Water conservation fishery method capable of improving water quality of lakes and reservoirs intermediately and lightly eutrophicated

Abstract

The invention provides a water conservation fishery method capable of improving water quality of lakes and reservoirs intermediately and lightly eutrophicated. The method is characterized by comprising the following steps of: (1) selecting lakes or reservoirs heavily, intermediately or lightly eutrophicated; (2) selecting the whole lakes with an unifrom eutrophicated level or main polluted areas of the lakes to release chubs and fat head fishes in large quantity, wherein the area for cultivating the chubs and the fat head fishes is more than two thirds of the pollution area; (3) releasing thechubs and the fat head fishes, which are one year or two year old, at the same time, controlling the total density of the chubs and the fat head fishes between 5 and 100g / m<3> according to the eutrophicated level of the water body, and controlling the total weight ratio of the chubs to the fat head fishes to be between 1:4 and 4:1 according to water conditions; and (4) when the chubs and the fat head fishes are released, controlling the quantity of predacious fishes to be below 0.05g / m<3>, and simultaneously releasing or additionally cultivating fishes which eat organic debris and of which thereleasing quantity is controlled between 0.5 and 20g / m<3>.

Description

Technical field: [0001] The invention relates to a water conservation fishery method, in particular to a water conservation fishery method for improving the water quality of medium and light eutrophic lakes and reservoirs. Background technique: [0002] The eutrophication of lakes and reservoirs is still the most important water environment problem faced by our country and the world at present. With the increase of population, the process of urbanization and the development of industrial and agricultural production, the pressure of eutrophication on lakes in our country will continue to increase. continue living. The emergence of lake eutrophication not only seriously weakens the ecological function of the water body, but also destroys the health and stability of the aquatic ecosystem, and the resulting frequent outbreaks of toxic algae (cyanobacteria) blooms have also directly affected people's awareness of The effective use of water resources affects the sustainable devel...

AI Technical Summary

Problems solved by technology

However, this method is often difficult to deal with or has a poor treatment effect on filamentous algae and large colony algae such as Microcystis blooms; the non-classical biological manipulation methods proposed and adopted in China mainly aim at utilizing Bighead carp control cyanobacterial blooms in eutrophic or hypereutrophic lakes without aiming to improve their water quality