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

An adjustment method and net cage technology, applied in chemical instruments and methods, fish farming, multi-stage water treatment, etc., can solve the problems of slow growth, high risk of breeding, large bait coefficient, etc., and achieve normal growth and smooth mesh , Improve the effect of water quality

Active Publication Date: 2015-03-04
FISHERIES RES INST ANHUI ACAD OF AGRI SCI
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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,

Method used

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Embodiment

[0033] The area of ​​the test cage eel pond is 0.5 hectares, the average water depth is 2.5 meters, and the silt depth is 30 centimeters. There are 440 cages. The size of the cages is 2 meters long x 2 meters wide x 2 meters high. The height is 40 cm, the distance between each row is 3 meters, and the distance between two boxes is 0.5 meters. The area of ​​the cages accounts for 35% of the water area. The cage is sewn from 30 mesh / square centimeter polyethylene mesh. The test period was from January to November 2013.

[0034] The breeding and management techniques of stocking and feeding eel seedlings in test cages are equivalent to the techniques of raising eels in cages which are widely used now. Take the following measures to regulate water quality:

[0035] 1. Breed the fine-scaled pomfret species in the water body outside the cage. On February 15, 1,500 species of pomfret, with an average size of 14 cm, were put into the test pond.

[0036] 2. Periodic use of probioti...

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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 ...

Claims

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Application Information

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IPC IPC(8): C02F9/14A01K61/00
CPCA01K61/00A01K63/04C02F9/00C02F1/50C02F3/34C02F2303/04C02F2301/08Y02A40/81
Inventor 潘庭双江河胡王段国庆凌俊胡玉婷陈小雷
Owner FISHERIES RES INST ANHUI ACAD OF AGRI SCI
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