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Fish grading device

A grading device, a technology of slender parts, applied in fish sorting, fishing, fish farming, etc., can solve problems such as fish injury

Inactive Publication Date: 2007-01-03
GRADING SYST UK LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

There is such shortcoming in this existing fish grading device: when fish tries to break free from the net hole, fish can be injured because of stumbling and being stuck in fishing net

Method used

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Examples

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Embodiment Construction

[0023] see figure 1 , a fish grading device 1 is formed by a generally rectangular array of meshes 2, each mesh 2 being composed of substantially rigid elongated members, preferably four said substantially rigid elongated members , More preferably, be surrounded by two long tubes 3 and two short tubes 4 installed on the fishing net line 5-loop, wherein the long tubes and short tubes are all made of plastic materials. Each loop of the fishing line 5 is formed by crimping both ends of the loop together with a metal crimp 6 . Each pipe 3,4 is free to rotate about its longitudinal axis so that when a fish scrapes against the pipe 3,4, it will cause the pipe 3,4 to rotate, thereby avoiding fish snagging on the pipe.

[0024] For example, as shown at position 7 in the figure, two looped fishing net lines 5 pass through the pipes 3 and 4 constituting two adjacent mesh holes. In this way, the pipe fittings 3 and 4 can be used to prevent the size of the mesh 2 from becoming smaller w...

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PUM

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Abstract

The device 1 is formed from an array of generally rectangular apertures 2, each of which is formed by two long tubes 3 and two short tubes 4 of plastics material mounted to a loop of fishing net 5. Each loop of fishing net 5 is formed by crimping the ends of the loop by means of a metal crimp 6. Each of the tubes 3, 4 can rotate freely about its longitudinal axis, so that a fish brushing against a tube 3, 4 will cause the tube to rotate, and will therefore avoid becoming snagged on the tube. When such a fish grading device 1 is included in a fishing net and the net is dragged through the water, small fish are able to swim through the rectangular apertures 2, whereas larger fish are not. Thus only fish of a desired minimum size are caught.

Description

[0001] This application is a divisional application for the invention patent application whose application number is 00815253.5 (international application number is PCT / GB00 / 04208), the title of the invention is "fish grading device", and the application date is November 3, 2000. technical field [0002] The present invention relates to a fish grading device, particularly, but not exclusively, to a fish size grading device incorporated into a fishing net. Background technique [0003] Fish grading devices are known and consist of a fishing net with meshes of such a size that fish over a certain size cannot swim through the net and thus become trapped in the net , while smaller fish can escape through the meshes of the fishing net. There is such shortcoming in this existing fish grading device: when fish tried its best to break free from the mesh, fish would be injured because of stumbling and being stuck on the fishing net. Contents of the invention [0004] Preferred emb...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): A01K75/00A22C25/04B07B1/46A01K61/00A01K61/90A01K73/02
CPCA01K61/001A01K75/00A01K61/90B07B1/46
Inventor 艾弗·吉尔伯特·约翰逊
Owner GRADING SYST UK LTD
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