CN103988816A

CN103988816A - Antarctic krill trawl fishing net

Info

Publication number: CN103988816A
Application number: CN201410200253.3A
Authority: CN
Inventors: 黄洪亮; 陈雪忠; 李灵智; 刘健; 钱友林; 陈勇; 吴昔磊; 吴越
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: 2014-05-13
Filing date: 2014-05-13
Publication date: 2014-08-20
Anticipated expiration: 2034-05-13
Also published as: CN103988816B

Abstract

An Antarctic krill trawl fishing net is composed of an upper rope, a lower rope, a side rope, a strength rope, a wing, a net body and a fish bag. The Antarctic krill trawl fishing net is characterized in that the wing and the net body are single-deck nettings of a four-piece type symmetrical structure, the mesh of the wing is 0.24 meter, and the tension height of the wing is 24 meters; the net body is composed of a back net, a belly net and four-piece symmetrical eight-section polyethylene nettings of two side nets, and the mesh sizes of all sections of nettings are 0.16 meter, 0.12 meter, 0.10 meter, 0.08 meter, 0.08 meter, 0.08 meter, 0.04 meter and 0.02 meter from the net opening downwards sequentially; the netting tension circumference of the net opening is 256 meters, and the tension height of the net body is 79 meters; the netting of the net body shrinks in a trapezoidal shape; the middle 70-mesh positions of the back net, the belly net and the two side nets of the front end of the net body are provided with middle ropes of the upper rope, the side rope and the lower rope respectively, the length of the middle ropes is 5.6 meters, and the total length of the upper rope, the side rope and the lower rope is 56.6 meters; 5-8-mesh nettings on all sides of the back net, the belly net and the two side net nettings are used for net piece sewing.

Description

A kind of krill trawlnet netting gear

Technical field

The present invention relates to the Trawl gear in marine fishing technology, especially fish for the trawlnet netting gear of krill.

Background technology

Krill stock number is abundant, is ring marine site, the South Pole and distributes, and resource reserves reach hundred million tons of 6.5-10, are one of key species in the marine ecosystems of the South Pole.Since the eighties in 20th century krill resource commercial development, mainly take trawl fishing operating type as main.Due to special geographical position, krill fishing ground and operating environment, krill trawlnet all be take single boat trawl as main.Therefore, trawlnet netting gear and web plate are the main tool of krill fishing operation, and wherein trawlnet netting gear is that krill is fished for the most direct tool of production.

The structure of krill trawlnet netting gear, scale need to use ship main engine power size, fish for object biological property, perch Proper Match and the selections such as water layer, swimming feature, marine environment and ship machinery.Krill trawlnet netting gear mainly contains two large types at present, and a kind of is large mesh big net port fourdrinier wire body, and another kind adopts the short body of the little network interface of little mesh.Netting gear structure mainly contains four-piece type, six chips and eight slice structures, and body rear portion all adopts double-deck etting, and wherein outside etting size of mesh is larger, to guarantee the bulk strength of netting gear; And internal layer is mainly comprised of the etting of less size of mesh, to prevent the thorn extension of krill in the process of fishing for or to escape.

The large specification krill of large mesh trawlnet netting gear main manifestations is that fishing gear network interface size of mesh and network interface tension girth are all larger, maximum mesh is of a size of 16-20 rice, and network interface tension girth can reach 800-1200 rice, for keeping the net type of netting gear smooth and easy, general netting gear length is longer, at 250-350 rice.Such netting gear be take four-piece type structure as main, in actual use procedure, for keeping effective expansion of big net port, the rete cord configurations such as its manrope, fork guiding principle are also corresponding longer, therefore, in operation process, need the longer time of cost to rise and put net operation, be unfavorable for improving catching rate.

The little network interface krill of little mesh trawlnet, main manifestations is that mesh part size of mesh is less, is generally 0.15-0.24 rice, network interface tension Zhou Changyue 180-200 rice, netting gear structure generally adopts six chips or eight slice structures, by cutting out contraction, shortens body length.Approximately 100 meters of such netting gear body length.In operation process, due to its netting gear small scale, corresponding rete cord length is shorter, works that to put net spee fast, puts net and on the time, has obvious operation advantage rising, and catching rate is relatively high.But because such netting gear generally adopts double-deck etting structure, netting gear assembly technology is complicated, and net resistance is large, in netting gear cleaning and mending course, seem more loaded down with trivial details.Once such netting gear occurs damaged, brings a lot of troubles to repairing, affects normal fishing.

Summary of the invention

For solving the deficiency that in prior art, krill trawlnet netting gear exists, the present invention proposes a kind of krill trawlnet netting gear, meets the job requirements that krill is efficiently fished for.

Technical scheme of the present invention is comprised of exaggerated, infraclass, side guiding principle, manrope, wing, body net and keed, and keed is sewn to body net end, it is characterized in that wing and body net are individual layer etting, four-piece type symmetrical structure; Wing etting size of mesh is 0.24 meter, and wing outside adopts 6-1 taper ratio, and network interface inner side adopts 1-1 to cut out, and adds in network interface both sides the jibs that 20 order taper ratios are 1-2, and wing tension is highly 24 meters; Wing is that 2/3 order is sewed up with connecting of body net; Body net forms by carrying on the back the symmetrical 8 sections of polyethylene ettings stitching of net, belly and two avris net four-piece types, and each section of etting size of mesh is down 0.16 meter, 0.12 meter, 0.10 meter, 0.08 meter, 0.08 meter, 0.08 meter, 0.04 meter and 0.02 meter successively from network interface; Body net front end network interface part etting tension girth is 256 meters, and the etting tension girth of the nearly network interface end of latter end is 24 meters, and whole body net tension is highly 79 meters; Body net etting is trapezoidal shape and shrinks, and each section of cutting slope is down 2-1,2-1,2-1,3-1,3-1,4-1,4-1 and 4-1 from network interface successively; Body net front end is guiding principle in the middle part 70 order fit ons, side, infraclass of back of the body net, belly and two avris nets respectively, and joining guiding principle hanging ratio is 0.5, and middle guiding principle length is 5.6 meters, and upper, side, lower rete cord total length are 56.6 meters; Back of the body net, belly and two avris net ettings are in assembling process, and each 5-8 order etting of every side is sewed up for net sheet.

Outstanding feature of the present invention is that back of the body net, belly and four, the side net of netting gear is individual layer etting, symmetrical structure, desalinated the structure position difference of netting gear each several part, be convenient in use according to the wearing and tearing of netting gear, the installation site of the rete cords such as netting gear is exaggerated by changing, infraclass and side guiding principle, can conveniently side net be changed into back of the body net and belly, adjust the structure function of each portion of netting gear, keep etting uniform wear, improve the service life of netting gear.Wing partly adopts 1-1 hypotenuse to cut out, and coordinates the excessive structure of 2 jibs, has simplified the netting gear processing technology of wing part, the even transmission that can effectively keep network interface part stress, the vertical opening and the horizontal expansion that are conducive to improve trawlnet netting gear network interface.Four position front ends of wing are jag not, optimized the bifurcation structure between the adjacent wing front ends such as traditional the trawlnet netting gear back of the body net, side net and belly, the fork guiding principle that can reduce in netting gear use connects, make, on the stressed joining edge being directly passed between adjacent net pieces of netting gear and in the manrope of netting gear, to be conducive to increase the abundant expansion of netting gear intensity and etting.Body mesh portions has broken through traditional material and the design feature of krill trawlnet etting nylon material, double-deck etting, adopt high-strength polyethylene etting material and individual layer etting structure, there is the obstruction that traditional netting gear is identical and the function of inducing krill to enter net capsule.In netting gear back, sidepiece and belly four part body etting assembling processes, each sews up every side 5-8 order etting for net sheet, for strengthening the intensity of joining edge, can in working to put network process, play netting gear auxiliary bar guiding principle simultaneously.The present invention has the netting gear of simplification processing technology, has saved labor cost, has improved processing and fabricating efficiency, change trawlnet netting gear etting structure, reduced netting gear material, improved netting gear water filtering performance, reduced net resistance, optimized net netting gear structure, shortened the net operation process of putting, improved the remarkable result of the service efficiency of netting gear, can make krill fish for the average hauling activity duration and within required 50 minutes, foreshorten to 30 minutes by original large mesh krill trawlnet, putting the net time foreshortened to 20 minutes by 30 minutes, whole hauling, putting the required time of network process is equivalent in the past rising the required time of network process of large mesh krill trawlnet, the krill trawling that reaches 10-12 time for average daily work network requires, can obviously improve trawling efficiency, increase a day trawl fishing net sub-quantity, increase fishery output.

Accompanying drawing explanation

Fig. 1 is krill trawlnet structural representation;

Fig. 2 is the krill trawlnet back of the body (abdomen) net etting expanded view;

Fig. 3 is krill trawlnet side net etting expanded view;

Fig. 4 is network interface triangulation network assembling schematic diagram;

Embodiment

Below in conjunction with accompanying drawing, embodiment is described:

Krill trawlnet netting gear is comprised of exaggerated 1, side guiding principle 2, infraclass 3, manrope 4, wing 5, body net 6 and keed 7, and keed is sewn to body net end, and wing and body net are polythene material individual layer etting, four-piece type symmetrical structure; Wing etting size of mesh is 0.24 meter, and network interface inner side adopts 1-1 cut outand in network interface both sides, add the triangulation network 8 that 20 order taper ratios are 1-2, wing is that 2/3 order blind stitching is sewed up with connecting of body net etting, body net front center 70 orders are respectively used to the middle guiding principle of fit on, side, infraclass, joining guiding principle hanging ratio is 0.5, middle guiding principle length is 5.6 meters, and upper, side, lower rete cord total length are 56.6 meters; Wing outside adopts 6-1 taper ratio, and wing tension is highly 24 meters; Body net is comprised of eight sections of joinings, and each section of etting size of mesh is down 0.16 meter, 0.12 meter, 0.10 meter, 0.08 meter, 0.08 meter, 0.08 meter, 0.04 meter and 0.02 meter successively from network interface; Body net etting is trapezoidal shape and shrinks, from network interface part to net capsule anterior etting be totally first fast slow contraction situation, its shrinkage degree speed is controlled by the taper ratio of each section of etting, and each section of cutting slope is down 2-1,2-1,2-1,3-1,3-1,4-1,4-1 and 4-1 from network interface successively; Netting gear back, sidepiece and belly four part body net ettings are in netting gear assembling process, and each reserved 5-8 order etting of every side is sewed up for net sheet, and connect with manrope the intensity of strengthening joining edge; Body net front end network interface part etting tension girth is 256 meters, and the etting tension girth of the nearly network interface end of latter end is 24 meters, and whole body net tension is highly 79 meters.

Claims

1. a krill trawlnet netting gear, is comprised of exaggerated, infraclass, side guiding principle, manrope, wing, body net and keed, and keed is sewn to body net end, it is characterized in that wing and body net are individual layer etting, four-piece type symmetrical structure; Wing etting size of mesh is 0.24 meter, and wing outside adopts 6-1 taper ratio, and network interface inner side adopts 1-1 to cut out, and adds in network interface both sides the jibs that 20 order taper ratios are 1-2, and wing tension is highly 24 meters; Wing is that 2/3 order is sewed up with connecting of body net; Body net forms by carrying on the back the symmetrical 8 sections of polyethylene ettings stitching of net, belly and two avris net four-piece types, and each section of etting size of mesh is down 0.16 meter, 0.12 meter, 0.10 meter, 0.08 meter, 0.08 meter, 0.08 meter, 0.04 meter and 0.02 meter successively from network interface; Body net front end network interface part etting tension girth is 256 meters, and the etting tension girth of the nearly network interface end of latter end is 24 meters, and whole body net tension is highly 79 meters; Body net etting is trapezoidal shape and shrinks, and each section of cutting slope is down 2-1,2-1,2-1,3-1,3-1,4-1,4-1 and 4-1 from network interface successively; Body net front end is guiding principle in the middle part 70 order fit ons, side, infraclass of back of the body net, belly and two avris nets respectively, and joining guiding principle hanging ratio is 0.5, and middle guiding principle length is 5.6 meters, and upper, side, lower rete cord total length are 56.6 meters; Back of the body net, belly and two avris net ettings are in assembling process, and each 5-8 order etting of every side is sewed up for net sheet.