The temperature in spring began to rise gradually, and all types of fish ponds began to be stocked with fry aquaculture. Various kinds of metabolites in fish ponds are increasing, and pathogenic parasites that endanger fish will gradually become active. To this end, all fish farmers should do a good job of disinfecting fish ponds in the spring.
First, clear pond disinfection
The digging of fish ponds and old ponds to clean up the dredging should be done well. Generally, one meter deep per acre puts 75-100 kilograms of lime on the surface of the water, 50 kilograms of camellia crushed and soaked the water all night. The whole pond is evenly spattered. It is also possible to sprinkling the tea bran after splashing the lime and spilling the tea bran before pouring lime. 3-5 hours. Lime kills wild fish, viruses, bacteria, and parasites, neutralizes acidity, releases nutrients, improves sediment and water quality, making the water slightly alkaline, and tea bran can kill wild as it contains soap. Miscellaneous fish and certain pathogenic parasites breed water quality. After the toxicity, tea bran is also a kind of food that fish seedlings like to eat. The overwintering fish ponds should be disinfected 1-2 days before planting. Water 1 meter per mu should be disinfected and sterilized with 1 kg of bleaching powder, and then fish seedlings should be placed in ponds.
Second, fingerling disinfection
Regardless of how carefully handling the nets, when catching fish seedlings, they are frightened and frightened by fish. It will inevitably scratch the fish and infect or breed bacteria and parasites. Therefore, the fish seedlings need to be sterilized with 4% salt water for 10-15 minutes before being dropped, and then slowly put into fish ponds for breeding to reduce the future mortality.
Third, food field disinfection
Food sterilisation is very important. It can save the cost of cultivation, and the disinfection of food premises can be adapted to local conditions. Chemicals are mainly used in the plains, and herbal medicines can be used in the mountains to save costs and reduce pollution. Food field disinfection generally has the following methods:
Bleaching method
In fish ponds, food establishments usually use bamboo poles to form triangular or square food racks, depending on the size of the food market. Generally, each food farm is hung with 3-6 pieces, each of which has 3-5g of bleaching powder (there can be used plastic bag to disperse the bleaching powder, pierce several small holes with the tip to allow the water to enter and exit), and hang it around the food shelf. Bamboo篓 slightly exposed from the water. After the bamboo poles are hung, put the feed on the shelves and hang them for 3-5 days each time.
Copper sulphate and ferrous sulfate mixture bag hanging method
3-6 bags were hung on the fish pond food shelf. Each bag contained 5 grams of copper sulfate and 2 grams of ferrous sulfate. Each time the medicine was hung for 3 days, the dressing was changed once a day. The bag is required to be fine, so that the liquid will not disappear quickly, and it will last for at least 8 hours before it is dissolved and it meets the standard.
Chinese herbal medicine
The commonly used Chinese herbal medicines are the green pine hairs, the leaves of maple, the branches and leaves of buckwheat. During the epidemic season of fish disease, soak in the food field 1-2 times per month. The method of immersing is to use fresh green pine hairs, each of 25 kg of maple tree branches and leaves, and buckwheat twigs and leaves in each food field, and divide them into 5-6 bundles, soak them around the food market, and take them out after 7-10 days. Dried, burned ash can be used as base fertilizer.
Fourth, fish ponds are fully sterilized
1, according to the water depth of 1 meter per acre, with a chlorine content of 30% of the bleaching powder 1 kg whole pond even spilled, can prevent bacterial fish disease, twice a month.
2. One meter of water per acre of water depth, the whole pool of 20 kg of quicklime water is sprayed evenly, which can prevent rotting disease once every 20 days.
3, 1 meter water depth per acre, with 90% crystal trichlorfon 0.2 kg of water dissolved Quanchiposa, you can kill the Chinese fish larvae, anchor head larvae.
4. Each month, copper sulfate and ferrous sulfate mixture (5:2) is splashed in the whole pool, which can kill parasites and blue-green algae produced by excessive water bodies.
Disinfection of the fish ponds should be arranged according to the weather, water temperature, and fish movements. The weather is normal, the water temperature is normal, and the fish school can splash the syrup at 3-4 pm if there is no abnormality; if the storm is heavy, the air pressure is low, the water temperature is too low, and the anoxic floating head and fish school have abnormalities, they cannot be used, otherwise the water environment will worsen and increase. Fish diseases cause economic losses.
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