Some people think that winter fish ponds have low water temperatures, low fish activity, slow metabolism, low food intake, and low water quality requirements. Fish ponds do not require calcium and phosphorus, thus neglecting winter fish farming for calcium and phosphorus. The application. In fact, this is a misunderstanding. Under low temperature conditions in winter, increasing the content of calcium and phosphorus in water is more conducive to improving water quality conditions and physiological metabolism of fish. It can not only enhance the cold-resistance ability of fish, increase the survival rate of overwintering, but also maintain the normal physiological indicators before overwintering, give full play to the growth potential after the spring, and increase the aquaculture production and economic benefits.
1. Selection and proper application of lime The production of lime is used to supplement calcium in the aquatic production. This method is not only labor-intensive but also difficult to handle, and particularly poor in safety. After years of exploration, we believe that a more feasible method is to dig a pit near the pond. The size of the pit depends on the area of ​​the fish pond, generally 5 to 10 为. It is advisable to use bricks to protect the bottom and the surrounding area. After being filled with water, the quicklime is put into the pit first, and the bath bubble 3~5 angels become mature lime, which is then diluted with water and mixed into a low viscosity emulsion shower. Usually 15 to 20 days spilled once, the dosage is 30 to 50 grams of cooked lime slurry per cubic meter of water. This method can also be used to disinfect clear ponds and its effect is better than using quicklime.
2. The selection and correct application of phosphate fertilizer There are many types of phosphate fertilizer used in fishery production in China. From the perspective of a comprehensive analysis of the price of effective nutrient components and technical feasibility, a primary superphosphate containing 18% of available phosphorus is selected. Or with 16% of available phosphorus secondary calcium superphosphate is better; where the culture water surface is large and the economic strength is strong, heavy superphosphate or monoammonium phosphate can also be used. Their common feature is that the aqueous solution is weakly acidic and cannot be applied at the same time as lime. It is usually applied for 4 to 6 days before applying phosphate fertilizer. From the experimental situation, the application amount of phosphate fertilizer was calculated to be 0.3% of available phosphorus per cubic meter of water. The interval between application of phosphate fertilizer and lime application time is consistent. No matter which type of phosphate fertilizer is used, the water must be sprayed evenly to increase the utilization rate. Don't waste time by trying to save the phosphate fertilizer and sinking into the pool bottom.
1. Selection and proper application of lime The production of lime is used to supplement calcium in the aquatic production. This method is not only labor-intensive but also difficult to handle, and particularly poor in safety. After years of exploration, we believe that a more feasible method is to dig a pit near the pond. The size of the pit depends on the area of ​​the fish pond, generally 5 to 10 为. It is advisable to use bricks to protect the bottom and the surrounding area. After being filled with water, the quicklime is put into the pit first, and the bath bubble 3~5 angels become mature lime, which is then diluted with water and mixed into a low viscosity emulsion shower. Usually 15 to 20 days spilled once, the dosage is 30 to 50 grams of cooked lime slurry per cubic meter of water. This method can also be used to disinfect clear ponds and its effect is better than using quicklime.
2. The selection and correct application of phosphate fertilizer There are many types of phosphate fertilizer used in fishery production in China. From the perspective of a comprehensive analysis of the price of effective nutrient components and technical feasibility, a primary superphosphate containing 18% of available phosphorus is selected. Or with 16% of available phosphorus secondary calcium superphosphate is better; where the culture water surface is large and the economic strength is strong, heavy superphosphate or monoammonium phosphate can also be used. Their common feature is that the aqueous solution is weakly acidic and cannot be applied at the same time as lime. It is usually applied for 4 to 6 days before applying phosphate fertilizer. From the experimental situation, the application amount of phosphate fertilizer was calculated to be 0.3% of available phosphorus per cubic meter of water. The interval between application of phosphate fertilizer and lime application time is consistent. No matter which type of phosphate fertilizer is used, the water must be sprayed evenly to increase the utilization rate. Don't waste time by trying to save the phosphate fertilizer and sinking into the pool bottom.
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