CN212787080U

CN212787080U - A contraction type pipe form selectivity device for euphausia superba trawl

Info

Publication number: CN212787080U
Application number: CN202020892106.8U
Authority: CN
Inventors: 黄洪亮; 刘健; 李灵智; 杨嘉樑
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: 2020-05-25
Filing date: 2020-05-25
Publication date: 2021-03-26
Anticipated expiration: 2030-05-25

Abstract

The utility model relates to a contraction type pipe shape selectivity device for euphausia superba trawl, including the euphausia superba trawl, the euphausia superba trawl includes longeron, head line, foot line, curb line, lid net, flank net and body net, and the body net is equipped with ten sections, and the ninth section of body net adopts pipe type selection device structure, and the ninth section front end of body net is equipped with pipe type induction net piece, and the front end length of pipe type selection device structure is unanimous with the taut length of body net clothing mesh in front of the ninth section of body net; the back part of the net clothing of the duct type induction net piece is cut in a unilateral mode until the tail end of the duct type induction net piece is connected with the back part of the front end of the tenth section of the body net to form a closed state; the back part netting of the duct type induction net piece and the abdomen part netting of the duct type induction net piece are symmetrically cut and contracted at two sides, so that the middle part of the netting of the duct type induction net piece keeps one third of the mesh number, and the middle part of the netting of the duct type induction net piece and the side part netting of the duct type induction net piece are sewn and fixed.

Description

A contraction type pipe form selectivity device for euphausia superba trawl

Technical Field

The utility model relates to a trawl fishing tackle selectivity device of ocean fishery, especially the selectivity device of the trawl fishing tackle of fishing euphausia superba.

Background

The polar region is a strategic Xinjiang region which is highly concerned internationally and integrates politics, economy, law and safety into a whole. The Antarctic continent is surrounded by vast oceans, and the Antarctic treaty and the environmental protection protocol thereof freeze the territorial ownership requirements and mineral exploitation activities of seven countries, and only biological resources can be developed and utilized. Antarctic krill is one of key species in the Antarctic ocean ecosystem, has rich resource quantity, is distributed around Antarctic, has the resource storage quantity of 6.5 to 10 hundred million tons, and is an important strategic resource concerned by all countries in the world at present. In order to promote sustainable development of antarctic krill fishery in China, a special project of national science and technology key research plan is specially set in the field of ocean environment safety in 2017, wherein efficient and continuous fishing of antarctic krill is used as key content to carry out standing research, so that the unfavorable situation that the comprehensive competitiveness of the antarctic krill fishery in China is not strong is expected to be reversed, the actual existence of China in the polar fishery management is practically guaranteed, and the national polar ocean rights and interests are maintained.

Since the resources of Antarctic krill were commercially developed in the 80's of the 20 th century, trawling, purse seine and trawling were tried, but only one trawling operation mode is reserved through years of production practice.

According to the expansion mode of the euphausia superba trawl fishing gear, 2 types are mainly adopted: one is to keep the horizontal expansion of the netting gear by the trawl door; the other is to keep the net horizontal expansion through the trusses at the front end of the net opening. The trawl fishing operation mode of the otter board, because the otter board can keep stable under certain dynamic conditions, so the acquisition of the fishery at each time needs to be realized by a complete process of putting, fishing and pulling up the net, simultaneously, in order to fully expand the netting gear and the otter board, the trawl gear is ensured to be in a better operation state by respectively configuring trawls, the otter board, handrails, headropes of the netting gear, floaters, descendants, sinkers, sidelines, cross ropes and the like on the left and right, and because the connection between the ship and the net involves more parts, the distance between the trawl gear and the ship is far, so the whole fishing operation process is time-consuming and labor-consuming, the effective trawling time is influenced and the fishing yield is influenced; the operation mode of the trussed-beam trawl fishing is characterized in that the operation form of the net is mainly controlled by the length of the trussed beam preset at the front end of the net opening, the horizontal expansion of the net opening is stable and is not easy to deform, compared with a otter board trawl, the connection between the trawls and the trawls only needs to be configured with a single trawl, a trussed beam, a floating ball and sinking force, and the operation state of the trawling fishing gear can be ensured by adding a head line, a side line, a foot line and the like, the trawling net is relatively close to a ship, and the quick operation of net hauling and net releasing and the quick. Meanwhile, due to the operation mode of the boom trawl fishing, the trawl fishing can be performed only by a single trawl, if a support rod is additionally arranged on the ship 2 side and a trawl traction point is arranged, trawl fishing can be performed on the ship side 2 from the port and the starboard, the fishing efficiency is improved by times, and the method is the most efficient operation mode for fishing the antarctic krill at present.

According to the requirements of the Antarctic ocean organism resource conservation Commission on polar fishery management, the Antarctic krill trawl fishing gear has to have a mammal release function and provide corresponding design and instructions, otherwise the euphausia superba trawl gear is rejected into the fishery. Meanwhile, according to the fishing application, only the fishing object of the application can be fished, for example, the antarctic krill fishery can only fish the antarctic krill, but necessary measures are adopted to avoid that the antarctic krill fishery also catches other fish resources, once the quantity of the fishes and the fishes reaching or exceeding a certain proportion are determined as default behaviors, the fishing qualification can be forcibly cancelled, the destructive influence on the production is caused, and high attention is also paid to the production. The method is characterized in that special antarctic krill national or international observers carry out sampling investigation with ships about the varieties and the quantity of the euphausia superba fishery, the observers form observer logs according to investigation and analysis results, the observer logs are reported to the antarctic marine biological resource maintenance committee at regular time, professional organizations related to the committee carry out result inspection and evaluation, and the results are finally published in annual meetings. Therefore, the research and development of the selective device capable of reducing the fish catching capacity of the antarctic krill fishery has a very important promotion effect on the development of the antarctic krill fishery.

According to the prior Euphausia superba trawl mammal release device, the following 2 structural types are mainly adopted: one is a mesh-induced release device which releases by adding a separate mesh extending from the abdomen to the back and interconnected with a side net at the body net. The separation net sheet is composed of netting with mesh size of about 0.2m, 2-3 rhombic or rectangular meshes with size of 1.6m are respectively arranged at the front part of the joint of the separation net sheet and the back net, and the separation net sheet is used for escape windows of mammals or fishes. On one hand, the device is difficult to release varieties which are caught in time due to too few escape windows, so that the mistaken catching is caused; on the other hand, the hooking or friction damage in the net lifting and releasing process is easy to generate the damage of the connection part, so that the species which are caught simultaneously enter the net bag to be caught by mistake. The other is a rigid separation fence release device which is vertically and directly arranged at the position of the body net, the front part of the separation fence is provided with an escape window, the distance between every two adjacent separation fences is generally 0.1-0.2m, and the rigid separation fence release device is used for directly intercepting or screening mammals and fishes to enter the net. Because the device is of a rigid structure and has low fusion degree with the netting gear, the trawl operation is difficult, and the device is rarely used at present.

At present, after the Antarctic krill fishery in China is cultivated for nearly 10 years, the Antarctic krill trawl is mainly carried out in a otter board trawl operation mode, the release of mammals adopts a mesh induction type release device, the phenomenon of mistaken catching of the mammals entering into the net sacs is found for many times, the high attention of production enterprises and the Antarctic marine organism maintenance committee is attracted, and the selection and release effects of netting gears are urgently needed to be improved.

SUMMERY OF THE UTILITY MODEL

For solving present antarctic krill trawl, especially antarctic krill longeron pump suction high efficiency is in succession caught the difficult problem of catching and releasing to what mammal and fish in the operation process, the utility model provides a pipe formula selectivity device that is used for antarctic krill pump suction to catch reduction mammal and fish and catch concurrently in succession.

The utility model discloses mainly to the high-efficient swimming action of catching the type in succession of trawl in-process difference concurrently of beam pump suction that present antarctic krill was catched to the high efficiency, the development is fit for the selecting arrangement and the method of different objects, realizes the selection and the release of catching the object concurrently to the difference, has improved the release efficiency of antarctic krill trawl fishing tackle, promotes the ecological function of antarctic krill fishery. The utility model is also suitable for catching and releasing other trawlers.

The utility model provides a contraction type pipe shape selectivity device for euphausia superba trawl, including the euphausia superba trawl, the euphausia superba trawl includes longeron, upper border line, lower border line, outline, lid net, flank net and body net, its characterized in that, the body net is equipped with ten sections, the ninth section of body net adopts pipe formula selector structure, the ninth section front end of body net is equipped with pipe type induction net piece, the front end length of pipe type selector structure with the body net ninth section front end clothing net tensioning length unanimous;

the back part netting of the duct type induction net piece is cut in a single-side upward mode until the tail end of the duct type induction net piece is connected with the back joint of the front end of the tenth section of the body net to form a closed state;

the back part netting of the duct type induction net piece and the abdomen part netting of the duct type induction net piece are symmetrically cut and contracted in two sides, so that the middle part of the netting of the duct type induction net piece is kept with one third of the mesh number, and the middle part of the netting of the duct type induction net piece and the side part netting of the duct type induction net piece are sewn and fixed to form a contraction type duct which is inclined upwards;

the contraction type conduit forms a guide opening with the height of about 0.4m at the back of the net device and is directly connected with the outer net at the back to form a closed channel.

The utility model discloses according to the individual size and the swimming action of release object, through installation induction device, select the release to different objects of catching concurrently, effectively reduced in the euphausia superba trawl operation problem of catching concurrently such as mammal and fish, ensured the ecological friendly of euphausia superba fishery, promoted the sustainable development of euphausia superba fishery.

Preferably, the cover net and the side net are both provided with two sections, and each section is eight meters long.

Preferably, each section of the body net is eight meters long, the mesh size of the conduit type induction mesh sheet is 0.1 meter, and the conduit type induction mesh sheet is made of 45 strands of polyethylene materials.

Preferably, the length of the back mesh of the catheter-type induction mesh is smaller than the length of the abdomen mesh of the catheter-type induction mesh, and the difference is 0.4 m.

Preferably, the end of the contracted conduit is a window with a height mesh number of 2 meshes x 0.2m and a width mesh number of 50 meshes x 0.2 m.

Preferably, the mesh size of the back outer netting is 0.2 m.

So that the fishes which are caught can directly pass through the outer net mesh from the guide port and return to the sea to finish the release.

Drawings

FIG. 1 is a schematic view of the working state of a boom trawl of Antarctic krill;

FIG. 2 is a development of the netting;

FIG. 3 is a schematic structural view of a catheter-based selection device;

FIG. 4 is a schematic view of the catheter-based selection device in another orientation;

fig. 5 is a schematic view of the catheter-based selection device in another orientation.

The reference numerals and components referred to in the drawings are as follows:

1 is a truss; 2 is a head line; 3 is a lower border line; 4 is a sideline; 5 is a cover net; 6 is a lateral wing net; 7 is a body net; 8 is a catheter type selection device structure; 9 is a back net; 10 is a side net; 11 is a belly net; 12 is back netting; 13 is a guide port; 14 is a rear side netting; 15 is abdominal netting.

Detailed Description

The invention will be further described with reference to the following examples and with reference to the accompanying drawings.

Example 1

Referring to fig. 1-5, the present invention provides a contraction duct-shaped selective device for a euphausia superba trawl, including a euphausia superba trawl, where the euphausia superba trawl includes a truss 1, an upper headrope 2, a lower headrope 3, a siderope 4, a cover net 5, a side wing net 6 and a body net 7, the body net 7 includes a back net 9, a side net 10 and a belly net 11, the body net is provided with ten sections, the ninth section of the body net adopts a duct-type selection device structure 8, the front end of the ninth section of the body net is provided with a duct-type induction net sheet, and the front end length of the duct-type selection device structure is consistent with the tensioning length of the front end of the net at the ninth section of the body net;

the netting 14 at the back side part of the duct type induction net sheet is cut in a single side shape upwards until the tail end of the duct type induction net sheet is connected with the back joint part at the front end of the tenth section of the body net to form a closed state;

the back part netting 12 of the duct type induction net piece and the abdomen part netting 15 of the duct type induction net piece are symmetrically cut and contracted in two sides, the middle part of the netting of the duct type induction net piece is kept with one third of the mesh number, and the middle part of the netting of the duct type induction net piece and the side part netting of the duct type induction net piece are sewn and fixed to form an obliquely upward contraction type duct.

The utility model discloses according to the individual size and the swimming action of release object, through installing interception and induction system respectively, carry out the second grade to different objects of catching concurrently and select the release, effectively reduced mammals and fish etc. and catch the problem concurrently in the euphausia superba trawl operation, ensured the ecological friendly of euphausia superba fishery, promoted the sustainable development of euphausia superba fishery.

Preferably, each section of the body net is eight meters long, the mesh size of the conduit type induction net sheet is 0.1 meter, and the conduit type induction net sheet is made of 45 strands of polyethylene materials.

Preferably, the length of the back net of the catheter-type induction mesh is smaller than the length of the abdomen net of the catheter-type induction mesh, and the difference is 0.4 m.

Preferably, the cutting slope of the side net of the catheter type induction net sheet is 1-2, and the cutting slope of the back net of the catheter type induction net sheet and the cutting slope of the abdomen net of the catheter type induction net sheet are both 2-1, so that the net meshes of the catheter type induction net sheet are kept to be 50 meshes.

Preferably, the end of the constricting conduit is a window with a height mesh count of 2 x 0.2m and a width mesh count of 50 x 0.2 m.

Preferably, the collapsible duct forms a lead-out 13 at the back of the net with a height of about 0.4m and is directly connected with the back outer net with a mesh size of 0.2m to form a closed channel.

The above is only a preferred embodiment of the present invention, and it should be noted that, for those skilled in the art, a plurality of improvements and additions can be made without departing from the principle of the present invention, and these improvements and additions should also be regarded as the protection scope of the present invention.

Claims

1. A contraction type duct-shaped selective device for a euphausia superba trawl comprises the euphausia superba trawl, wherein the euphausia superba trawl comprises a truss rod, an upper border line, a lower border line, a lateral line, a cover net, a lateral net and a body net, and is characterized in that the body net is provided with ten sections, the ninth section of the body net adopts a duct-shaped selective device structure, the front end of the ninth section of the body net is provided with a duct-shaped induction net sheet, and the length of the front end of the duct-shaped selective device structure is consistent with the tensioning length of a clothing net mesh at the front end of the ninth section of the body net;

2. The device of claim 1, wherein the device comprises a plurality of the following components: the cover net and the side wing net are both provided with two sections, and each section is eight meters long.

3. The device of claim 1, wherein the device comprises a plurality of the following components: each section of the net is eight meters long, the mesh size of the conduit type induction net piece is 0.1 meter, and the conduit type induction net piece is made of 45 strands of polyethylene materials.

4. The device of claim 1, wherein the device comprises a plurality of the following components: the mesh size of the back outer netting is 0.2 m.

5. The device of claim 1, wherein the device comprises a plurality of the following components: the length of the back net of the catheter type induction mesh sheet is smaller than that of the abdomen net of the catheter type induction mesh sheet, and the difference value is 0.4 m.

6. The device of claim 1, wherein the device comprises a plurality of the following components: the tail end of the contraction type conduit is a window with the height mesh number of 2 meshes multiplied by 0.2m and the width mesh number of 50 meshes multiplied by 0.2 m.