The use of plastic greenhouses to heat up and raise large eye larvae to five young crabs is a good way to improve the survival rate and stocking size of crab seedlings. It has the characteristics of less land occupation, small investment, quick effect, easy management, and large profits. My field began to cultivate big eye larvae from 1955 and accumulated some successful experiences. Now the main technical points are introduced as follows:
First, the cultivation pool selection and construction of young crab cultivation pool should generally choose to shelter in the sunny, quiet environment, adequate water sources, earthen ponds as well. The size of the pond can be determined according to the scale of cultivation. Generally, 60-1000 square meters is more suitable, the pool is rectangular, the depth is 1-1.5 meters, and the slope is slightly larger than the slope of the aquarium, and the water level is between 0.5-1.0 meters. , Using piles of wood and bamboo and other materials to set up large sheds on the pool, cover the sheds with agricultural film, and compact the four surrounding feet.
Second, seedlings stocking selection of authentic use of the Yangtze River water crab breeding out of the seedlings, in the breeding ground after a full desalination, salinity reached between 3-2% 0, seedlings specifications neat, physically robust, disease-free without injury, with The hands can be quickly dispersed after being held in groups, and the amount per kilogram is between 12-1160 thousand. The stocking density per mu is about 400,000.
Third, water quality management big eye larvae into the pool before the week to properly fertilize water quality, increase water plankton content, water temperature remained above 18 °C, the temperature difference in the short term changes shall not be greater than 2 °C, PH value is generally between 7-8 . When the larvae enter the pool, a reasonable amount of fresh water is added. The amount of water exchanged per day is more than 1/3, and the time for changing the water is usually selected at noon. Sprinkle lime regularly to improve water quality and increase calcium ion content in the water. Smaller pools of water should be equipped with flushing pumps.
Fourth, reasonable feeding of large eye larvae into the cultivation pond, the water should have a certain amount of plankton, aquatic peanuts, water hyacinths and other aquatic plants covered by more than 1/3 of the total surface area, egg, fish and other miscellaneous animals The daily feed amount of the feed must account for about 200% of the larvae's body weight in the first few days, and it should be fed once every 2 hours. After entering the Phase I juvenile crab, the daily feed volume will be reduced to 50-80%, and the number of daily feedings will be reduced. 3-4 times, the feeding point should be set on the shallow water area near the water surface or the grass in the pool, more uniform feeding, add appropriate amount of locust.
V. Prevention and control of diseases The large eye larvae must be completely cleared in the clearing pool before entering the pool, and often keep the water fresh. The enemy organisms and frogs, water snakes and water mice must be completely removed. If it is found that malachite is splashed with 0.1ppm of malachite green, it is repeated 3-5 days later. It was found that soft-shell disease increased feeding of fish meal, and parasitosis such as crab slaves and bryozoans was splashed with 0.5ppm copper sulfate solution. For ciliate disease, 30% formalin 5 to 10 ppm Quanchiposa can be used, and if necessary, repeat l-12 times.
First, the cultivation pool selection and construction of young crab cultivation pool should generally choose to shelter in the sunny, quiet environment, adequate water sources, earthen ponds as well. The size of the pond can be determined according to the scale of cultivation. Generally, 60-1000 square meters is more suitable, the pool is rectangular, the depth is 1-1.5 meters, and the slope is slightly larger than the slope of the aquarium, and the water level is between 0.5-1.0 meters. , Using piles of wood and bamboo and other materials to set up large sheds on the pool, cover the sheds with agricultural film, and compact the four surrounding feet.
Second, seedlings stocking selection of authentic use of the Yangtze River water crab breeding out of the seedlings, in the breeding ground after a full desalination, salinity reached between 3-2% 0, seedlings specifications neat, physically robust, disease-free without injury, with The hands can be quickly dispersed after being held in groups, and the amount per kilogram is between 12-1160 thousand. The stocking density per mu is about 400,000.
Third, water quality management big eye larvae into the pool before the week to properly fertilize water quality, increase water plankton content, water temperature remained above 18 °C, the temperature difference in the short term changes shall not be greater than 2 °C, PH value is generally between 7-8 . When the larvae enter the pool, a reasonable amount of fresh water is added. The amount of water exchanged per day is more than 1/3, and the time for changing the water is usually selected at noon. Sprinkle lime regularly to improve water quality and increase calcium ion content in the water. Smaller pools of water should be equipped with flushing pumps.
Fourth, reasonable feeding of large eye larvae into the cultivation pond, the water should have a certain amount of plankton, aquatic peanuts, water hyacinths and other aquatic plants covered by more than 1/3 of the total surface area, egg, fish and other miscellaneous animals The daily feed amount of the feed must account for about 200% of the larvae's body weight in the first few days, and it should be fed once every 2 hours. After entering the Phase I juvenile crab, the daily feed volume will be reduced to 50-80%, and the number of daily feedings will be reduced. 3-4 times, the feeding point should be set on the shallow water area near the water surface or the grass in the pool, more uniform feeding, add appropriate amount of locust.
V. Prevention and control of diseases The large eye larvae must be completely cleared in the clearing pool before entering the pool, and often keep the water fresh. The enemy organisms and frogs, water snakes and water mice must be completely removed. If it is found that malachite is splashed with 0.1ppm of malachite green, it is repeated 3-5 days later. It was found that soft-shell disease increased feeding of fish meal, and parasitosis such as crab slaves and bryozoans was splashed with 0.5ppm copper sulfate solution. For ciliate disease, 30% formalin 5 to 10 ppm Quanchiposa can be used, and if necessary, repeat l-12 times.
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