Method for adjusting water quality of eel breeding pond with net cages

Abstract

The invention discloses a method for adjusting the water quality of an eel breeding pond with net cages. The method comprises the following steps: breeding plagiognathops microlepis outside cages, using probiotics preparations, replacing the net cages with large-mesh net cages, putting particles for purifying substrate, and sterilizing water in the net cages. According to the invention, a biological regulation method, a physical regulation method and a chemical regulation method are used for improving the water quality of the eel breeding pond with the net cages, the water quality is excellent and stable, water is not required to be changed in the breeding process, main chemical and physical indexes are all in reasonable ranges, 1 L of water inside and outside the net cages contains less than 0.2 mg of ammonia nitrogen, less than 0.1 mg of nitrite, less than 0.05 mg of hydrogen sulphide, and larger than 5 mg of dissolved oxygen, and the transparency of the water is 35-40 cm.

Description

technical field [0001] The invention belongs to the technical field of aquaculture, and relates to a method for adjusting the water quality of eel ponds in net cages. Background technique [0002] Field eel (Monopterus albus), commonly known as eel, belongs to Osteophytes, Synbranchia, Synbranchidae, and Monopterus genus. It is mainly distributed in China, Vietnam, North Korea, Thailand, and Japan. It is the main freshwater aquatic product in my country. Eel is one of the famous and high-quality fish that has developed very rapidly in recent years in my country. Its main breeding areas are located in Hubei, Hunan, Anhui, Jiangxi, Zhejiang and other provinces in the middle and lower reaches of the Yangtze River. Eel farming has become one of the leading industries in aquaculture in these regions. [0003] For a long time, there are three main methods of artificial breeding of rice field eels: pond culture, paddy field culture and net cage culture; [0004] Setting cages in ...

AI Technical Summary

Problems solved by technology

[0005] Cage culture of rice field eel is currently the main breeding method of rice field eel in my country. This farming method has the following disadvantages: (1) The feed of rice field eel is high-protein compound feed and surimi, and rice field eel excrement and residual feed pollute water quality greatly; ( 2) The mesh is small, generally 30 mesh / cm2, which is easily blocked by sludge, algae, and eel excrement. The water exchange inside and outside the cage is poor, and the water quality in the cage is easy to deteriorate; High morbidity, slow growth, large feed coefficient, low benefit, and high risk of breeding

The water quality adjustment of traditional cage culture rice field eels is mainly based on changing water and splashing quicklime water. Changing water will pollute the environment. If more than 1 / 3 of water is changed at one time, it is easy to cause stress reaction of rice field eels, and it is difficult to carry out in places with poor water sources; rice field eels like acidic environments. Quicklime water is alkaline, if used in large amounts or frequently, it will affect the growth of eels