Transform fish ponds. In the winter season, the small ponds, shallow streams, dead pools and leaky water ponds are rebuilt. The fish ponds with better conditions are also required to be trimmed, put dried pond water, and after the sun has been exposed or frozen, the thick silt will be excavated to eradicate the weeds. , heighten and reinforce the pond and disinfect it with lime pond.
Select fish species. The fish species to be put in winter should be selected as green, grass and squid with normal appearance, robust physique, abundant back muscles, short tail shank, complete scales, smooth body surface, mucus, bright eyes, lively beating, and slightly larger specifications. About 12 centimeters, salmon is about 10 centimeters, and salmon is about 6 centimeters. Fish species are generally selected between water temperatures of 6°C to 10°C, sunny weather in the middle and afternoon, and rainy or foggy days should not be used. Generally, it is appropriate to put 200 to 250 fry per acre pond, and fish ponds should often be patrolled after they are put. Once the weather turns cold, deepen the water level in time to avoid a sharp drop in water temperature. As the water temperature increases in sunny days, some concentrated feeds can be put in order to promote rapid growth of fish species.
Prevent disease. In winter, fish seedlings should be given special attention to prevent and control the following diseases. 1. Red skin disease: found that the disease of fish fry, to sprinkle bleaching powder in the pond, so that the pool water concentration of 1ppm, while feeding sulfathiazole baits, the first day of 50 grams of fish per acre medication 5 grams, within a week Use 2.5 grams daily. The medicine was mixed with rice bran, wheat bran, flour, etc. and fed once a day until the elimination of the red skin disease. 2. Trichodinosis: The early discovery of trichodiasis can be done by using cloth bagged copper sulphate and ferrous sulphate on the edge of the pool. If the trichodiasis is more serious, the copper sulfate and ferrous sulphate can be used to sputter the 5:2 Quanchipi. The drug concentration reached 0.7ppm. 3. Saprolegniasis: Soriomycetes were found in the early stages. The gall oil was used as a liquid and even the juice was splashed with the residue. If the condition is serious, you can increase the gallnut concentration, splash twice a day, sooner or later, so that the concentration of pool water solution is 4ppm. 4. Scyllar echinococcosis: The diseased fish has small white spots of varying sizes on the body surface or the sacral area and the fins. Mercurous nitrate can be used to treat the diseased fish. The liquid is added and 0.1 g of mercuric nitrate is added per cubic meter of water. ~ 0.2g, Quanchiposa, once in the early days, two times a day in severe condition.
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