CN104938440A - Biserial type multi-window combined trachurus murphyi trawl selectivity test device - Google Patents
Biserial type multi-window combined trachurus murphyi trawl selectivity test device Download PDFInfo
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- CN104938440A CN104938440A CN201510292251.6A CN201510292251A CN104938440A CN 104938440 A CN104938440 A CN 104938440A CN 201510292251 A CN201510292251 A CN 201510292251A CN 104938440 A CN104938440 A CN 104938440A
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- test
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- A—HUMAN NECESSITIES
- A01—AGRICULTURE; FORESTRY; ANIMAL HUSBANDRY; HUNTING; TRAPPING; FISHING
- A01K—ANIMAL HUSBANDRY; CARE OF BIRDS, FISHES, INSECTS; FISHING; REARING OR BREEDING ANIMALS, NOT OTHERWISE PROVIDED FOR; NEW BREEDS OF ANIMALS
- A01K73/00—Drawn nets
- A01K73/02—Trawling nets
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Abstract
The invention discloses a biserial type multi-window combined trachurus murphyi trawl selective test device, and relates to a trachurus murphyi trawl selectivity device. A trachurus murphyi trawl fish bag is adopted, lacing lines, fish bag waist hoops and flexible fixing rings are installed on the trachurus murphyi trawl fish bag. The biserial type multi-window combined trachurus murphyi trawl selective test device is characterized in that two rows of test windows are formed in the middle of the portion, one third of the front portion of the trachurus murphyi trawl fish bag, of a back mesh in parallel, each row of the test windows comprises four test windows, the width of each test window is 0.75 m, the height of each test window is 2 m, the transverse adjacent distance of every two windows is 0.5 m, the front and back adjacent distance of every two windows is 1 m, and size fixation is conducted on the test windows through positioning cables; according to selectivity test demands, selectivity test meshes with four kinds of mesh sizes and separation grids with four kinds of different spacing lattices are installed in each test window; a nylon material mesh bag which is provided with a 50 mm mesh size and matched with the size of the corresponding test window is installed in the test window and used for collecting species and the number of fishes which escape through meshes and providing a basis for mesh size selectivity research.
Description
Technical field
The present invention relates to jack mackerel dragging span device.
Background technology
Since ancient times, abundant aquatic resources is considered to the inexhaustible present that the Nature is granted.But along with the growth of fishery knowledge and the strong development of fishery, people start to recognize, although aquatic resources is reproducible, are not unlimited; According to the assessment of FAO to global fishery resources, global fishery resources 53% are developed completely, the space of not exploitation further; 28% is excessively developed, and 4% in decay state, needs by implementing recovery plan; Only 15% is low or moderate solution, tool potentiality to be exploited.For making aquatic resources, the nutrition of ever-increasing world population, economic and society benefit are made contributions enduringly; nineteen ninety-five Committee on Fisheries of FAO (Food and Agriculture Organization of the United Nation) pass through be intended to carry out responsible fisheries and the directive document " responsible the Rules of Conduct " formulated; file proposes further practical to develop and application has selectivity, environmentally sound fishing gear and fishing method to responsible fishing for especially; to keep bio-diversity, protection population structure, aquatic ecosystem are unified the quality of fish.Fish in process should cut the waste as far as possible, the quantity of the catch of non-targeted fish and non-fish species and on the impact of being related with it or on the species that it relies on.
Under this basis, release separator and the research of keed size of mesh selectivity have been carried out around responsible Fishing technology in countries in the world.General application cover net test method(s) in actual tests process, net the com-parison and analysis of interior fishery harvesting by the keed of different size of mesh and cover, study different size of mesh to the Selection effect of mainly fishing for kind, provide foundation for selecting the ecological friendly suitable keed size of mesh of tool and working out size of mesh administrative standard.In release separator use, be installed on netting gear inside due to more, so be mainly used in release guard macro-organism, as green turtle, sea lion, sea dog etc., not obvious to little individual biological releasing effect.Traditionally for making Choice tests effect have scientific value, more than 3 kinds different structures or size generally need be selected to carry out test and could obtain reliable result of the test.And each Choice tests structure or size all need to carry out separately repeatedly repeated test, the reliability of result of the test could be determined.After completing a kind of test, need on-the-spot exchange experimental rig, not only labour intensity is large, and affects normal production and test, and result of the test is also subject to the impact such as sea situation environment and living resources distribution, is unfavorable for carrying out investigation on a large scale.
Summary of the invention
The object of the invention is, by Dui jack mackerel trawlnet keed part, 8 kinds of Choice tests windows are installed respectively, ensureing under fishery science research and the compatible prerequisite of normal fish production, realize fishing for the synchronous acquisition of kind to different choice experimental rig release juvenile fish and non-targeted in the process of fishing for, and by analysis and research, obtain the suitableeest keed size of mesh based on ecological safety or releasing device structure, reach ecological, responsible and fish for object, for the sustainable use of fishery resources provides technical guarantee.
Technical scheme of the present invention adopts jack mackerel trawlnet keed jack mackerel trawlnet keed that manrope, keed waist hoop and flexible retainer ring are housed, it is characterized in that double test window is offered at anterior 1/3 back of the body net position placed in the middle of jack mackerel trawlnet keed side by side, often row's test each 4 of window, each test window width is 0.75m, is highly 2m, and window laterally adjacent spacing is 0.5m, the adjacent spacing in front and back is 1m, and test window registration wire carries out size to be fixed; According to Choice tests needs, at test window, 4 kinds of size of mesh Choice tests mesh sheet grid distance grilles different from 4 kinds can be installed; Or the Choice tests mesh sheet of 8 kinds of different grid distance grilles or 8 kinds of different size of meshes is installed; At Choice tests window position, installing size of mesh is respectively 50mm, the nylon material mesh bag matched with test window size, for collecting fishery harvesting kind and the quantity of being selected escape by mesh, for size of mesh Selecting research provides foundation.
Feature of the present invention, comprehensive large-scale jack mackerel trawlnet netting gear fishing gear specification is large, the maximum mesh of network interface is more than 20m, the maximum tension girth of girth can reach 1400-1600m, netting gear total length is about 500m, keed length is close to 50m, fishery harvesting output per net reaches the gear structures such as 50-100t and operating feature, in conjunction with catches network access process and flight behavior in fishery harvesting process, by installing 8 kinds of Choice tests windows respectively in trawlnet keed part, ensureing under fishery science research and the compatible prerequisite of normal fish production, realize fishing for the synchronous acquisition of kind to different choice experimental rig release juvenile fish and non-targeted in the process of fishing for, and by analysis and research, obtain the suitableeest keed size of mesh based on ecological safety or releasing device structure, reach ecological, take responsibility and fish for object, for the sustainable use of fishery resources provides technical guarantee.The present invention can realize the simultaneous test of different size, structure selectivity device, effectively can save standard selective try net sub-quantity 7/8, the present invention only completes test mission with 1/8 time of conventional method, a large amount of test periods can be saved, improve Choice tests efficiency, the present invention can avoid the sampling difference because the resource fluctuations such as output per net and catch structure reason produces, and realizes synchronism and the uniformity of result of the test, improves comparativity and accuracy; The present invention utilizes jack mackerel trawlnet keed design feature, select anterior 1/3 position of keed, be positioned at and fish for the main region that fishery harvesting enters escape activity before trawlnet keed, be conducive to the collection of Choice tests data and analyze judgement, device installation position is only born and is guided fishery harvesting object to enter effect bottom keed in harvesting process, does not bear storage and the harvesting of catches.Therefore, test window can not produce because working the catches squeeze-out phenomenon of fishing for generation, causes the distortion of result of the test, is conducive to the reliability of result of the test.
Accompanying drawing explanation
What Fig. 1 represented is double-row type multiwindow combined jack mackerel dragging span experimental rig schematic diagram.
What Fig. 2 represented is that double-row type multiwindow combined jack mackerel dragging span experimental rig launches schematic diagram.
Embodiment
It is mounting platform that double-row type multiwindow combined jack mackerel dragging span experimental rig (see accompanying drawing) forms Yi jack mackerel trawlnet keed by scad trawlnet keed 1, test window 2, window position rope 3, its etting size of mesh 100mm, by diameter be 10mm woven polyethylene line weave form, T-meshes is 280 orders, and N-meshes is 480 orders; Scad trawlnet keed is equipped with manrope 4, keed waist hoop (horizontal manrope) 5 and flexible retainer ring 6; Before scad trawlnet keed etting, 1/3 back of the body position, net center line both sides arranges 4 width is respectively 0.75m, it is highly the test window of 2m, test window laterally adjacent spacing is 0.5m, and the adjacent spacing in front and back is 1m, carries out vertical and horizontal location with the window position rope of diameter 16mm; Two row test windows can be installed size of mesh respectively and be respectively the grille that the Choice tests mesh sheet of 4 kinds of specifications of 90mm, 100mm, 110mm and 120mm and grid distance are respectively 2.5,3,3.5 and 4mm; The Choice tests mesh sheet of 4 kinds of specifications of size of mesh 90mm, 100mm, 110mm and 120mm, width mesh/height order number is respectively: 21/24,19/22,17/20 and 16/18 order; Grille is spacing to 2.5,3,3.5 and 4mm spacing respectively by the nylon rope of diameter 16mm, and between adjacent window apertures, interval mesh sheet uses keed identical with reality.On test window top, installing size of mesh is respectively the mesh bag of 50mm, for collecting the fishery harvesting kind and quantity that to be discharged by experimental rig or escape, for the parameter study of optimal selection device provides foundation.
Scad trawlnet keed etting adjacent shear cutting edge longitudinally order parallel blind stitching from top to bottom, each cutting edge respectively need provide 3 orders to sew up for joining edge, plays the object strengthening joining edge intensity; Along joining edge toward its both sides at interval of 70 orders respectively by the proportioning device keed manrope 4 of joining guiding principle hanging ratio 0.95, keed manrope is diameter 42mm enlightening Nima (the strong PE of superelevation) rope, the rope sling that every root pocket net manrope two ends stay 1 300mm long, is connected for closing up to restrict with scad trawlnet etting net muscle and keed.At the keed rear portion that catches are the most concentrated, install keed waist hoop 5 (horizontal manrope) respectively, for preventing keed extruding explosion in fishery harvesting lifting process, keed waist hoop material is diameter 42mm polypropylene 8 strand, the long 10m of per pass keed waist hoop, per pass keed waist hoop spacing is 1.2m; After between keed waist hoop and keed, home position is determined; waist hoop is positioned over etting outside; with diameter 10mm enlightening Nima rope at the outside flexible retainer ring 6 becoming 50mm wide with front and back keed braiding of waist hoop; keed waist hoop is limited in keed corresponding site; use it both can avoid contacting with the hard of keed etting in a network process, protection etting can be played again and extrude stressed effect by catches.
Claims (5)
1. double-row type multiwindow combined jack mackerel dragging span experimental rig, adopt jack mackerel trawlnet keed jack mackerel trawlnet keed that manrope, keed waist hoop and flexible retainer ring are housed, it is characterized in that double test window is offered, often row's test each 4 of window side by side in anterior 1/3 back of the body net position placed in the middle of jack mackerel trawlnet keed, each test window width is 0.75m, be highly 2m, window laterally adjacent spacing is 0.5m, and the adjacent spacing in front and back is 1m, and test window registration wire carries out size to be fixed; According to Choice tests needs, at test window, 4 kinds of size of mesh Choice tests mesh sheet grid distance grilles different from 4 kinds are installed; At Choice tests window position, installing size of mesh is respectively 50mm, the nylon material mesh bag matched with test window size.
2. double-row type multiwindow according to claim 1 combined jack mackerel dragging span experimental rig, it is characterized in that jack mackerel trawlnet keed etting size of mesh 100mm, by diameter be 10mm woven polyethylene line weave form, T-meshes is 280 orders, and N-meshes is 480 orders.
3. double-row type multiwindow according to claim 1 combined jack mackerel dragging span experimental rig, it is characterized in that the 4 kinds of Choice tests mesh sheet size of meshes testing window installation are respectively 90mm, 100mm, 110mm and 120mm, width mesh/height order number is respectively: 21/24,19/22,17/20 and 16/18 order; 4 kinds of grille grid distances are respectively 2.5,3,3.5 and 4mm spacing.
4. double-row type multiwindow combined jack mackerel dragging span experimental rig, adopt jack mackerel trawlnet keed jack mackerel trawlnet keed that manrope, keed waist hoop and flexible retainer ring are housed, it is characterized in that double test window is offered, often row's test each 4 of window side by side in anterior 1/3 back of the body net position placed in the middle of jack mackerel trawlnet keed, each test window width is 0.75m, be highly 2m, window laterally adjacent spacing is 0.5m, and the adjacent spacing in front and back is 1m, and test window registration wire carries out size to be fixed; According to Choice tests needs, at test window, the different grid distance grille of installation 8 kinds can be installed; At Choice tests window position, installing size of mesh is respectively 50mm, the nylon material mesh bag matched with test window size.
5. double-row type multiwindow combined jack mackerel dragging span experimental rig, adopt jack mackerel trawlnet keed jack mackerel trawlnet keed that manrope, keed waist hoop and flexible retainer ring are housed, it is characterized in that double test window is offered, often row's test each 4 of window side by side in anterior 1/3 back of the body net position placed in the middle of jack mackerel trawlnet keed, each test window width is 0.75m, be highly 2m, window laterally adjacent spacing is 0.5m, and the adjacent spacing in front and back is 1m, and test window registration wire carries out size to be fixed; According to Choice tests needs, the Choice tests mesh sheet of 8 kinds of different size of meshes is installed at test window; At Choice tests window position, installing size of mesh is respectively 50mm, the nylon material mesh bag matched with test window size.
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| Application Number | Priority Date | Filing Date | Title |
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| CN201510292251.6A CN104938440A (en) | 2015-06-01 | 2015-06-01 | Biserial type multi-window combined trachurus murphyi trawl selectivity test device |
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| CN201510292251.6A CN104938440A (en) | 2015-06-01 | 2015-06-01 | Biserial type multi-window combined trachurus murphyi trawl selectivity test device |
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Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106818656A (en) * | 2017-02-21 | 2017-06-13 | 山东好运通网具科技股份有限公司 | A kind of big-holed net of convenient working and its hauling method of operation on the sea |
| CN108445153A (en) * | 2018-02-27 | 2018-08-24 | 中国水产科学研究院南海水产研究所 | A kind of Cod-ends of Trawl Choice tests device |
| CN111642469A (en) * | 2020-06-04 | 2020-09-11 | 中国水产科学研究院东海水产研究所 | Bag-shaped net and method for acquiring escape rate of caught object from trawl mesh by using same |
Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO1998025452A1 (en) * | 1996-12-09 | 1998-06-18 | Nordurnet Hf | Device for sorting out marine species in fishing trawl |
| CN201830776U (en) * | 2010-09-02 | 2011-05-18 | 中国水产科学研究院南海水产研究所 | Fishing stow net sack |
-
2015
- 2015-06-01 CN CN201510292251.6A patent/CN104938440A/en active Pending
Patent Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO1998025452A1 (en) * | 1996-12-09 | 1998-06-18 | Nordurnet Hf | Device for sorting out marine species in fishing trawl |
| CN201830776U (en) * | 2010-09-02 | 2011-05-18 | 中国水产科学研究院南海水产研究所 | Fishing stow net sack |
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106818656A (en) * | 2017-02-21 | 2017-06-13 | 山东好运通网具科技股份有限公司 | A kind of big-holed net of convenient working and its hauling method of operation on the sea |
| CN108445153A (en) * | 2018-02-27 | 2018-08-24 | 中国水产科学研究院南海水产研究所 | A kind of Cod-ends of Trawl Choice tests device |
| CN111642469A (en) * | 2020-06-04 | 2020-09-11 | 中国水产科学研究院东海水产研究所 | Bag-shaped net and method for acquiring escape rate of caught object from trawl mesh by using same |
| CN111642469B (en) * | 2020-06-04 | 2022-08-19 | 中国水产科学研究院东海水产研究所 | Bag-shaped net and method for acquiring escape rate of caught object from trawl mesh by using same |
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Application publication date: 20150930 |