CN112690255A

CN112690255A - Bottom trawl with bottom release structure

Info

Publication number: CN112690255A
Application number: CN202011561146.5A
Authority: CN
Inventors: 冯春雷; 郁岳峰; 王磊; 周爱忠
Original assignee: East China Sea Fishery Research Institute Chinese Academy of Fishery Sciences
Current assignee: East China Sea Fishery Research Institute Chinese Academy of Fishery Sciences
Priority date: 2020-12-25
Filing date: 2020-12-25
Publication date: 2021-04-23

Abstract

The invention relates to a bottom trawl with a bottom release structure, which comprises a top net, a belly net and two side nets, wherein the top net, the belly net and the two side nets are mutually enclosed to form a trawl net, a float line is arranged at the top of a net opening of the trawl net, a sinking line is arranged at the bottom of the net opening of the trawl net, a V-shaped net wall is arranged on the belly net inside the trawl net, the net wall is vertical to the belly net, the top end of a folded angle faces the trawl net opening, two ends of the net wall are respectively connected with the two side nets, and release openings are respectively arranged on the belly net and the side nets at the connection positions of the net wall and the side. The invention can release non-target catches on a substrate layer or a near substrate layer with heavy weight such as bread snails, is beneficial to improving the operation effect of the bottom trawl net and reducing the labor intensity of manpower.

Description

Bottom trawl with bottom release structure

Technical Field

The invention belongs to the technical field of trawling, and particularly relates to a bottom trawl with a bottom release structure.

Background

In the bottom trawl work of african mauritania, a large-scale bread snail (cymbiumpo) accounts for a large proportion of the caught fish catch, the number of the bread snails is large and the weight is large, but the bread snails are not economical fish catch, thereby hindering the efficiency of the bottom trawl work. The method adopted at present is that after the trawl operation is finished once, the trawl is pulled to the deck to be sorted and abandoned, which not only increases the manpower labor, but also reduces the timeliness of the bottom trawl operation.

Disclosure of Invention

The invention aims to provide a bottom trawl with a bottom release structure, which can release non-target catches on a heavy bottom layer or a near-bottom layer such as bread snails, is beneficial to improving the operation effect of the bottom trawl and reduces the labor intensity.

The technical scheme adopted by the invention for solving the technical problem is to provide a bottom trawl with a bottom release structure, which comprises a top net, a belly net and two side nets, wherein the top net, the belly net and the two side nets are mutually enclosed to form a trawl net, the top of a net opening of the trawl net is provided with a float line, the bottom of the net opening of the trawl net is provided with a sinking line, the interior of the trawl net is positioned on the belly net and is provided with a V-shaped net wall, the net wall is vertical to the belly net, the top end of a folded angle faces towards the trawl net opening, two ends of the net wall are respectively connected with the two side nets, and the side nets at the connection part of the belly net and the side nets are respectively provided with release.

The top net is provided with a V-shaped top head line corresponding to the net wall, and the upper end of the net wall is connected with the top head line through a plurality of hanging ropes distributed at intervals.

The both ends that the both sides of abdominal net are located the geyser are equipped with first abdominal net release mouth and second abdominal net release mouth respectively, first abdominal net release mouth and second abdominal net release mouth are triangle-shaped.

The both ends that lie in the net wall on the both sides side net are equipped with first side net release mouth and second side net release mouth respectively, first side net release mouth and second side net release mouth are the rectangle.

Advantageous effects

According to the invention, the V-shaped net wall structure arranged along the bottom layer abdominal net in the trawl can gather the non-target fishery harvesting objects (mainly aiming at the bread snails) entering the heavy bottom layer or the near bottom layer in the trawl to the release port and release the non-target fishery harvesting objects from the release port, so that the operation effect of the bottom trawl is improved, the non-target fishery harvesting objects are prevented from being fished and then sorted, and the labor intensity of manpower is reduced.

Drawings

FIG. 1 is a schematic structural diagram of the present invention.

Detailed Description

The invention will be further illustrated with reference to the following specific examples. It should be understood that these examples are for illustrative purposes only and are not intended to limit the scope of the present invention. Further, it should be understood that various changes or modifications of the present invention may be made by those skilled in the art after reading the teaching of the present invention, and such equivalents may fall within the scope of the present invention as defined in the appended claims.

A bottom trawl with bottom release structure as shown in fig. 1 comprises a top net 6, a belly net 9 and two side nets 2 enclosing each other to form a trawl net. The top of the net opening of the trawl net is provided with a floating headrope 1, and the bottom is provided with a sinking headrope 12.

The inner part of the trawl netting is positioned on the belly net 9 and is provided with a V-shaped net wall 10, the height of the net wall is 30cm, and the mesh size is 10cm, and the trawl netting can also be adjusted according to the requirement. The top net 6 is provided with a V-shaped top net 5 corresponding to the net wall 10, and the upper end of the net wall 10 is connected with the top net 5 through five hanging ropes 4 which are distributed at intervals, so that the net wall 10 is vertical to the belly net 9. The top end of the folded angle of the net wall 10 faces the net opening of the trawl, and two ends of the net wall 10 are respectively connected with the side nets 2 at two sides.

The belly net 9 at the joint of the net wall 10 and the side nets 2 at the two sides and one side of the side net 2, which is positioned at the net wall 10 and faces the net port of the trawl, are respectively provided with a release port. Wherein, the both ends that the both sides of abdominal net 9 are located the geyser 10 are equipped with first abdominal net release mouth 11 and second abdominal net release mouth 8 respectively, and first abdominal net release mouth 11 and second abdominal net release mouth 8 are triangle-shaped. The two ends of the net wall 10 on the side nets 2 on the two sides are respectively provided with a first side net release port 3 and a second side net release port 7, and the first side net release port 3 and the second side net release port 7 are rectangular.

The V-arrangement net wall structure that sets up along bottom abdominal net in this end trawl can assemble the non-target fishing thing (mainly to bread spiral shell) that enters into inside heavy weight bottom layer of trawl or nearly bottom layer to the release mouth to release the trawl with it from the release mouth, thereby be favorable to improving the operation actual effect of end trawl, avoided needing to salvage the non-target fishing thing and sort on the ship, reduced manpower intensity of labour.

Claims

1. The utility model provides a bottom trawl with bottom release structure, includes top net (6), binder net (9) and both sides side net (2) that enclose each other and close formation trawl netting, the net gape top of trawl netting is equipped with float line (1), the bottom is equipped with heavy line (12), its characterized in that: the inside of trawl netting is located and is equipped with the wire netting (10) of V-arrangement on web (9), wire netting (10) and web (9) are perpendicular and dog-ear top towards the trawl net mouth, the both ends of wire netting (10) are connected with both sides side net (2) respectively and lie in wire netting (10) towards one side of trawl net mouth and be equipped with the release mouth respectively with web (9) and side net (2) of junction.

2. A bottom trawl with a bottom release structure according to claim 1, wherein: the top net (6) is provided with a V-shaped top net (5) corresponding to the net wall (10), and the upper end of the net wall (10) is connected with the top net (5) through a plurality of hanging ropes (4) distributed at intervals.

3. A bottom trawl with a bottom release structure according to claim 1, wherein: the both ends that the both sides of abdominal net (9) are located pocket (10) are equipped with first abdominal net release mouth (11) and second abdominal net release mouth (8) respectively, first abdominal net release mouth (11) and second abdominal net release mouth (8) are triangle-shaped.

4. A bottom trawl with a bottom release structure according to claim 1, wherein: the two ends of the net wall (10) on the side nets (2) on the two sides are respectively provided with a first side net release port (3) and a second side net release port (7), and the first side net release port (3) and the second side net release port (7) are rectangular.