Ten measures for disease prevention of four major domestic fish

First, one of the main purposes of the dry pond at the bottom of the pond is to oxidize the organic matter at the bottom of the pond after being exposed to the sun for a period of time.

Second, thoroughly choose massive calcium oxide without water absorption and weathering in the poison pond. Before use, it can be hydrated and turned into strongly alkaline lime powder or slurry lime water, which can kill all kinds of pathogenic bacteria and parasites, and can promote the calcification of silt and prevent the reproduction of bacteria.

Third, reasonable density means to produce as much as possible according to one's own culture environment and technical conditions, not to pursue high yield unrealistically, and to breed appropriate density under the condition of fish loading allowed by the water body.

Fourth, a reasonable collocation of the four major fish ponds, which generally refers to the ponds dominated by grass carp, mixed culture of big head (bighead carp), carp (silver carp), crucian carp, mud carp and so on. The purpose of reasonable collocation is not only from the output value of all kinds of fish, but also from the reuse of feed, in order to reduce feed waste and water pollution. Reasonable collocation, feed pellet feed debris, carp eat the rest and its feces to crucian carp, mud carp, carp and other omnivorous fish, re-use, greatly improve the feed utilization rate. The manure of all kinds of fish is beneficial to the growth of phytoplankton and zooplankton, which can be used by bighead carp and silver carp again. In this way, the overall production cost of fish is reduced, and the effect of feed residue on water quality is reduced. At the end of the day? BR >

5. The main purpose of vaccination is to prevent the "rotten gills, enteritis and bleeding" of grass carp. Grass carp are more prone to three diseases before 2 jin of body weight, so all grass carps before 2 jin should be vaccinated 2-3 times. Now in the Pearl River Delta region, grass carp species are basically given "injections", but most of the vaccines are prepared by local personnel themselves. The effect of these vaccines is not easy to guarantee, and the negative impact is obvious. It is recommended that staff engaged in injection should be able to choose some formal production vaccines with better titers produced by scientific methods.

Sixth, fish species disinfection, whether it is a few centimeters of body length, or 2-3 jin of fish, before putting into the pond culture, must be treated with medicine bath. Fish species bought from other people are likely to carry pathogenic bacteria or parasites. Centralized treatment of fish species is not only low cost, but also good effect and convenient treatment. Their own fish species through the pond, after medicine bath treatment, is also an effective prevention and control measure.

Regular disinfection, regular disinfection and use of bait feed, the dosage is small, the cost is low, and the growth of fish will not be affected. When the fish really get sick, because the medication is difficult to operate, it is impossible for each fish to be treated, it can only play a controlling role, and it is a temporary cure rather than a permanent cure. Most farmers have deep experience that when the disease is treated in fish ponds, it is effective in the short term, but it still occurs again and again after a period of time. From March to November, the pond water body was disinfected and the pond bottom was treated once a month, and the special bait was fed for 3-4 days a month, which could achieve effective disease prevention effect.

Eighth, photosynthetic bacteria for biological water transfer are beneficial bacteria selected by scientific methods. After the beneficial photosynthetic bacteria are artificially introduced and allowed to multiply in large numbers in the pond, the reproduction of other harmful bacteria will be restricted, and the photosynthetic bacteria mainly use their own biological functions to purify and treat the organic matter in the bottom of the pond. reduce the self-pollution of the culture process and reduce the pressure on the pond. It is worth noting that photosynthetic bacteria are also a kind of bacteria, which are also wiped out when disinfectants are used. Four days after general disinfection, the medicine of most chlorine-containing disinfectants has basically disappeared, and we introduce photosynthetic bacteria as soon as possible. If there is no fish disease, generally do not disinfect easily, and do not need disinfection for 60-80 days. But photosynthetic bacteria are not long-term effective. When photosynthetic bacteria are used for 60-80 days, disinfect the whole pond again, and reintroduce photosynthetic bacteria to re-cultivate beneficial bacteria. Photosynthetic bacteria are widely used in shrimp culture, and the four major domestic fish should also be vigorously promoted. At present, in most areas of the Pearl River Delta, not only the water quality of fish ponds is fat, but also there is a lot of organic matter in the water of rivers. The introduction of photosynthetic bacteria can effectively degrade organic matter, especially in fish ponds where there are a large number of pigs and ducks on the edge of the pond. Photosynthetic bacteria should be used.

Ninth, scientific oxygenation as long as the correct use of aerator, the prevention and treatment of fish diseases can also achieve very good results. Mainly? Do you want to pay homage to Lu and fold ⒀ to the south of the land industry? Turn on the aerator for 1-3 hours from 2:00 to 3:00 in the afternoon. First, through the agitation of the water body, it can be aerated to reduce the content of harmful gases in the water; second, it can speed up the oxidation of organic matter in the water body and reduce the oxygen consumption pressure of the organic matter in the fish pond; third, it can increase the amount of dissolved oxygen in the pond water body. The ultimate goal is to create a better living environment for fish, in order to enhance the disease resistance of fish.

Reasonable feeding generally requires that the feed used is nutritionally balanced, and the lower the feed coefficient, the better, so that less feces can be produced. It is necessary to master the correct feeding method so as to minimize the digestive burden caused by fish feed intake and the impact of excessive feeding on the water quality of the pond.