Because of the large area of ​​water, large-surface fish farming has a certain degree of difficulty in preventing and treating fish diseases. Applying water on a large surface is neither economical nor easily polluting the water. The following six methods can effectively prevent the occurrence of diseases.
Fish species disinfection method: Large-surface fish breeding must select large-scale fish species that are physically robust in the season of fingerlings, and can be released after being disinfected with drugs. Commonly used drugs include bleaching powder, trichlorfon used in fish, salt, methylene blue, etc. These drugs have a certain role in killing bacteria and parasites on the body surface and in the scorpion of fish.
Food sterilization method: pathogens are often brought into the fish body with the bait, so the feed must be clean and fresh, and it is best to be sterilized. Animal foods such as snails and clams should be washed with fresh water and fresh individuals should be selected; plant foods such as aquatic grasses and land grasses should be soaked in bleaching powder solution of 6 mg/l for 20 to 30 minutes. Feeding; Application of organic fertilizer, should add 200 grams of bleaching powder in 1000 kg of manure, stir evenly into the water.
Drug hanging bag method: Drug hanging bags must be set up to fix the food table so that the fish can develop the habit of positioning food. If you are feeding on herbivorous fish, you can use a bamboo raft to make a triangular or polygonal frame and build a floating water table. To hang bags regularly (usually every 20 to 30 days for a course of treatment), bleach powder bag 100 grams per bag, once a day, for 3 days; copper sulphate, ferrous sulfate bag, 100 grams of copper sulfate in each bag, 40 grams of ferrous sulfate was changed once a day for 3 consecutive days. Drug bags should be hung around the food table. Each food table can hold 3~6 bags.
Feeding the bait method: Grass carp and bluefish growing on large water surface are prone to enteritis disease. Digestion is used for prevention during the onset season (5-10 months each year). The first day is the first time for every 10 kilograms of fish weight. Diflufenicidal powder 1 g calculation, after the amount of halving every day, made with adhesives such as secondary flour made of baits to feed fish. In addition, the use of garlic mixed grass or salt grazing grass carp to prevent infectious diseases better.
Chinese herbal medicine prevention and cure method: Chinese herbal medicine can be collected on the spot, with a wide source, low cost, good effect, and no toxic or side effects. Such as Masson pine leaves can prevent enteritis and gill disease of grass carp; black cicada leaves, rhubarb rhizomes can prevent fish gill disease, white head white mouth disease; Euphorbia gracilis, iron chive can prevent grass carp, bluefish, enteritis disease and rotten Diseases; banyan tree roots and stems and leaves can prevent fish parasitic disease; soil Nepeta, Guanzhong can prevent fish capillary nematodiasis; another Chinese herbal medicine roots, stems, leaves after rotting can be fertilizer and water.
Control fertilization method: The large-surface fish culture must control the amount of artificial fertilization. In order to ensure the ecological balance of the water area, it is generally not recommended to over-apply organic fertilizer and inorganic fertilizer. Excessive application of human and animal dung, fish is susceptible to parasitic diseases; over-application of chemical fertilizers, plankton will suddenly reproduce in large quantities, during high temperature easily lead to the occurrence of fulminant fish disease.
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