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Method for controlling eutrophication of fish farming area in freshwater cage by floating plants

A net cage fish farming and eutrophication technology, which is applied in the fields of botany equipment and methods, chemical instruments and methods, biological water/sewage treatment, etc., can solve the problems of eutrophication in freshwater net cage fish farming areas, etc. To achieve the effect of solving ecological and environmental problems, the operation method is easy to learn, and easy to promote

Inactive Publication Date: 2013-09-11
SHANGHAI OCEAN UNIV
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  • Abstract
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Problems solved by technology

Before this patent application, there was no successful example of using floating plants to control eutrophication in freshwater cage fish farming areas and combine production applications

Method used

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  • Method for controlling eutrophication of fish farming area in freshwater cage by floating plants

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Embodiment 1

[0033] Using the floating aquatic plant Nectarina chinensis, the eutrophication environment restoration test was carried out in the cage fish culture base of Yingwu Fishery in Yichang, Hubei Province from August to October 2011. The water temperature in the cage fish culture area was 20-36°C. The size of the cage is 5×4×2.5m, and the initial stocking water lily is 1.74kg / m 2 .

[0034] Taking 1 net cage as an example, the results are as follows: 34.75kg of water floating lotus were initially stocked, and the input of nitrogen and phosphorus into the water by the initially stocking water floating lotus was 30.17g and 6.4g respectively. During the test period, there were 3 harvests (the density of water lilies before the first harvest was 1.74kg / m 2 , the weight of the first harvest of water lettuce is 56.25kg, the weight of the second harvest of water lettuce is 69.75kg, and the third harvest of water lettuce weight is 64.0kg).

[0035] It is calculated that a total of 189.5k...

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Abstract

The invention relates to the field of control to eutrophication of fish farming areas in freshwater cages, in particular to an ecological restoration method for controlling the eutrophication of a fish farming area in a freshwater cage by floating plants. The method comprises the following steps: 1) floating aquatic plants are put into the freshwater cage, and the density of the floating aquatic plants put initially is smaller than 2.3 kg / m2; and 2) after the density of the floating aquatic plants is larger than 5.6 kg / m2, the floating aquatic plants are recovered so as to cause the density of the recovered floating aquatic plants to be smaller than 2.3 kg / m2. In the invention, floating plant cultivation and cage culture are combined, repaired living beings can decorate the water lever to have an ornamental value, above all, the eutrophication of the fish farming area in the freshwater cage is relieved by a simple method at very low cost remarkably, and the ecological environment problem unsolved for a long time is effectively solved. Therefore, the method provided by the invention has prominent ecological benefits, social benefits and economic benefits.

Description

technical field [0001] The invention relates to the treatment of eutrophication in a freshwater net cage fish culture area, in particular to an ecological restoration method for treating the eutrophication in a fresh water net cage fish culture area with floating plants. Background technique [0002] Cage fish farming is an important method of intensive aquaculture in natural waters in my country. However, during the breeding process, a large amount of residual bait and fish excrement (feces, etc.) directly enter the farming waters, increasing the content of organic matter in the water body, resulting in water richness. Nutritization not only pollutes the environment, but also endangers the breeding industry. In recent years, the bioremediation technology centered on higher aquatic plants has been widely used in the pollution prevention and control of domestic sewage, industrial wastewater, aquaculture sewage, eutrophic lakes, rivers and other water bodies. It has the advanta...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C02F3/32A01G1/00
Inventor 马旭洲李猛王武
Owner SHANGHAI OCEAN UNIV
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