The key technology of American bigmouth fish breeding

The key technology of American bigmouth fish breeding

The American bigmouth bass is also known as giantmouth bass and calf. The Mississippi River basin, which originates in North America, is a large-scale economic fish that has the characteristics of delicious meat, large individuals, fast growth, and strong fertility. Our country was introduced from the United States in 1993. After several years of trials and tests in the region, it shows that the fish is fast growing, easy to raise, easy to catch, and resistant to disease. It can produce about 500 kilograms per mu and the largest individual seedling can reach 500 grams. The above, the second year up to 700 grams to 1500 grams, is a good new breed of freshwater, is a reliable way for farmers to increase production and income.
Breeding American roach fish should pay attention to the following techniques:
First, living habits.
The fish is generally active in the lower layers of the body of the water and swims to the surface of the water or upper waters only when it is ingested. The temperature of living water is 0°C to 40°C, and the suitable water temperature for growth is 18°C ​​to 32°C. Normally, food intake is not more than 15°C, and food consumption is less or less than 15°C. Under natural conditions, the fish mainly feed on zooplankton and zooplankton. Under artificial conditions, in addition to ingesting zooplankton, it is also possible to ingest pelleted feeds with a low feed coefficient. In the middle and lower reaches of the Yangtze River in China, the average weight of the year is about 200 grams, the largest is 500 grams or more, the second year is 700 grams to 1500 grams, and the third year is 1500 grams to 2500 grams.
Second, artificial breeding.
The sexual maturity of the fish is between 2 and 3 years of age. The mature individual has a body weight of more than 1 kg. The maturation color of the sexually mature individuals is more pronounced. The reproductive water temperature is 18°C ​​to 32°C. Breeding habits are similar to those of carp. Although the largemouth bream can be sexually mature at 2 years of age, the broodstock used for reproduction should be above 3rd instar in order to ensure the superiority of the offspring and the higher oviposition. Therefore, the selected broodstock must be physically strong, disease-free, and invigorating. The conditions for the cultivation of the pond are the same as those of the four-mackerel broodstock breeding pond. Broodstock stocking densities: The main pond is stocked with large sized mutton fish from 300 kg to 350 kg per acre, and can be accompanied by a small amount of grass carp or squid. In order to promote the maturation of the gonads and obtain an excellent egg, it is necessary to intensify cultivation of the broodstock one month before the breeding season. During the period of intensive cultivation, quality feed should be fed twice a day. The protein content in the feed is required to be about 32% to 35%, and the feed is sufficient and nutrition is ensured. The daily feeding amount is generally 5% of the fish's body weight, depending on the changes in water temperature and temperature. At the same time, it is necessary to supplement fertilization, promote the reproduction of planktonic operations, and pay attention to regulating water quality and preventing diseases. In addition, in order to prevent the broodstock abortion or self-production in the pool, when the water temperature rises after the spring, the male and female largemouth bass should be kept in a separate pond.
Third, seed cultivation.
The cultivation pond area is between 2 mu and 3 mu, and the water depth is between 0.8 and 1 m. It is suitable to be disinfected at 7 days to 10 days before the fry in the pond. When the efficacy disappears, the water is drained for about 30 cm. The zooplankton is fertilized and cultivated for zooplankton. At the peak of growth, fry can be released. Stocking density is about 150,000 per acre. After the fry falls, milk is fed twice a day and the water level is increased by 5 cm to 10 cm every week. After 24 days to 30 days of cultivation, the body length of the fish reaches 2.5 cm to 3 cm. The cultivation method is similar to the cultivation method of carp species.
Fourth, adult fish farming.
Suitable for breeding or polyculture in ponds. The main pond is raised, with 25 to 30 grams of 25 pieces of winter fish per acre, 600 to 800 tails, 25 to 30 tails of whitefish, 30 to 40 grass carp, and a small amount of carp. Under good conditions, at the end of the year. Individuals generally reach 0.6 kg to 1.2 kg, 400 kg to 500 kg per mu. Feeding methods: either feeding the main feeding or fertilizing the main breeding, but the main use of fertilizers, feed supplements as a supplement effect is better, the manure of livestock and manure, manure and other organic fertilizer, the appropriate application of nitrogen, phosphorus and other fertilizers . Pool water transparency is controlled at about 25 cm to 30 cm. Daily management is mainly the timely addition of new water, to maintain water quality "fat, live, cool." During the high temperature and fish disease epidemic season, 20 kg of lime are poured every half a mu for disease prevention, water quality regulation and disease reduction. The polyculture of ponds can put 20 to 30 grams of winter fish from 50 to 100 tails. If there is no increase in feeding and reduction in the amount of other fish, 50 to 80 kg of fish can be produced per acre. .

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