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How to increase the survival rate of first-year grasses
In recent years, the survival rate of first-age grass carp species is generally low, generally only 40% to 60%, and the specifications are also small, mostly 10-13 cm, which affects the economic benefits of breeding. So, how to improve the survival rate of first-year grass fingerlings? Based on the production practices of the past few years, the author briefly describes the main measures that should be taken to cultivate first-year grass fingerlings for reference. First, the pond completely disinfected grass fish 25-30 days before the pond under the summer flower pond should be drained, digging too much silt, remove the pond bottom and surrounding weeds, foreign bodies, leveling the bottom of the pond, repair and reinforcement of the pond base, Dredging drainage channels, then use 100-150 kg of quick lime per acre, or 10-15 kg of bleached powdered water to disinfect the whole pool to thoroughly kill wild fish, pathogenic bacteria, parasites and other harmful organisms. Second, the cultivation of palatable natural bait fish pond clear pond disinfection, in the grass carp summer flower pond before 20 days can be injected into the pond, water injection depth of 0.8-1 m is appropriate, applied organic fertilizer 300-400 kg / acre. In the 7-10 days before Xiatang, 150-200 kg/mu of organic fertilizer is applied. After 3-5 days, 30-50 kg of organic fertilizer is applied per mu to accelerate the reproduction of E. cylindrica, duckweed and Cladocera. , so that grass carp can be eaten when the pond is rich in natural food. Third, the main fish rearing, with fish in the late pond in order to ease the grass carp between the summer and the allocation of fish in the bait, water quality and space conflicts, should be early stocking grass carp summer flowers, generally from the end of May to early June Stocking, stocking density 5000-6000 tail / acre is appropriate. The time for fish rearing ponds should be postponed as much as possible, generally 30-40 days later than grass carp, that is, grass carp has grown to more than 10 cm, and competition for food is strong before it can be used for fish rearing. Fourth, reasonable feeding, ensure that fish eat well, eat enough, eat grass carp summer pond, the water temperature is suitable, fresh water, food rich palatability, breeding density is relatively thin, fish disease season has not arrived, should try to feed enough, Promote fish growth. On the basis of cultivating natural food, concentrate feed should also be fed properly. During August-September, the water temperature is high and it is necessary to properly control the food intake and not feed at night. Since late October, the water temperature has dropped and the fish disease season has passed. You can invest in enough food to allow the fish to eat day and night. 5. Fresh water is often added to keep the fresh water grass fresh and clean. However, grass carps eat natural foods, have more feces and are easily fed with fresh water. They should always fill new water. Normally, watering should be performed 7-10 days in the early and late stages of feeding and once every 3-5 days in August-September. It is advisable to fill 5-10 cm of water each time. Sixth, to strengthen fish disease prevention Grass carp before the summer flower pond, first with 2% -3% saline or 20 mg / potassium manganate solution dipping 15-20 minutes, to kill the fish body surface, the orbital pathogens, July-September fish disease epidemic season, every 15-20 days with 30 grams / cubic meter of lime or 1 g / cubic meter bleach Quanchiposa, control of grass carp gill disease, and use drugs bait for 3 days to prevent intestinal inflammation. (Fujian Shaxian Aquatic Technology Promotion Station Huang Bangxing)