After winter fish species and ponds, the use of free fish ponds to grow fish, develop shrimp culture, and plant forage grasses can improve the comprehensive breeding efficiency of fingerling pools.
The adult fish are mainly reared to reach the listed fish, and they are encouraged to grow by strengthening feeding. After the fish species pooled, the pool water was immediately drained to remove excess silt. Each mu was sprayed and disinfected with 100 kg of quick lime. Five days later, fresh river water was poured in, and 100 kg to 200 kg of organic fertilizer per acre was applied to fertilize the water. The mussels raise 200 kg to 250 kg of fish, the water temperature is above 4°C, and they are fed once a day. The amount of feed is 2%~3% of the amount of feed, the water temperature is below 4°C and every 2 days~3 days. Once, the amount of bait is 2%. The bait is mainly based on high protein content and easily digestible bait, such as vegetable cake, bean cake, and grain bait. Maintain a water depth of more than 1.6 meters during the maintenance period, change the water at noon every 10 days to 15 days, change the water volume every time is 1/4~1/3 of the pool water, pay attention to the water temperature difference can not exceed 2 °C ~ 3 °C, and maintain the water temperature The water level is stable. Sprinkle lime water every 20 days to disinfect water bodies and prevent fish diseases. During the cultivation period, the prevention and control of water mildew must be done well. When fish species are stocked, they should be soaked in 4% saline solution for 5 minutes to 10 minutes, and they should be sterilized and sterilized. Through three to four months of support, the fish can produce more than 150 kg of fish per mu.
After cultured shrimp and fish ponds, no fresh fish ponds are needed, and fresh river water is directly injected into the river. The amount of organic fertilizer produced per acre ranges from 100 kg to 200 kg, and plankton is cultivated to maintain a water depth of 1.3 meters or more. The specifications for rearing fresh shrimp per mu range from 2 cm to 2.5 cm per tail. Green prawns can ingest growth throughout the winter, and they need to catch two on feeding, with the middle, that is, feeding the fish, snail meat, and grain bait for 20 days after stocking. It is 3% of the amount of shrimp in the pond. January to February every 3 days to 4 days choose to feed some amount of feed at noon, in March once a day feeding, feeding amount can be increased to 4%, in April with the temperature rise, the shrimp increased food intensity, feeding The amount can be increased to 6%. In May, the fastest growing stage of shrimp, the amount of feeding can be increased to 8%, feeding 2 times to 3 times a day. During the cultivation period, we must strengthen water quality management. Every 10 days to 15 days, we must change the water at noon and change the water every time by 20 cm to 30 cm. We should keep the water temperature and water level stable and have a transparency of 20 cm to 30 cm. If the water level is too shallow, it is necessary to make proper water supply to prevent frostbite from freezing and freezing and the water quality is too fat. Change water in time to prevent the shrimp from suffocating due to lack of oxygen. The water quality is too thin. Appropriate fertilizer should be applied. Sprinkle 20 kg of lime per acre on every 15 days to disinfect the body of water, increase calcium, and promote the growth of shrimp. If you find that the green shrimp has a bath type, you can splash 0.7ppm copper sulfate in Quanchipia and change the water after 3 days. By the end of May, the size of most of the shrimps will reach 5 cm or more, and shrimp can be sold in dry ponds. Generally, 15 kg to 20 kg of shrimp can be produced per mu.
Planting forage grasses and winter fish ponds can also use the bottom of the planting ryegrass, which can provide feed for adults and can also be used as the base fertilizer for the original fish ponds. Ditch the water, timely sowing. After the fishes come out of the pond and drain the water from the pool, dig trenches around the pool and dig a trench every 2 meters to filter out the pool water. Sludge can be sown in semi-dry and semi-humid form, with 1.5 kg to 2 kg per acre, as early as possible sowing early germination, high emergence rate. Strengthen management to prevent waterlogging. Seedlings emerge from 5 days to 7 days after sowing. When the temperature rises above 15°C, it grows rapidly and part of the fertilizer is applied. Before the rainy season of the following year, clear the drainage ditch in advance and prepare for anti-spotting. Timely cut green, fish into the water. In April of the following year, the first cut was made in order to make up for the lack of green feed for spring fish. After that, it is cut green every 20 days or so, and then it is sowed about 20 days before the summer fish species are stocked. Some duckweed and summer flower ponds have ample palatability feed.
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