Ecological repairing method of large-scale marine algae of gracilaria to eutrophication cage culture sea area
A technology for cage culture and ecological restoration, applied in chemical instruments and methods, biological water/sewage treatment, water/sludge/sewage treatment, etc., can solve the problems of accelerating the growth, death and consumption of phytoplankton
Active Publication Date: 2011-11-09
SHANGHAI FISHERIES UNIV
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Problems solved by technology
In addition, high concentrations of nitrogen and phosphorus in fish farming waters can accelerate the growth of phytoplankton, and the rapid growth of phytoplankton may lead to algal blooms, and the toxic species in algal blooms seriously threaten the survival of fish, and the death of algae consumes dissolved oxygen in the water , resulting in fish injury and death
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[0022] Embodiments of the present invention will be further described in detail below in conjunction with the accompanying drawings.
[0023] The implementation place of the ecological restoration method of the large seaweed of the genus Gracilaria to the eutrophic cage culture sea area of the present invention is Nansha sea area, Qiucun Town, Fenghua City, which is located in the middle of Xiangshan Port. There are 5180 seawater cages, which are the main cages in the port. One of the fish farming bases, geographical location E: 121°36′19.08″~121°37′10.92″, N: 29°32′37.68″~29°32′20.4″; it is a regular semi-diurnal tide, with an average tidal range of 2.7~ 3.3m, salinity 25.4-27.5‰, pH 7.83-8.30, August and September water temperature 25.7-31.5°C. In recent years, due to the rapid development of cage fish farming, the fish rafts are densely distributed, and the eutrophication in this sea area has intensified.
[0024] Gracilaria large seaweed of the present invention is to th...
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The invention relates to a method for the ecological remediation of eutrophic net cage culture sea areas by adopting Gracilaria kelp. The method for the ecological remediation of eutrophic cage culture sea areas essentially includes the following operation process: collecting Gracilaria seedlings, long-distance transportation of the seedlings, gripping the Gracilaria seedlings, transferring the seedlings to the sea, hanging seedling ropes in net cages, the ecological remediation of eutrophic net cage culture areas, management and monitoring. After Gracilaria is introduced in the eutrophic netcage culture sea areas on a large scale, a great deal of nutrient salts dissolved in water can be absorbed by Gracilaria for growing, Gracilaria can absorb nutrient salts during growth process, and the surfaces of seaweed bodies can adsorb sludge and other debris which are removed after Gracilaria is reaped; meanwhile, the chlorophyll content in water is lowered, dissolved oxygen content and transparency of water are improved, water quality is improved, the ecological environment of the culture sea areas is repaired, and red tide is prevented from occurring. The method of the invention is applicable to the eutrophic net cage culture sea areas.
Description
Technical field: [0001] The invention relates to an ecological restoration method for eutrophication in sea areas, in particular to an ecological restoration method for large seaweeds of the genus Gracilaria to eutrophication cage culture sea areas. Background technique: [0002] In recent years, the development of sea cage fish farming in my country has reached its peak since its inception. The number of cages has continued to increase significantly. Traditional cage culture harbors have successively formed large-scale cage fish farming bases, resulting in two outstanding problems. First, the net cages are set too densely, and the fish rafts in most large-scale bases are almost connected together, forming a large-scale serious overloaded breeding state; second, the overall breeding capacity greatly exceeds the ecological capacity of the harbor environment, limited The water surface continuously carries hundreds of tons of high-density farmed fish. The comprehensive harm of t...
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IPC IPC(8): C02F3/32
Inventor 何培民徐姗楠温珊珊肖君吴维宁
Owner SHANGHAI FISHERIES UNIV