The pond cultivation techniques are now described as follows:
Biological characteristics The shrimp is a tropical shrimp, the survival temperature is 6-37 °C, the optimum growth temperature is 22-32 °C, the appropriate pH value of 6-8. Dissolved oxygen above 4 mg/l. Fear of strong light, hi light, and frequent night activities. Is omnivorous shrimps, which are similar in the lack of food. Feeding bait under captive feeding conditions. The growth rate of shrimp is affected by environmental conditions, especially food and water temperature. The food is rich, the water temperature is suitable, the growth rate is fast, and vice versa.
The preparation of shrimp ponds in the pond requires a quiet environment, plenty of water, and convenient drainage and irrigation. Each pond covers an area of ​​0.07-0.33 hectares (1-5 mu) with a water depth of 1-1.2 meters. The bottom of the pool is flat, with less silt, sandy, and certain shallow water areas. The pool is a gentle slope. More than 1/3 of the pond's water surface is planted with aquatic plants such as black-leaf algae and water peanuts. Piles of rubble or used tires are piled around the pond to provide artificial nests for the shrimp. Around the pond is a 30-50 cm high wall.
Seed stocking should be used for ponds that have been used for many years to remove excess silt, to clear access and drainage channels, and to reinforce dams. Before putting shrimp, use the same method as fish farming to disinfect. In the case of dry ponds, 150-200 kg of lime are applied per 1/15 hectares. After 7 days of disinfection, the drug properties disappeared, and 100-300 kg of fermented manure, such as cow dung and chicken dung, was applied every 1/15 ha. At the same time as fertilizing, fill the pool with water 30-50 centimeters deep and add water to 80 centimeters deep after 5 days. When water is injected, it must be filtered with a dense mesh. Aquatic plants must be temporarily stored and sterilized before they are cultivated to prevent the entry of wild fish eggs and harmful organisms. Shrimp seedlings (species) are generally stocked in mid-to-late May, when the water temperature is stable above 18°C. Care should be taken to select sunny weather. Sun exposure should be avoided during transportation. Should choose physical health, no injuries, consistent specifications of the seed.
Before stocking, the temperature difference between the wintering ground and the shrimp pond should be within 3°C, and the shrimp seedlings should be disinfected with a bleaching powder solution having a concentration of 1 mg/kg. Seed stocking density can be determined according to pond conditions, seed specifications, technical level, etc. as appropriate. In general, the early-community bacteria were 3-5 cm long and had a weight of 1.5 g/tail, and 3000-5000 can be released per 1/15 hectare. The survival rate could reach 60%, and up to October specifications could reach 50-100 g/year. tail. Overwintering shrimp species weighing 10-15 grams / tail, every 1 / 15 hectares can be stocked 2000-3000, the survival rate of 80%, when developed shrimp specifications up to 100 grams / tail or more. The pool can also be used with a certain number of flowers and white fish. In general, 150-200 kg can be produced per 1/15 hectare, and seedlings should be uniformly distributed around the pond.
Science feeding artificial feeding conditions should be fed with artificial diet pellets, fish and shrimp with a proper mix of meat, cereals and vegetables. In the early stage of planting, the protein content of bait should be 30% - 35%, and the particle size should be 0.5 - 0.6mm. In the middle and late stages of development, the dietary protein content is 25% - 30% and the particle size is 2-3mm. In the shallow water area around the pond, there are multiple feeding areas. The daily feeding amount can be gradually reduced with the growth of the shrimp body, and the feeding amount accounts for 3% to 5% of the overall weight of the shrimp. Generally, the feeding amount is 3 times daily, and the time is 6 to 7 hours, 4 to 6 hours, and 9 at night. Time. Since the shrimp likes to feed at night, the night feeding amount should account for about 70% of the total feeding amount. In ponds with many plants and biomass, the feeding amount should be appropriately reduced, and the feeding amount should also be based on the weather and water quality. The situation of shrimp and other activities increase or decrease as appropriate. Since the shrimp likes a variety of foods and does not like to eat a feed for a long period of time, it should be fed 2 to 3 servings of vegetables and small fish and shrimps every week during feeding.
Crab Crab Pond Cultivation Techniques (I)
Red prawn has strong adaptability, large individuals and fast growth. It resembles lobsters, has delicious meat, and has simple farming techniques and high economic value. The shrimp is generally produced at a yield of 100-200 kilograms per 1-15 hectares (1 acre) and can be up to 402 kilograms. The price per kilogram is 40-60 yuan.
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Crabs should control water temperature