I. Selection of farms The water temperature of aquaculture ponds requires that the temperature be above 4°C in winter and not more than 20°C in summer. The annual growth of rainbow trout can be observed. Pool ponds should be flow basins, with fresh water, high transparency, and sufficient oxygen content. The water does not contain any toxic or harmful substances. Second, the construction of farms Mountain streams, springs, groundwater, deep water reservoir bottom drainage or water temperature is low, transparent river water, etc., can be used as a water supply for rainbow trout farms. Build dams at the top of the water source to raise the water level and create a drop in the water flow to keep the pond water supply at a sufficient flow rate. Water injection in ponds, especially in intensive farms, should be independent. Pond round, oval, rectangular, gutter-shaped can be, but to extend the rectangle as a good, wide and long ratio of 1: 4 to 1: 5, to prevent the flow of water in the pool stagnation of the dead. The width of the pool should not be too large. The juvenile pool is more than 1.5 meters to 2 meters wide, and the width of the fish pond is usually 4 meters to 5 meters. The bottom of the pool requires certain slopes and slopes. Juvenile fish ponds are suitable for 0.2% and adult fish ponds are suitable for 0.8%, which is convenient for drainage, drainage and fishing. Ponds may be earthen or cement pools, and the shore of the pool is 20 cm to 30 cm above the water surface. Juvenile ponds generally range from 30 square meters to 90 square meters, and adult fish ponds range from 100 square meters to 200 square meters. Third, juvenile fish and fish rearing The newly emerged juveniles have poor feeding ability and are not clustered. When starting feeding, care should be taken to spread the feed over the surface of the water. After feeding for two weeks, the feed can be sprinkled into the fish. The more commonly used juvenile opening baits are egg yolk, liver of livestock, fresh fish, dried leeches or brewer's yeast, etc. Currently, artificial feeds are mostly used. Feeding animal feeds must be meticulously or mash into the paste on the water surface of the pool to allow the fish to ingest. The paste made of the feed can also be put on thin wire mesh and placed in a hanging pool for fish to feed. After the late juveniles get larger, when they are fed, they can mix and mix several types of feed and cook them into small granules and sprinkle them into the water. Feeding compound feed, the early particle size is 0.3 mm to 0.5 mm, and the later particle size is 1 mm or more. The amount of animal protein in feed is higher than that of vegetable protein. With the growth of juveniles, the content of plant protein can be appropriately increased, and the number of feedings per day should be more, and it is advisable to use 6 to 8 shots per day, and 2 to 4 shots per day in the later period. When the general water temperature is 10°C or more and the length of the juveniles is 13 cm or less, the dry feed is fed at 2% to 7% of the fish's body weight, and the fresh feed is fed at 2.5% to 13%. When the body length is 14 cm or more, the dry feed is fed at 0.5% to 2.4% of the fish's body weight, and the fresh feed is fed at 1.0% to 4.9%. The stocking density of early juveniles ranges from 5000/m2 to 10,000/m2. When juveniles weigh about 1 gram (4 centimeters to 5 centimeters in length), they need to be kept in separate ponds depending on the size of the individual. About 2 grams of fish (5.5 cm in length) are stocked at a density of 1200/m2 to 1,500/m2. After 5 months, individuals weighing 20 to 30 grams of fish have a stocking density of 500/m2 to 100/m2. Fourth, adult fish rearing International rainbow trout generally weighs 150 grams to 300 grams for the listed specifications. The fishtail weighs 60g to 70g, stocking density is 230/m2 to 250/m2, fish tail weighs 100g to 150g, and stocking density is 100/m2 to 150/m2. At the same time, increase the flow of water as the water temperature increases. Adult fish rearing ponds are mostly rectangular, with a length-to-width ratio of 10:1 being appropriate, an area of ​​100 to 200 square meters being the best, and a bottom slope of 0.8%. The average flow rate of pool water should be greater than 2 cm/s, generally 3 cm/s to 5 cm/s, dissolved oxygen should not be less than 5 mg/l, and ammonia nitrogen should not exceed 1 mg/l. Periodically remove sediment from the bottom of the pool, drain pool water, and wash the pool. For high-density farming, artificial oxygenation is required to feed high-quality nutritious food.
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