Construction and breeding method of grass carp-river crab-snail multi-nutrient-level pond system

Abstract

The invention relates to a construction and breeding method of a grass carp-river crab-snail multi-nutrient-level pond system. A pond is divided into two economic variety production areas, namely a grass carp breeding pond and a river crab breeding pond, and the two economic variety production areas serve as the first-level utilization level of feed nutrients; a snail, silver carp and bighead carpbreeding pond is arranged at the rear end of the grass carp breeding pond and serves as the second-level utilization level of the feed nutrients; submerged plants are planted in the river crab breeding pond and serve as the third-level utilization level of the feed nutrients; residual baits and excrement in the grass carp breeding pond are collected and enter the snail, silver carp and bighead carp breeding pond, organic sediments including the residual baits and the excrement are directly eaten as baits of snails, the snails become natural baits of river crabs, nutrient-rich substances generated by decomposition of the unused residual baits and excrement become nutrient sources of microalgae, reproduction of plankton is promoted, and the biomass of silver carps and bighead carps is obtained through filter feeding of the silver carps and the bighead carps; and the unused nutrient-rich substances are absorbed by the submerged plants in the river crab breeding pond, and the submerged plants are fished and put into the grass carp breeding pond to serve as baits of grass carps.

Description

technical field [0001] The invention relates to a pond cultivation method, in particular to the construction and cultivation method of a grass carp-river crab-snail multi-trophic level pond system. Background technique [0002] The pollution of pond culture to water mainly comes from feed nutrients that are not utilized by breeding organisms. Studies have shown that only 20%-30% of nitrogen and 40%-45% of phosphorus in feed are utilized by breeding organisms, and all other nitrogen and phosphorus are It enters the breeding environment in the form of residual bait, feces and dissolved form, and becomes a nutrient-rich substance that causes water pollution. Therefore, it is the key to solve the problem of aquaculture environmental pollution to improve the utilization rate of feed, so that as many nutrients as possible can be converted into the biomass of cultured organisms, so as to reduce the proportion of nutrients entering the surrounding environment. [0003] Increasing t...

AI Technical Summary

Problems solved by technology

At present, the trophic level of organisms cultured in ponds is very small. Generally, there are one main fish and one mixed fish. The main fish is used to generate economic benefits, and the mixed fish is used to adjust water quality. This traditional culture The lack of trophic level of model organisms leads to poor material circulation, short food chain, and the structure of traditional ponds is simple. If too many cultured species are placed in a pond, it will easily lead to the interaction of different cultured species and reduce the yield.

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