, bitter grass and so on.
5. Anti-escape facilities along the pool surrounded by wood piles as a scaffold, using asbestos tiles to build a 50cm high escape wall, buried in the bottom about 30cm cm.
Second, fish and shrimp seed stocking
1. Shrimp seedlings are generally placed in mid-to-late April, and about 10 to 15 kg of crayfish with a size of 200 tails per kg are placed per acre. The shrimps require a strong constitution, no disease, no injury, and strong activity. Shrimp seedlings and wild shrimp seedlings grow fast, with high survival rate and high population yield. Before stocking, they were washed with 3% saline for 5-6 minutes to kill parasites and pathogenic bacteria.
2. Summer flowering In June, 3,500 silver crucian carp were placed per acre in June, 1,500 in daylight in summer and 450 in summer in summer.
3. Do not stock carnivorous fish, such as black fish and squid, in the nesting pool. Grass carp and carp that feed on aquatic plants should not be put in more.
Third, the bait feed
The cultivating lobsters in the fingerling pools can make full use of the natural foods in the fingerling pools. In order to increase the market size and population output of the lobsters, they should be supplemented with artificial baits. Lobsters are omnivorous and bulimia. Feeding of bait should adhere to the principle of “two fine, middle green†and the four feeding principles. In the early stage of cultivation, animal-based and lobster-specific grain baits are mainly fed, and in the high-temperature season, plant-based baits such as wheat, corn and aquatic plants are mainly fed. In order to avoid competition with fish species, they are usually fed twice a day. According to the law of lobster activity, they are mainly fed in the evening, accounting for 70% of the total feeding amount. They are put into the deep water area in the morning and put into the shallow water area in the evening. The amount is 4% to 6% of the pool lobster.
Feeds for pellets require no mildew, no pollution, and no toxicity. They must not add banned additives and antibiotics. Green fodder should be provided with a fixed food table. The feed should be tender, fresh and palatable. After being sterilized, the feed should be fed. Disinfection should be carried out once a week near the food table, and the residual bait should be removed in time in order to avoid deterioration and deterioration of the water body. Feeding of bait should pay attention to the weather, when it is sunny, it is more likely to be cast, high-temperature hot, hot and rainy days, or when the water quality is too strong, less investment is required.
The fish were fed and fed according to normal breeding methods. Do not sprinkle the powdered bait directly into the pool, making it difficult for fish and shrimp to feed. This not only wastes the food but also pollutes the water quality.
Fourth, adjust the water quality
Adjust water quality. In the aquaculture process, when the temperature in early spring is low, the water level can be lowered and the water depth can be kept between 30cm and 60cm so that the water temperature can rise quickly and promote the rapid growth of fish and shrimp. Afterwards, as the temperature rises gradually, the water level can be increased gradually. In the summer hot season, keep the water depth at 1.5m to 2m. If the water level is too low during high summer temperatures, it will accelerate the gonad development of lobsters and cause early maturation of the prawn, resulting in small individual shrimps. During the general culture period, the dissolved oxygen in the water is kept above 5 mg/l.
If a lot of lobster climb out of the water during the day when the weather is clear, it is proved that the water body has been deprived of oxygen and it is necessary to add new water or turn on oxygen in time. Observe changes in water quality regularly to keep the water quality in a state of fatness, livelihood, tenderness, and coolness.
Regular use of quicklime to regulate water quality, increase the calcium in the water, and facilitate the growth of lobsters. In the high season of fish and shrimp, it is applied once every 15 days to 20 days. After every 10~15kg of calcined lime, it is turned into mortar and spread all over the pond. .
V. Daily management
Do a good job of patrolling the pond. The focus of the patrol pond is to observe the activities of the shrimp, the changes in the water quality and the weather conditions. When visiting the patrol pond, we must also do a good job of preventing theft, antagonizing the enemy (frogs, rats, snakes) and other work.
Timely fishing. After shrimps are released for 30 to 40 days, they can start to catch shrimp with a size of 8 cm or more. Using cages and other cage-type fishing gear, no damage is caused to the fish and shrimp, and the fish is caught and kept in small quantities. When the conditions permit, shrimp species can be added according to the situation of the pond.
In the prevention of pests and diseases, fishery medicines that are harmful to lobsters should not be used, and special attention should be paid when using insecticides.
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