Industrialization of pollution-free breeding Ma Su salmon technology
First, the site selection: fish pond length and height specifications are 10m, 6m and 1.5m, north-south direction. The pH of the pool water is controlled at 7.6 to 8.5, the salinity range is 20 to 25, the dissolved oxygen is greater than 5 mg/L, and the ammonia nitrogen content is less than 0.1 mg/L. The water temperature is 17-22°C.
Second, seed stocking: 1 fish species selection size is greater than 4, complete body, no disability, no deformity, healthy and lively, uniform size, body color is normal bright color. 2 Seed transport: Before transport, stop the food and cool it. Use plastic bags to seal the package and transport it. The water temperature should be 8~10°C. Each plastic bag can usually hold up to 150 seedlings with a body length of 5 or so. When the bags are taken into the pool, the temperature difference between the temperature in the bag and the water in the pool does not exceed 2°C. 3 Disease prevention: Povidone iodine 0.3ppm can be used for 3 days continuously. Fish fry stocking should first be put into holding ponds for salinization treatment, increase the salinity by 1‰ to 2‰ per day, and adjust the salinity to about 20‰ in about 10 days to 15 days.
Third, feeding: body length is usually fed fresh Artemia bait, put the bait 4 to 6 times a day, body length is greater than 10, began to feed homemade wet pellet bait. When the weight of the fish is less than 250 g, the main particles are wet particles, which are fed three times a day, and the daily feeding amount is generally 4 to 5 of the fish's body weight. When the fish weighs more than 250g, it can be fed with artificial diet.
Fourth, the development and survival rate: 1 Growth: Masu salmon seed weight less than 250g, the slower growth. After raising for 200 days, the average body weight can reach about 350g; after 400 days of feeding, the body weight can reach about 1000g, and the maximum body weight can reach about 1500g. 2 Survival Rate: The peak of the death of Masu salmon occurred in the first 4 months of growing. When the weight exceeds 200g, the mortality rate will be greatly reduced.
V. Daily management: 1 Each cultivation pond is equipped with special tools, which must be strictly disinfected before use. 2 Workers should disinfect the tools and water boots used before entering or entering the workshop. 3 Inspect the workshop frequently to check whether the gas, water temperature and fish species are abnormal. 4 In time remove the sick fish with dark body color and abnormal activity. Put the diseased fish into a small pool for observation and application. Wait until he recovers and put it back into the big pool. 5 Early application of pesticides. In the early stage, three yellow powders, multivitamins, and immunopolysaccharides should be added to the compound feed. 6 The growth of Masu salmon was measured once a month, and the feeding amount and survival rate were counted, and the results of comprehensive development were analyzed.
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