Koi originated from Chinese carp and is a Japanese fish. It has been cultivated for 200 years and can be divided into 13 major strains, with about 100 varieties. Koi has elegant posture, beautiful body shape, bright colors and brilliant markings. It is called “live gems in the water†and is a larger fish with high ornamental value. The outline of Koi breeding techniques is as follows. First, the environment requirements Koi and goldfish like water temperature, water quality requirements lax, appropriate temperature range of 2 °C ~ 30 °C, but can not resist the sudden changes in water temperature, temperature suddenly exceeds 2 °C ~ 3 °C Koi will appear discomfort, the most Appropriate water temperature is 20°C～25°C; sufficient oxygen is required to live in a slightly alkaline, low-hardness water environment. Second, the food requirements Koi carp is omnivorous fish, general mollusks, higher aquatic plant debris, benthic animals and even small algae or artificial grain feed can eat it. Third, the choice of fish species should be selected fish health, no injury, no scale and other diseases, fish, bright colors, diverse, well-defined fish species. Fourth, stocking density Fish pond density general stocking can refer to the density of fish ponds Koi density table; water cluster box density is generally 60 cubic centimeters, 30 cubic centimeters, 15 cubic centimeters can be stocked up to 15 centimeters to 20 centimeters of Koi 6; 90 cubic meters Centimeter 30 cm3 50 cm3 can be stocked 8; 110 cubic centimeters 30 cm3 50 cm3 can be stocked 10, Fishpond stocking Koi density table 5, bait feed Koi is omnivorous fish, it is best to feed Synthetic granules, baits, bean cakes, cakes, bread crumbs, fish worms, clams, crab meat, clams, duckweed, etc. Sixth, the four seasons management Koi with the seasonal temperature changes, its management methods are also different. In spring, when the weather is warm and cold, Koi begins to recover from hibernation, and the rearing from the indoor to the outdoor, but pay special attention to sudden cooling, to timely cover the film to keep the water temperature stable; feeding mainly plant food, the amount of investment by Less gradually increased to facilitate digestion and absorption of Koi. In summer, when the weather is hot and hot, plastic shading nets must be used to prevent direct sunlight, and the sun's illuminance should be reduced from 8000 to 12,000 lux to 550 to 5,800 lux. In autumn, the weather is less clear and rainy, the water temperature is obviously decreased, and the most suitable koi grows, which can increase the proportion of animal (protein), such as silkworm cocoons. Increase the amount of investment to promote long. In winter, the weather is relatively cold. When the temperature drops to 0°C, it is necessary to transfer the koi in time to the indoor fish pond for winter. The indoor water temperature should be kept at 2°C～10°C. The focus is on insulation, proper feeding, and protection against disease. From November to March of the following year, it is the wintering period of Koi. Seven, fish disease prevention Koi common fish disease mainly watery mildew, gill disease, enteritis disease, vertical scale disease and several other. 1. Saprolegniasis (bacterium mildew, whitish disease) Symptoms of disease fish have gray-white cotton wool without hairy hyphae. Control methods 1 malachite green 0.2ppm ~ 0.4ppm soak; 2 formalin 0.5ppm soak; 3 salt 400ppm ~ 500ppm and sodium bicarbonate 400ppm ~ 500ppm dubbed mixture, the diseased fish concentrated application of the pool. 2. The symptoms of gill rot disease fish are sluggish, body color and black head, severe silk decay, covered with a small transparent window. Control methods 1 Bleach 1ppm soaking; 2 Furacillin soaking 1.5ppm ~ 2ppm; 3 erythromycin 0.3ppm soak; 4 Copper sulfate 0.5ppm ~ 0.7ppm spill. 3. The symptoms of enteritis were dark-colored, anal swelling, abdominal enlargement, and yellow mucus spillage in the abdominal cavity. Control methods 1 furazolidone soaked 0.1ppm ~ 0.7ppm, with oxytetracycline mixed bait; 2 Furazolidone 1g ~ 2g/100kg, oral administration for 3 days; 3 a small amount of garlic mixed bait feeding, continuous feeding 3 days. 4. Vertical scale disease (squamous disease, pine scales) Symptoms Fish surface roughness, systemic scales erect as a loose ball, scales at the base of edema, there is exudate. Control methods 1 furacillin 1ppm treatment. 2 Salt was fed in 0.5% water, stopped for 2 days, and fed with sulfadiazine 0.6 g bait each day. 3 Dip 2% aqueous solution for 10 minutes. 4 Erythromycin 2.0 ppm to 2.5 ppm for 30 minutes to 50 minutes.
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