Fish community biomass control-based method for maintaining steady state of urban grass-type lake

Abstract

The invention discloses a fish community biomass control-based method for maintaining a steady state of an urban grass-type lake. After a grass-type ecological system is constructed, by utilizing filter-feeding characteristics of different fishes, 80% of fish biomass or more is removed at a time, and it is guaranteed that carnivorous fishes of the remaining fish biomass account for 20% or more; biomass removal of fishes is performed a time according to the steps every 2-3 years, and meanwhile, it is guaranteed that the fish biomass removed each time is greater than 80% of the total biomass ofthe fishes. The method has the beneficial effects that a reasonable fish removal method, fish removal ratio and fish removal frequency are set by utilizing the filter-feeding characteristics of the different fishes, and thus, the turbidity steady state of water can be broken, and is turned into a clear water state so as to achieve the goals of maintaining the transparency of the water and stabilizing the grass-type ecological system, and the management cost of ecological restoration is reduced. In addition, caught fishes can also be sold as green high-end meat to obtain incomes.

Description

technical field [0001] The invention relates to the technical field of water body ecological environment management, and more specifically, to a method for maintaining the steady state of urban grass-type lakes based on fish community biomass regulation. Background technique [0002] After the ecological restoration of the lake in the lakeside city and the construction of the grass-type ecology has been completed, when the density of fish and other consumers in the water body is too high, the structure and function of the "clear water state" grass-type ecosystem will be degraded, and the ecological services of the grass-type ecosystem will be affected. Functions developed, optimized and integrated. At present, fish regulation is one of the most important contents of aquatic animal biomass regulation. Fish are often at the top of the food chain in aquatic ecosystems. By regulating fish, a chain reaction of "downward effect" is caused to regulate the structure and function of...

AI Technical Summary

Problems solved by technology

Too many zooplankton-eating fish will weaken the downward control of zooplankton on phytoplankton, resulting in a large number of phytoplankton blooms; less carnivorous fish is not conducive to the control of phytoplankton; in addition, herbivorous fish and omnivorous fish Too much is not conducive to the recovery or population growth of aquatic plants. In some cases, too many herbivorous fish and omnivorous fish can even cause the grass-type "clear water" system to transform into an algae-type "turbid water" system

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