River migratory fish trapping method

Abstract

The invention provides a river migratory fish trapping method. A river migratory fish trapping device is adopted for trapping, and the river migratory fish trapping device is of a splayed dustpan structure, and comprises inducing mesh walls, a riverbed netting, a plurality of fixed piles and a fish collecting part. The inducing mesh walls comprises the splayed inducing mesh wall arranged close to the river bank side and the inducing mesh wall arranged close to the river center side, the shape of the riverbed netting is the same as the surrounding shape of the inducing mesh walls, and narrower end of the riverbed netting and the inducing mesh walls form a contraction opening to be connected with the fish collecting part. Before trapping is carried out, the river migratory fish trapping device is laid on a fish migratory river channel along the river bank through the fixed piles, the inducing mesh wall close to the river bank side is parallel to the water flow direction of a river, the inducing mesh wall close to the river center side forms a 45-degree angle with the water flow direction, and baits are additionally arranged on the riverbed netting; after trapping is completed, the riverbed netting is slowly lifted to the water surface gradually from the wider end to the narrower end of the riverbed netting, so that trapped fishes are driven to swim to the fish collecting part actively.

Description

technical field [0001] The invention belongs to the technical field of acquiring river migrating fish, and in particular relates to a method for trapping river migrating fish. Background technique [0002] In recent years, due to the construction of river hydropower stations and other projects, the vertical connection of rivers has been blocked, and the continuous geographical space of upstream and downstream water bodies has been blocked, which has continuously had a great impact on the biological processes of migratory fish, resulting in serious resource decline. Many species are even on the verge of Therefore, the protection of migratory fish resources has increasingly received national attention and attention from all walks of life. In the Yangtze River Basin, the cascade development project of water conservancy resources in the upper reaches of the Yangtze River clearly requires the adoption of supporting migratory fish protection measures. Due to the narrow river cour...

AI Technical Summary

Problems solved by technology

Cage pots and traps are commonly used trapping nets at present, and cause less damage to the target fish body, but the trapping effect is not good

Images