Into the holding of winter shrimp
The purpose of raising the shrimp can be staggered during the sales season, sold at the price, and raise the breeding efficiency. The location can be close to the water source, no pollution, convenient drainage and drainage, and it can be near lakes and ditches with relatively abundant shrimp resources. The area is 3 mu~5 mu, the slope ratio is 1:2.5~1:3, the silt depth is l0cm~20cm, and a 0.5m wide and 5m deep shrimp ditch is excavated in the middle of the pool. Dig a shrimp tank that is 0.5 meters deep, 3 meters wide, and 5 meters long. The inlet and outlet are filtered with a double-layer filter to prevent the escape of the shrimp and the entry of predators.
Before 10 days of shrimping, 100 kg of lime was used per acre. The dry clear pond was used to disinfect and sterilize. After 5 days, water was poured into the pond. The water grass, branches, and discarded mesh sheets were evenly distributed in the pond. The coverage rate was over 50%. Green shrimp inhabit, dodge.
Time shrimp can be raised around the end of November, when the shrimp shelling less. Generally, 150kg to 200kg of green shrimp are placed on the mu, requiring strong physique, uniform specifications, strong bouncing power, complete appendages, and no disease-free injuries. The specification of the temporary raise is required to be more than 4.5 centimeters per tail. If the specification is too small, it will affect the survival rate of holdings. Should pay attention to the specifications can not be too different, the difference is too large to hold the pool holding, otherwise the shrimp will be bullied small, while not conducive to sales. At the time of stocking, it is required to let go once and avoid stocking in batches.
Day-to-day management has the following measures: Feeding Green prawns can feed on the whole winter, so stick to feed, and the amount of feed is 3% to 5% of the pond's weight. When the water temperature is lower than 5°C, it usually takes 2 days to 3 days to feed the bait one time, and it is recommended to feed some feed at an appropriate time on the warm day in the eye. When the water temperature is above 5°C, the feeding is continued every day, and the bait is mainly based on animal foods, supplemented by plant foods. Animal foods include: chopped small fish, shrimp, quail meat, animal organs, etc., plant foods are bean cakes, wheat bran, cakes, etc.; can also feed the shrimp feed pellets. The bait is placed in a shallow area with aquatic plants around the fishing pond.
The water quality management holding pool requires water depth of 1.5 meters or more to maintain a relatively high water temperature and maintain a certain degree of water body fatness with a transparency of 20 cm to 30 cm.
During the holding period, if ice is found on the surface, it is necessary to break the ice in time to prevent the death of the shrimp due to lack of oxygen and suffocation due to icing on the surface. Normally, the number of water changes and the amount of water to be changed are determined according to the concentration of water.
When water is injected, it should be selected at about 11 o'clock in the morning when the weather is warm and sunny, and when the water temperature of the river is close to the water temperature in the shrimp pond, avoid excessive temperature difference and keep the water level stable. If the water level is too shallow, it must be replenished in time to prevent the frozen shrimps from being frostbite and freezing to death. The water quality is too thin and fertilization should be applied properly.
Disease prevention during the holding period, generally few diseases, but to do a good job of shrimp disease prevention. Splash lime once every 15 days to sterilize the water body, remove the bait, debris, dead shrimp, etc. in the pool every day to keep the pool mouth clean and hygienic. When it was discovered that there was algae parasitism in the shrimp, it was possible to splash 0.7ppm copper sulfate in the whole pool and change the water after 3 days of administration.
Fishing shrimp fishing tools include: cages, shrimp, shrimp trawl nets, etc., when more than 70% captured, let go of the pool water, the shrimp will be introduced into the shrimp tank, dip nets to catch, small specifications can continue to raise For a period of time, fishing sales will be made when the specification is reached.
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