At present, the implementation of biogas debt projects in various regions is an important measure for building a new socialist countryside and developing a resource-saving and environment-friendly society. The production of biogas using crop straws and livestock manure and other organic materials, and the use of biogas lighting and cooking, not only use resources, but also save energy. However, the by-products of biogas production, such as the use of biogas residue and biogas slurry, are a new problem that people need to solve. In fact, biogas slurry contains a variety of amino acids and trace elements that can be used for fish farming. This technical point is briefly introduced as follows for reference.
Biogas residue requirements Biogas residue can be directly put into the pool as a bait for fish, but also can be mixed with artificial feed to feed fish. The biogas slurry does not need to be separated by solid-liquid separation. It can be spilled directly into the fish pond to cultivate plankton. Biogas residues and biogas slurry can be applied alternately or at the same time. Biogas slurry has a certain degree of reducibility, and it should be used for more than 3 hours after it is removed from the biogas digester. It should be noted that there is no well-fermented biogas residue biogas slurry, which will consume a large amount of oxygen in the pond water after being applied to the fish pond, especially in the hot summer season, and it is better to use less or not.
The fish species use biogas residue and biogas slurry to raise fish. There is no special requirement for the fish pond, but the water depth is preferably more than 1.0 meters and the water is free of water and other debris. The method of polyculture of filter-feeding fish and food-eating fish can be adopted. Generally, about 30% of filter-feeding fish can be stocked, 40% to 50% of omnivorous fish, and 20% to 30% of herbivorous fish. , eel, eel, eel, grass carp, eel, herring and so on. The amount of application can be determined based on the supply of biogas residues and biogas slurry. High-yielding culture ponds can also be fed with commodity feeds to increase the number of feeds. It is a good way to launch fish species with different specifications and implement round catch and rotation.
Management points The application of biogas residue and biogas slurry should be determined according to the specific conditions of the fish pond. Normally, the surface water per mu can not exceed 300 kg/time, and the amount of biogas residue should not exceed 150 kg/time. Not more than 3 applications per week. The application should be carried out on a sunny day, and it can be used once every other day, using the Quanchiposa method. Biogas residue can also be applied at different points, adhere to the principle of fixed point. The specific control method can be determined according to the season and the water quality of the fishing pond. Generally in April ~ May, October ~ November, the transparency of the control pool is not less than 25 cm. If the transparency of water is lower than the above standard, biogas residue and biogas slurry cannot be applied. During the hot summer, care should be taken to find that the floating head of the fish should be stopped; hot weather and thunderstorms are best avoided. The application of biogas slurry and biogas residue should not be excessive, and should adhere to the principle of a few times. If there is an oxygen deficiency phenomenon such as fish floating head, it is necessary to take oxygenation measures in time, or add new water as soon as possible; if fish disease is found, it is necessary to find out the reason and prescribe the right medicine.
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