Fish farming units and professional households have always used the habit of using human and animal wastes to put fish ponds directly. Because human and animal dung can not only be directly used as feed for food-eating fish, but also the energy released in the decomposition process and available nutrients can be used as nutrients for growth of plankton, providing feed for filter-feeding fish, but fresh human and animal dung enters the pool. In the decomposition process, a large amount of oxygen is consumed, which often causes the dissolved oxygen of the fish pond to decrease, causing the fish to float, and the fertilizer effect is affected by the temperature and the pool temperature. It is unstable and difficult to control; some parasites and pathogenic bacteria also enter the pool along with the faeces, which may easily cause Fish disease occurs. If the livestock manure is first introduced into the biogas digester to produce gas, and then the biogas manure is put into the fish pond, it will not only maintain the advantages of direct human and animal manure into the pond, but also overcome its shortcomings. The test results fully prove that the hydrolysis of nitrogen in human and animal manures compared with biogas fertilizers can increase the nitrogen hydrolysis by 15.5%, the ammonium nitrogen by 52.9%, the phosphate by 11.8%, and the dissolved oxygen by 13.8%. At the same time, the number and weight of floating organisms, especially phytoplankton, have increased, and no fish disease has occurred. This fertilization method is simple and easy to promote. First, the amount and method Biogas fertilizer is a kind of organic fertilizer that can be used both as a base fertilizer for fish ponds and as a top dressing fertilizer. 1, biogas residue as base fertilizer. Before the fish is released, the biogas residue is sprinkled into the pond and the amount of fertilizer is determined according to the transportation conditions and the fertility of the fish pond. Generally, it is 1000-1500 kg per mu. 2, biogas slurry fertilizer for top dressing. After the fish are introduced into the pond, fertilization is started from May and applied every 10-15 days. Biogas residue 100--200 kilograms per mu or 300-400 kilograms of water per mu, spread into the pool. Conditions can be directly input. 3, according to the transparency of pond water fertilization. Generally, in the fifth, sixth, ninth and October, the water transparency is less than 30 centimeters on the fertilization; in the high temperature season in July and August, the water can be fertilized at 20 centimeters and can be maintained at about 10 centimeters. 4, according to the season, the weather changes, flexible grasp of fertilizer. In early spring and late autumn, the temperature and water temperature are lower, fish growth is slower, and the amount of food needed is not large, and it can be used less; in the hot season of July, August and September, the gas and water temperatures are high. Fish grow fast, requires large amounts of food, plankton breeds fast, nutrient consumption is high, and can be applied more frequently. 5, biogas fertilizer is not only fertile water quality, promote the growth of plankton, but also for food-eating fish food, so it can be mixed with concentrate material made of extruded particles, feeding directly to eat fish. Second, the matters needing attention 1. As for the effect of marsh fertilizer on the water quality of fertilization, the fish ponds should be used to place filter-feeding fish, mainly white and flower pods, which can account for about 70% of the amount. With some tilapia, salmon and other omnivorous fish. 2. If the biogas fertilizer is made into pellet feed into fish ponds, it is appropriate to stock the edible fish, mainly grass and squid, accounting for about 50% of the input, and then with other fish. 3. Phytoplankton in cloudy and rainy water is poor in photosynthesis, and it is not easy to decompose the active ingredients in biogas fertilizer. Normally, it should be applied on sunny mornings to avoid wasting labor and fertilizer. 4. The newly-extracted biogas residues should be piled outside for 1-2 days to release gases that are harmful to fish growth. 5. For fish farms using biogas fertilizers, the design of the biogas digesters should take into account the effects of gas production and the need for frequent fertilizers in fish ponds. It is advisable to use a mid-tier feed and a semi-automatically discharged biogas digester. 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