From the winter solstice to the beginning of spring, it is the golden season for freshwater fish stocking. Because of the low temperature during this time, the water quality is relatively stable, and the fish body is of good constitution and tight scales. It is not easy to pull the net, transport, and release, and can quickly adapt to the surrounding new environmental conditions, which is conducive to rapid growth after the spring. In winter, when stocking fingerlings, you must pay attention to the following three points.
The fish ponds will be transformed into small ponds, shallow streams, dead water ponds and leaky water ponds during the winter season. The fish ponds with better conditions will also need to be trimmed and put into dry pond water. After the sun has been exposed or frozen, heavy mud will be excavated. Eradicate weeds, heighten and reinforce ponds, and disinfect with lime clear ponds.
The fish species selected for the winter season should be selected as the normal shape, strong physique, rich back muscles, short tail shank, complete scales, smooth body surface, mucus, bright eyes, lively beating, slightly larger size of green and grass. , squid is about 12 centimeters, squid is about 10 centimeters, squid 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. 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.
Prevention of disease in winter fry, special attention should be paid to the prevention and treatment of 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 2.5 grams per day is used. The medicine is mixed with rice bran, wheat bran, flour, etc. and then fed once a day until the elimination of 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. Saprolegnia: initially found in hydromycosis, with Chinese gall curd juice, even the juice spilled Quanchiposa. If the condition is serious, you can increase the gall nutrient concentration, splash twice a day, sooner or later, make the pool of liquid medicine The concentration 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, and twice a day in severe condition.
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