Method for fishpond water body eutrophication remediation

Abstract

The invention discloses a method for fishpond water body eutrophication remediation and belongs to the technical field of water body ecological remediation methods. The method comprises the steps that water in a fishpond is discharged out, and fish grooves are formed by excavating at three sides of the fishpond 2-3 meters from pond bank feet; in the first ten-day period of June, rice sprouts which just sprout are subjected to direct seeding at a central platform zone; in the first ten-day period of July, fish summerlings which are regular in specification are bred in the fish grooves; during rice growing, the water level is adjusted according to a rice fertility process, and the deepest water level reaches 1.2 m-1.4 m; during growing of the fish summerlings, fodder is thrown into the fish grooves; in the mid-to-late October, rice is harvested; and in May of the next year, adult fish is harvested. According to the method, nitrogen and phosphorus content in aquatic water in a high-temperature season can be obviously lowered, damage to yellow catfish growing is lowered, the yield and the quality of yellow catfish can be obviously improved, meanwhile, high-quality rice can be produced from rice used in the method, compared with the existing remediation technology, the method is economical and effective, sustainable development capacity is high, and the method is accepted by a large number of yellow catfish farmers.

Description

technical field [0001] The invention belongs to the technical field of water body ecological restoration methods, and in particular relates to a method for restoring eutrophication in fishpond water. Background technique [0002] Pond culture is an important freshwater aquaculture method in my country. According to statistics, in 2012, the freshwater pond aquaculture area in my country reached 38.5 million mu, accounting for 43% of the freshwater aquaculture area; the output of pond aquaculture aquatic products reached 18.66 million tons, accounting for 71% of the total freshwater aquaculture output. In order to increase production, pond culture in my country generally adopts an intensive intensive farming model with high stocking density and high feeding amount; a large amount of bait residue and fish and shrimp excreta lead to increasingly serious problems of eutrophication in cultured ponds. At the same time, the discharge of aquaculture wastewater has also aggravated th...

AI Technical Summary

Problems solved by technology

In the past, the models of using rice to purify eutrophic water in aquaculture ponds were mostly two models: in-situ restoration of rice in floating beds and ex-situ restoration of paddy field wetlands. However, these two models have some shortcomings. It is difficult to operate, and it is difficult for the root system of rice planted on the floating bed to penetrate deep into the bottom mud, and the enrichment and repair effect of nitrogen and phosphorus in the bottom mud is poor; the restoration of aquaculture wastewater in paddy field wetland systems is limited by the spatial distribution of aquaculture ponds and paddy fields

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