Floating trawl for investigating macroplankton in upper middle water body of inland large water surface

Abstract

The invention relates to a floating trawl for investigating macroplankton in an upper middle water body of an inland large water surface. The floating trawl comprises a trawl bag, trawl lines, corks, sinkers and support rods which are tie up, wherein the trawl bag comprises a trawl body, a packing trawl and wing trawls, the trawl lines include force lines, an upper line, a lower line, a cork line, a sinker line and fork lines, a radial cross section of the trawl bag gradually shrinks from the front to the rear, a larger opening end of the trawl body is connected with the wing trawls, the smaller opening end of the trawl body is connected with the packing trawl, an outlet is arranged at the rear end of the packing trawl, and a tying rope is arranged at the outlet of the packing trawl. The floating trawl has the advantage that a floating trawl with operating water depth larger than 2.00m is provided for specially investigating the macroplankton in the upper middle water body of the inland large water surface, is mainly used for investigating and sampling work of biological larvae like basic production, plankton, fish, shrimps and crabs on the inland large water surface, and fills the blank of the biological investigation field for the macroplankton in the upper middle water body of the inland large water surface.

Description

technical field [0001] The invention belongs to the field of biological investigation on inland large water surfaces, in particular to a floating trawling net for the investigation of large-scale plankton in the middle and upper layers of water bodies on inland large water surfaces. Background technique [0002] At present, in the inland large water surface upper water body, especially in the inland large water surface with an operating water depth of more than 2.00m, in order to understand the biological situation of the water body and scientifically develop the large water surface, it often involves the treatment of biological larvae such as plankton, fish, shrimp, and crabs. Investigate sampling operations. In the investigation and sampling operation, different investigation and sampling nets are required. For example, phytoplankton are generally sampled with plexiglass water collectors, and cladocera and copepods are filtered with phytoplankton nets. However, the prior ...

AI Technical Summary

Problems solved by technology

However, the prior art does not have professional survey trawls for macroplankton in large inland water surfaces

Although there are marine fishery fishing nets of "two-vessel surface winged single-bag trawl", they cannot be used on inland large water surfaces, and there is no basic technical figure for plankton nets, so they cannot be manufactured, because the above-mentioned trawls do not have a specific The basic data that are accurate, reasonable, and correspond to each other are not operable and repeatable in actual work and production

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