Seawater mullet purification and restoration of inland eutrophic freshwater waters

Abstract

The invention discloses a method for purifying and restoring an inland eutrophic freshwater area by using seawater mullets, and relates to a method for purifying and restoring the inland eutrophic freshwater area by transplanting seawater fish. A biodetritus food chain centering on mullets is constructed by transplanting and releasing seawater mullets in the enclosed area of the inland eutrophic freshwater area and adopting closed fishing, the swallowing of organic matters and the filtration of floating algae under the cooperation of blue algae in the dormancy stage and the germination stage are adopted to purify and restore, and the transfer flow ways of the organic matters in the water area are increased to convey the organic matters of deposits in the water area out of water and a substrate and reduce the background values of the organic matters and the blue algae in the water area, so the mullets grow and propagate for many years, the carbon sink fishery of the mullets is valued, and the water area purifying and restoring capability is reinforced, thereby the alga control purification and restoration effect of the water area can be realized. The method reinforces the water purifying and restoring effect through fish transplantation and improves the water area purifying and restoring capability without a species invasion risk, and is a water purifying and restoring and alga control method suitable for lakes, rivers, reservoirs, landscape water and wetland characteristic water areas.

Description

technical field [0001] The invention relates to a method for purifying and repairing inland eutrophic freshwater waters for fish, and in particular to a method for transplanting marine fish in near-shore estuaries—mullet to inland eutrophic waters and purifying and repairing the water environment. It is suitable for purification, restoration and algae control methods and activities of inland eutrophic freshwater waters characterized by lakes, rivers, reservoirs, landscape water bodies, and wetland systems. Background technique [0002] In 2006, among the 408 surface water monitoring sections of 197 rivers in my country's seven major water systems (including national border rivers), the proportions of sections with water quality ranging from Grade IV to V and inferior to Grade V were 28% and 26%, respectively. The water quality of the Liaohe River, Huaihe River, Yellow River, and Songhua River is poor, and the Haihe River is seriously polluted. The health of the water ecosyst...

AI Technical Summary

Problems solved by technology

[0008] The purpose of the present invention is to overcome the lack of purification and repair ability of the existing large water surface environment, the species of fish that purify and repair algae control in the freshwater water environment is rare, the food chain of water purification fish is lacking, and the ability of fish to transform organic matter to purify water is insufficient, and to provide a seawater The method for purifying and repairing inland eutrophic freshwater water environment by mullet, strengthens the ability of purifying and repairing algae in water area, this method is low in cost, easy to operate, and does not have secondary pollution; since mullet is a seawater fish, it is an exotic in freshwater waters species, so the species of purification and restoration organisms have been added, but they can only grow but not reproduce in fresh water, and there is no increase in the number of mullets; increase the production of aquatic products in the process of transforming and utilizing organic matter in the water environment, and purify and restore water bodies , in freshwater waters to play the carbon sink fishery value of mullet, increase economic and social benefits, the population of mullet decreases with fishing, and there is no ecological risk of species invasion