In the first and second seasons, the fish will grow into fish in the first half of the year and breed fish in the second half of the year. In the two seasons of the year, fish can increase the utilization of fish ponds, reduce the rent per unit of fish, and increase the economic benefits of fishery. The main points of its management techniques are as follows: 1. Conditions of the fish ponds (1) The area is suitable, and the depth is moderate. Considering the operability of the net fishing and dry pond fishing, the general selection area is 3 to 15 mu and the water depth is 1.5 to 3 meters. Fish ponds. (2) Adequate water sources, convenient drainage and irrigation facilities, and convenient transportation Because the labor intensity of fish and fish species, fertilizers, feed, and adult fishes in fish ponds in one and two seasons is relatively large, the transportation facilities are more emphasized. Second, accurately grasp the production process to accurately grasp the production process is an important guarantee for the two seasons of fish. According to the climatic conditions of Yongzhou City, Hunan Province, the experience of the past years is as follows: Feeding of fingerlings from January to February is enhanced from March to June. Feeding is started in June and fish are sold. July to July. Strengthen bred 11-December months to save the fish at the end of the year. Third, the adult fish management technology points (a) fish stocking time should be as early as possible, not later than February. Early stocking can allow fish species to adapt early and feed early. 15 days before stocking, fish ponds must be completely cleared in clear ponds, and basal fertilisers should be applied after clear ponds for 3 days. Fish species require the same specifications, strong physique, no disease or injury, and they must be immunized or sterilized when they are released. The fish stocking is mainly based on large-size edible fish, and the stocking density can be referred to as follows (tail/mu): 0.2-0.5 kg grass carp 250, 0.2-0.5 kg grasshopper 100 tail, 0.05 One hundred kilograms of good breed 鲫 100 tails. (B) to strengthen the breeding one is to promote early eating, feeding after the release of high-quality pellet feed tame food, to the normal food intake in early March; second is 4 to 6 months to strengthen feeding, divided into 2 times a day to fish weight 3% ~ 5% feeding, and with a suitable amount of tender grass, lettuce leaves and other green feed. (3) Water quality regulation As the feed is fed every day, the water quality is liable to deteriorate. New water should be added in time to adjust the water quality, increase the dissolved oxygen in the water, and make the water transparency about 25 centimeters so that the grass carp does not float. If necessary, an aerator should be provided. It should be turned on for 1 to 2 hours at noon on sunny days. (D) Strengthen the prevention and treatment of fish diseases Mainly prevent and treat diseases such as red skin, gills, enteritis and surface parasitic diseases, adhere to prevention, conduct water disinfection once a month, and perform bait feeding every 15 days. Fourth, fish species management technology points (a) fish species should pay attention to when the issue is one clear pond disinfection should be thorough, kill wild fish; second is to apply base fertilizer; third is fish fingerlings, immersion disinfection operation carefully To prevent injury to fish. (2) The stocking densities can be referenced as follows: About 7 centimeters per acre are reared with about 3000 grass carp species, about 5 cm per carp species are about 500 species, and about 3 cm are about 100 species of good species carp species (which can be cultivated in that year). (3) Feeding and feeding Fertilizing and feeding is mainly based on pellet feed. From July to October, 8% to 10% of the fish's weight should be thrown during intensive cultivation, and they should be fed 3 times a day. Fertilization should be based on water color, mainly organic fertilizer, to maintain water quality "fertile, live, tender and cool." If water quality is found to be worse, change the water promptly. (d) fish diseases prevention and treatment of grass carp common diseases are bleeding and surface parasitic diseases, available bleeding, rare earth fish mixed feed to prevent bleeding.
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