Silt tidal creek fish capturing device and quantitative fish density sampling method

Abstract

The invention relates to a silt tidal creek fish capturing device and a sweep net device for driving tidal creek fish. The capturing device comprises rectangular nettings, a net bag, a frame line net piece, a triangular sweep net and the like. In combination with the landform feature of a tidal creek and the rising tide feature of tides, the silt tidal creek fish capturing device and a quantitative fish density sampling method are designed. By means of the method, the total density of the silt tidal creek fish can be monitored in a quantitative mode, the density of all kinds of fish can be calculated as well, and the types of the fish entering the tidal creek and the density difference in different tidal water depths can be calculated, so that searchers can know the influence mechanism of the tidal creek on the fish habitat strategy. The silt tidal creek fish capturing device and the quantitative fish density sampling method have the advantages of being easy to operate, capable of saving cost, capable of saving labor and the like and particularly suitable for quantitative monitoring of the density of the silt tidal creek fish.

Description

technical field [0001] The invention belongs to the technical field of fish fishing in silty tidal creeks, and in particular relates to a fishing device for fish in silty tidal creeks and a quantitative sampling method for fish density. Background technique [0002] A tidal trench is an important geomorphic unit of the muddy intertidal wetland sub-habitat, and one of the most active development factors in the tidal flat habitat. One side of it starts to develop from the salt marsh, and changes direction and size continuously with the erosion of the tidal current. , when the final stable formation, the width of the tidal channel can reach more than ten meters to hundreds of meters, and the depth of the tidal channel can be as deep as 1 to 3 meters. Due to factors such as deep water depth and long tidal water retention time in tidal trenches, some fish (such as gobies) will first enter the intertidal waters for activities and large individual fishes live and forage in this wat...

AI Technical Summary

Problems solved by technology

However, because muddy tidal channels are generally deep, tortuous, and sometimes very narrow in width, it is difficult for ships to enter, and trawling surveys cannot be used like offshore waters.

However, the use of nets such as tidal flat fixed nets and ground cage nets cannot achieve quantitative sampling of the number and density of fish.

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