Rainbow trout, also known as waterfall fish, seven-color fish. Originating from the United States, in 1959, we moved from North Korea to settle in China. Rainbow trout is one of the world's most important farmed fishes, and it is also a precious cold-water fish. It is undoubtedly one of the famous new fish species in China. Its meat is delicious, it has less fleshy meat, rich nutrition, fast growth, easy fishing, high utilization rate of feed, and it is listed as high-grade commercial fish in domestic and foreign markets. More characteristic is suitable for high density, intensive farming, its high yield per unit area, Japan's highest 1 year 666 square meters up to about 10 million kilograms, the Israeli acres yield as much as 125,000 kilograms. It can be seen that rainbow trout is a high-yield, high-efficiency and high-quality breeding species with broad development prospects. Should strongly promote the development and promotion of farming.
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1. Fishpond conditions Adult fish breeding ponds can use various shapes, sediments and structures, as long as the water flow is unimpeded to ensure the exchange of water bodies. The concrete pool is 50 square meters and the depth is 1 meter. The earthen pond is bigger and deeper. ? Equipped with sewage and oxygen aeration facilities, apply lime prior to seedling disinfection, and release the fish after the efficacy disappears.
2. The size and size of the fish stocking species should be neat, and the tail weight should be about 50 grams. Stocking densities are: at a water temperature of 15°C, 1-1.5 kg of fish can be raised per liter of water per minute or calculated as the metabolic oxygen demand of rainbow trout at 300 mg per kg of body weight per hour.
3. Feeding and management of adult fish The main artificial synthetic full-price pellets. Among them, animal feeds account for 30 to 40%, and plant feeds account for 70% to 60%. Protein content should be 40% -2% is appropriate, fat content should account for 7% -9%, digestible carbohydrates accounted for 9% -12%, but also contains a certain amount of vitamins and minerals. The diameter of the pellets is preferably 4-8 mm. Feeding 3-4 times a day, adhere to less feeding method. When the water temperature is 8°C, the dosage is 0.7%-1%, when the water temperature is 12°C, the weight can be 1%-1.4%; when the water temperature is 16°C, the feed can be fed according to 1.3%-1.8% of the body weight. The general principle of feeding on demand, no more, a lot, eat well, depending on the fish, water flexibility. When the fish weighs more than 100 grams, it is ready to eat. In addition, the rainbow trout can weigh up to 400-1000 grams at the age of 2 and can reach 1000-2000 g at the third age. Its life span is generally 10 years, and the maximum weight is up to 10 kg. The 3rd age is mature. Feeding water temperature 2.3 °C -25.6 °C, less than 2.3 °C then stop eating. The suitable temperature for the fish species to adult stage is 7-20°C, and the optimum water temperature for juvenile fish is 12-13°C. When the water temperature is below 0°C, it enters hibernation, but the water stocking does not hibernate. High water temperature of 25°C can be tolerated under conditions of high water and high dissolved oxygen. The PH value is required to be 4.6-9.2. The turbidity of the pool water should be less than 10 μl/L. When the rainwater falls into the pond, the rainbow trout will die. . We must take prevention as the main principle, and emphasize the principle of prevention and treatment. We must prevent and treat fish diseases and clean up our enemies.
