Several Problems in Freshwater Breeding
First, on the salmon farming 1, how to prevent salmon hemorrhagic disease? The disease is a bacterial disease. The body surface, oral cavity, and intestinal tract of the disease are bleeding. The mortality rate is high, and it is generally popular from May to September. There are three ways to prevent it. First, clear the pond thoroughly with quick lime, wash the pond frequently, replace the pool water, and maintain good water quality. Second, use 0.3 mg/L of strong chlorine or fish disinfectant Quanchiposa. Every 10 days to 15 days, the two can be used interchangeably. Third, the stocking of the seedlings in the pool, at the same time stocking part of the meal, can also prevent the disease. Treatment: (1) Quanchiposa. One gram of erythromycin (250,000 units per gram) is used per cubic meter of water. (2) Oral administration: Mix 1 g to 2 g of high-efficiency fertilized fungus per catty of feed and feed it for 5 days to 7 days. 2, on the problem of yellow seedlings. At present, the seedlings for the cultivation of Astragalus membranaceus in our province are still based on the acquisition of natural, natural seedlings. Before putting it into Dianchi, soak the seedlings with 5% salt water for 8 minutes. All those who are tumbled in salt water and have severe fleas should be singled out. These are all traumatic and should be eliminated. Some tabloids reported that in the south, there are extra-large yellow lice that have been imported from Thailand. If you want to espouse, you should seldom introduce cultivating them. You must not introduce them in large numbers to avoid the large number of deaths caused by alien seedlings that are not suitable for the environment of our province. Second, on the trout aquaculture 1, the current status of salmon trout pond farming in our province? A: The supply already exceeds demand. The price of squid has been decreasing year after year. The cost of raising a kilogram of carp in recent years is about 5 yuan. Approximately two-thirds of the fish farmers can still make money, one-third of white money does not make money, and individual losses have already occurred. The ponds that raise squid can be summarized as three breeding modes. The first is to cultivate for two years, that is, to develop the fish seedlings in the first year from 100g to 250g fish species, and then from the fish species to develop commercial salmon. The yield per mu is about 1,000 kg. Second, for the annual development, from June to December of last year, the eel fry were raised to 400-500 g and then wintered, and by the second year of June, the commercial eel was sold. The first anniversary of the time from fry to cultivation is mostly adopted in suburban areas with high production levels. Third, for the year to develop, that is, in June stocking carp eggs or inch pieces, to the November of that year can develop commercial carp. This method has a relatively high technical content and it is necessary to carry out intensive rearing of squid with fewer users. Third, on the introduction of new varieties of the current several breeds have a good development prospects? Answer: (1) Penaeus vannamei. This shrimp can be diluted in freshwater ponds. It has a short cycle, less disease, and a higher selling price. It has been tried and raised last year, and the test raisers have achieved better results. This year it has been expanded. (2) Green shrimp. Recently, the price of fresh shrimp has skyrocketed. This is due to the fact that natural waters are often polluted, and the resources of the shrimp are declining and the number of farmers is very low. There is less investment in the cultivation of shrimp, and effective in the same year, it requires less human feed than fish, but the benefits are higher. Can develop aquaculture in the near future. (3) Wuchang fish. This fish is famous for Chairman Mao who "had only drinking Changshan water and eaten Wuchang fish." The meat is fresh and its flavor is unique. In recent years, anglers have become more popular. They sell for more than twice the price of carp. Supply is now in short supply. This fish farming technology has mature technologies available. Can develop culture. (4) Chinese sturgeon. Although the current price is the lowest in history, it is still more profitable than fish farming. At present, it is necessary to develop the breeding mode of self-cultivation and pro-breeding, self-built wintering in greenhouses, and self-construction and cultivation of outdoor earthen ponds. This model has low cost and high efficiency. For farmers with strong financial power, they can choose this breeding project.