CN203523584U - Drag net with multiple sets of parallel bags - Google Patents

Drag net with multiple sets of parallel bags Download PDF

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Publication number
CN203523584U
CN203523584U CN201320558344.5U CN201320558344U CN203523584U CN 203523584 U CN203523584 U CN 203523584U CN 201320558344 U CN201320558344 U CN 201320558344U CN 203523584 U CN203523584 U CN 203523584U
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China
Prior art keywords
pouch
pouches
framework
net
parallel
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Expired - Lifetime
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CN201320558344.5U
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Chinese (zh)
Inventor
宋伟华
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Zhejiang Ocean University ZJOU
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Zhejiang Ocean University ZJOU
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Abstract

The utility model discloses a drag net with multiple sets of parallel bags. The drag net comprises a net wing, a net body and a net bag. The net bag comprises a frame and the multiple bags which are stacked on the frame in parallel. A bag mouth opening and closing device, a bag detaching device and a controller are arranged on the frame. The net bag which is formed by stacking the multiple bags in parallel is used in the drag net, catches caught through the drag net can be collected into the corresponding bags in batches and can be detached from the net body in time and dragged and lifted to a fishing ship along with the bags, the problems that the caught catches in the net bag are extruded, scratched or dead and even go bad due to long time net dragging are solved, the survival rate and fresh quality of the catches are improved, the catches are fetched in batches, the bags are light, and therefore power of a winch of the fishing ship is correspondingly reduced.

Description

Trawlnet with parallel many group pouches
Technical field
The utility model relates to a kind of Fishing tool, refers more particularly to a kind of trawlnet with parallel many group pouches that improves catches survival rate and fresh and alive degree.
Background technology
Trawlnet is a kind of filter fishing gear of movement, relies on fishing boat power towing pouch shape fishing gear, forces fish, shrimp, crab etc. to fish for object enter in net capsule in the waters of its process, reaches the object of fishing.
Just due to trawling maneuverability, strong adaptability, production efficiency is high, has development speed history and feature faster.Modern Trawl gear not only can be used for fishing for fish, also can be used for fishing for siphonopods, shellfish and shell-fish; Not only can be used for fishing for and perch the depth of water and only have the object of fishing for of several meters, tens meters, also can perch the depth of water and reach the deep-sea kind of thousands of meters for fishing for.This high efficiency fishing for to marine fishery resources caused immense pressure, more fishery harvesting resource falls into recession, and each drag operation time is multiplied, and is out of shape drainability poor during the operation of net capsule, caused the catches extruding, scratch, the death that enter in net, even rotten.For this reason, both at home and abroad by a large amount of technological improvements, use from square mesh, towing method improvement, the adjustment of towing time etc. improves fishery harvesting quality, if Granted publication number is CN2657393Y, name is called a kind of utility model patent of net sack of fishing trawl, disclose a kind of fishing trawl structure, the net capsule structure that adopts square mesh and diamond mesh to combine, improved fishing selectivity, but owing to fundamentally not reforming gear structure and catches collecting mode, in trawlnet towing process for a long time, catches are in a large amount of gatherings of net capsule, pile up, survival rate and the fresh and alive degree of catches are not still improved, product quality is still lower.
Utility model content
When the utility model mainly solves existing trawling, net capsule is subject to catches to pile up poor catches extruding, scratch, dead, the even rotten technical problem of causing of yielding and drainability; Provide a kind of and can control net capsule extraction time, improved the trawlnets with parallel many group pouches of catches survival rate and fresh and alive degree.
In order to solve the technical problem of above-mentioned existence, the utility model is mainly to adopt following technical proposals:
Trawlnet with parallel many group pouches of the present utility model, for the operation that drags a net in fishing of fishing boat, described trawlnet comprises wing, body and net capsule, and described wing is provided with the guiding principle that drags being connected with fishing boat, and described net capsule is located at body rear end and is connected with body, and net capsule comprises
Framework, is located at body rear portion, for the connection of pouch and body and expand pouch mouth, is provided with pouch ora switch device, pouch disconnecting means and controller on framework;
Some pouches, for splendid attire catches, a plurality of pouches superimposed being arranged on framework in parallel, pouch mouth is provided with front frame, is equipped with the strand guiding principle being connected with fishing boat in each pouch;
Pouch ora switch device, is located in framework, is used to open or close pouch mouth;
Pouch disconnecting means, is located in framework, controls the disengaging of pouch and body;
Controller, controls the information signal of platform transmission and controls pouch ora switch device and pouch disconnecting means for the fishery harvesting quantity monitoring receiving on fishing boat;
Trawlnet uses by a plurality of pouches superimposed net capsule forming in parallel, making catches that trawlnet is caught can be collected in corresponding pouch in batches and depart from body towing with pouch is promoted on fishing boat, the catches of having caught while having solved because of long-time trawlnet push, abrade or dead even rotten problem in net capsule, improved survival rate and the fresh and alive quality of catches, gradation is extracted and the also corresponding power that alleviates fishing boat winch of lighter pouch.
As preferably, the outer surface of described framework and front frame is all covered with the soft rubber layer that one deck is smooth, soft surface is smooth without corner angle, when catching operation and hauling, can not hook dictyosome and each head rope, safe to use, thicker rubber layer also contributes to absorb the energy clashing into, and prevents the harm that powerful collision produces.
As preferably, described framework is rectangular, comprise interconnective upper and lower moulding and left and right moulding, the medial surface of described left and right moulding is provided with guide groove, described front frame is installed in described guide groove and can slides along guide groove, the front frame parallel connection of a plurality of pouches is stacked and placed on framework, described pouch ora switch device and pouch disconnecting means and controller are all located in the lower moulding of framework, the front frame of the bootable pouch of guide groove slides, pouch mouth can open or close with the need, has met the requirement that a plurality of pouches are collected successively catches and departed from body.
As preferably, described front frame is rectangular, comprise interconnective upper sheer pole and left and right vertical pole, the width of described cross bar length and described framework matches, vertical pole is the Collapsible structure of hollow, the top of vertical pole and cross tube end are affixed, the bottom of vertical pole and sheer pole end are affixed, between the both ends of upper sheer pole, be respectively equipped with flexible member, one end of described flexible member is connected with cross tube end, the other end is connected with sheer pole end, the purse up length of the drift of flexible member and vertical pole matches, telescopic vertical pole can freely open or close the front frame of rectangle, correspondingly drive the opening and closing of pouch mouth.
As preferably, described vertical pole is telescopic caulking gum bellows, described rubber bellows is provided with tracheae, described tracheae is communicated with described controller, gases at high pressure enter rubber bellows by tracheae and bellows top are stretched and overcome the pulling force of flexible member and front frame is opened, when closing gases at high pressure and releasing after gas, rubber bellows resets and bounces back, and before making under the pulling force effect of flexible member, frame is replied and closed simultaneously.
As preferably, described flexible member is located in the hollow cavity of described rubber bellows.
As preferably, in described vertical pole, be provided with telescopic cylinder, described telescopic cylinder is connected with described controller, telescopic cylinder promotes cross tube and moves, and front frame is opened, and gathers when getting and piling with pouch when catches, telescopic cylinder is retracted and is driven cross tube to reply, make front frame closed, by pouch sealing, for the disengaging of net capsule is got ready.
As preferably, described pouch ora switch device comprises high pressure gas holder and the control valve as power source, described control valve is controlled by controller, described high pressure gas holder is communicated with described rubber bellows or telescopic cylinder by control valve, adopt pneumatic control net capsule ora switch device, simple in structure, safe and reliable, and volume source low thrust is large, met in the specific (special) requirements of using compared with abyssal floor.
As preferably, described pouch disconnecting means comprises the keying plate of being located at moulding top, left and right and capping guide groove, described keying plate is controlled by controller, opening and closing the length of plate and the vertical pole length that described front frame is purse up state matches, when opening and closing plate, open, the upper side of guide groove is opened, be installed in the front frame disengaging of the pouch guide groove that guide groove topmost is purse up shape, and drive pouch and framework apart, before pouch after disengaging, purse up is closed due to the effect of flexible member for frame, pouch is now by twisting accordingly guiding principle towing and being reclaimed and carry to deck by fishing boat winch, when opening and closing plate, close, guide groove upper side is sealed again, before making to be installed on all the other pouches in guide groove, frame can not depart from framework, by keying plate to be opened/closed is set on the moulding of framework left and right, before making to be originally connected to the corresponding pouch in guide groove, frame can depart from guide groove under the effect of pouch weight, controller is controlled and is opened and closed plate and then control pouch, the pouch that parallel connection is stacked on framework can depart from body successively on request, reach and reduce gathering and the accumulation time of catches in pouch.
The trawlnet live body catching method of organizing pouch with parallel connection more, its step is as follows:
1) controller is set the separation time of trawl fishing towing time uniform distribution pouch, and the front frame stack parallel connection of a plurality of pouches is installed on framework;
2) trawlnet is put into water, start fishing boat and trawlnet is opened start to pull fishing operation;
3) the front frame opening and closing device of controller opens framework the superiors pouch, make gases at high pressure be filled with rubber bellows or the telescopic cylinder in vertical pole, vertical pole stretches forward and makes sheer pole separately form the pouch mouth of expansion, and now, the catches of being caught by trawlnet are built up to pouch by framework;
4) controller pulls the time or obtains fishery harvesting quantity monitor message signal from fishing boat by the trawl fishing of setting, the separation time that is filled with enough catches or pouch in the pouch of the judgement the superiors arrives, this Time Controller is controlled the opening and closing device of the front frame of the superiors' pouch and is closed the superiors' pouch, front frame returns back to purse up state under the pulling force effect of flexible member, simultaneously, controller is controlled the opening and closing device of the front frame of second pouch and is opened the front frame of second pouch, the pouch mouth expansion of second pouch, similar, the catches of being caught by trawlnet are built up to second pouch by framework,
5) before the pouch of the superiors after the complete purse up closure of frame, controller is controlled pouch disconnecting means and is opened the keying plate on the moulding of framework left and right, now, the front frame that is full of the superiors' pouch of catches departs from framework guide groove, and pouch is separated with body, fishing boat relies on strand guiding principle to tow back to pouch and be promoted to deck with winch, complete the recovery operation of first pouch, meanwhile, fishing boat is readjusted towed speed, guarantee that towing is stable, do not affect fishing operation;
6) the like, all the other pouches can be reclaimed and extract by same mode.
The beneficial effects of the utility model are: trawlnet uses by a plurality of pouches superimposed net capsule forming in parallel, making catches that trawlnet is caught can be collected in corresponding pouch in batches and depart from body towing with pouch is promoted on fishing boat, the catches of having caught while having solved because of long-time trawlnet push, abrade or dead even rotten problem in net capsule, improved survival rate and the fresh and alive quality of catches, gradation is extracted and the also corresponding power that alleviates fishing boat winch of lighter pouch.
Accompanying drawing explanation
Fig. 1 is a kind of structural representation of the present utility model.
Tu2Shi the superiors pouch is opened and the schematic diagram of other pouch closures.
Schematic diagram when Tu3Shi the superiors pouch departs from body and collects.
Fig. 4 is a kind of frame structure schematic diagram in Fig. 1.
Fig. 5 is mount structure schematic diagram before a kind of pouch in Fig. 1.
1. wings in figure, 2. body, 3. net capsule, 31. frameworks, 311. upper frame bars, 312 times mouldings, 313. left mouldings, 314. right mouldings, 315. guide grooves, 316. open and close plates, 32. pouches, 321. front frames, 3211. cross bars, 3212. vertical poles, 322. strand guiding principles.
Embodiment
Below by embodiment, and by reference to the accompanying drawings, the technical solution of the utility model is described in further detail.
Embodiment 1: the trawlnet with parallel many group pouches of the present embodiment 1, for the operation that drags a net in fishing of fishing boat, as shown in Figure 1, trawlnet comprises wing 1, body 2 and net capsule 3, on wing, be connected be connected with fishing boat drag guiding principle 11, net capsule is installed on body rear end and is connected with body, net capsule comprises
Framework 31, is arranged on body rear portion, for the connection of pouch and body and expand pouch mouth, pouch ora switch device, pouch disconnecting means and controller is installed on framework, at the outer surface of framework, is covered with the soft rubber layer that one deck is smooth;
Four pouches 32, for splendid attire catches, pouch superimposed being arranged on framework in parallel, pouch mouth is provided with front frame 321, is equipped with the strand guiding principle 322 being connected with fishing boat in each pouch, and the outer surface of front frame is all covered with the soft rubber layer that one deck is smooth;
Pouch ora switch device, is installed in framework, is used to open or close pouch mouth;
Pouch disconnecting means, is installed in framework, controls the disengaging of pouch and body;
Controller, controls the information signal of platform transmission and controls pouch ora switch device and pouch disconnecting means for the fishery harvesting quantity monitoring on wireless receiving fishing boat;
As shown in Figure 4, the rectangular structure of framework, comprise interconnective upper frame bar 311, lower moulding 312, left moulding 313 and right moulding 314, on the medial surface of left and right moulding, be designed with guide groove 315, front frame is installed in guide groove and can slides along guide groove, the front frame parallel connection of a plurality of pouches is stacked and placed on framework, and pouch ora switch device and pouch disconnecting means and controller are all installed in the lower moulding of framework, as shown in Figure 5, the front frame of pouch is rectangular structure also, comprise interconnective upper sheer pole 3211 and left and right vertical pole 3212, the width of cross bar length and framework matches, vertical pole is telescopic caulking gum bellows, on rubber bellows, be designed with tracheae, tracheae is communicated with controller, the top of vertical pole and the end of cross tube are fixed, the bottom of vertical pole and sheer pole end are fixed, flexible member is also installed in the hollow cavity of rubber bellows, one end of flexible member is connected with cross tube end, the other end is connected with sheer pole end, the length of the drift of flexible member and vertical pole purse up matches, pouch ora switch device comprises that control valve is controlled by controller as the high pressure gas holder of power source and control valve, and the gas in high pressure gas holder is communicated with rubber bellows by control valve, pouch disconnecting means comprises design on moulding top, left and right and the keying plate 316 of capping guide groove side, opening and closing plate is controlled and is opened or closed by controller, opening and closing the length of plate and the vertical pole length of purse up state matches, when opening and closing plate unlatching, the upper side of guide groove is opened, be installed in the front frame disengaging of the pouch guide groove that guide groove topmost is purse up shape, and drive pouch separated with body, before pouch after disengaging, frame is because the effect of flexible member continues purse up closure, pouch is now by twisting accordingly guiding principle towing and being reclaimed and carry to deck by fishing boat winch, when opening and closing plate, close, guide groove upper side is sealed again, the front frame that makes to be installed on all the other pouches in guide groove can not depart from framework.
Trawl fishing method with a plurality of pouches in parallel is, first set the separation time of trawl fishing towing time uniform distribution pouch, the fishing operation time is decided to be 4 hours, the time that pouch is collected catches disengaging is decided to be 1 hour, then the stack in parallel of the front frame of four pouches is installed in the guide groove of framework, slowly by trawlnet submerged, starting fishing boat makes trawl board move to both sides to drive wing to open, trawlnet starts to pull fishing operation, now, the front frame opening and closing device of controller opens framework the superiors pouch, gas in high pressure gas gas tank is filled with in the rubber bellows in vertical pole, promotion lower vertical bar at gas stretches forward and makes sheer pole separately form the pouch mouth of expansion, as shown in Figure 2, the catches of being caught by trawlnet continue to enter and accumulate in the pouch of the superiors by framework, operation was carried out after 1 hour, more catches in pouch, have been collected, or according to the enough catches information that has of catch monitor supervision platform transmission, controller controls the opening and closing device of the front frame of the superiors' pouch and cuts out the superiors' pouch, front frame returns back to rapidly purse up state under the pulling force effect of flexible member, simultaneously, controller is controlled the opening and closing device of the front frame of second pouch and is opened the front frame of second pouch, make the pouch mouth expansion of second pouch and push the front frame of first pouch, the catches of being caught by trawlnet will be continued to enter and be accumulated in second pouch by framework, simultaneously, before the pouch of the superiors after the complete purse up closure of frame, controller can be controlled pouch disconnecting means and open and on the moulding of framework left and right, cover the keying plate on guide groove, the front frame that is full of the superiors' pouch of catches will depart from framework guide groove, drive pouch separated with body, as shown in Figure 3, fishing boat relies on corresponding strand guiding principle tow back to separately first pouch and be promoted to deck with winch, at this moment, completed the recovery operation of first pouch, simultaneously, fishing boat is readjusted towed speed, guarantee that towing is stable, do not affect fishing operation, the like, all the other two pouches can be reclaimed and extract by same mode, last pouch can be extracted and reclaim together with trawlnet, complete the fishing operation of a trawlnet, certainly, in controller, also radio receiver can be set, the signal instruction that can receive in real time on fishing boat is controlled opening of pouch and departs from, and adapts to the fishing operation in various situations.
Embodiment 2: the trawlnet with parallel many group pouches of the present embodiment 2, comprise wing, body and net capsule, on wing, be connected with the guiding principle that drags being connected with fishing boat, net capsule is installed on body rear end and is connected with body, in the front frame vertical pole of pouch, telescopic cylinder is installed, telescopic cylinder is connected with controller, in the time need to opening the front frame of pouch, controller is controlled telescopic cylinder top and is stretched, cylinder overcomes the retraction force of the flexible member in vertical pole and drives vertical pole to extend, the upper sheer pole of front frame separately forms the pouch mouth of expansion, the catches that trawlnet is caught can be entered pouch and be collected by framework, as needed, reset, controller is controlled telescopic cylinder retraction, drive cross tube resets, simultaneously, flexible member in vertical pole also resets, enclosure pouches mouth, the other parts of the present embodiment 2 all with the appropriate section of embodiment 1 roughly the same, repeat no more herein.
In description of the present utility model, technical term " on ", D score, " front ", " afterwards ", " left side ", " right side ", " indulge ", " horizontal stroke ", " interior ", expression directions such as " outward " or position relationship are based on direction shown in the drawings or position relationship, be only for convenience of description with understand the technical solution of the utility model, more than explanation has not been done restriction to the utility model, the utility model is also not limited only to giving an example of above-mentioned explanation, the variation that those skilled in the art make in essential scope of the present utility model, remodeling, increase or replace, all should be considered as protection domain of the present utility model.

Claims (10)

1. with walking abreast, organize the trawlnets of pouches for one kind more, for the operation that drags a net in fishing of fishing boat, described trawlnet comprises wing (1), body (2) and net capsule (3), described wing be provided be connected with fishing boat drag guiding principle (11), described net capsule is located at body rear end and is connected with body, it is characterized in that:
Net capsule comprises
Framework (31), is located at body rear portion, for the connection of pouch and body and expand pouch mouth, is provided with pouch ora switch device, pouch disconnecting means and controller on framework;
Some pouches (32), for splendid attire catches, a plurality of pouches superimposed being arranged on framework in parallel, pouch mouth is provided with front frame (321), is equipped with the strand guiding principle (322) being connected with fishing boat in each pouch;
Pouch ora switch device, is located in framework, is used to open or close pouch mouth;
Pouch disconnecting means, is located in framework, controls the disengaging of pouch and body;
Controller, controls the information signal of platform transmission and controls for the fishery harvesting quantity monitoring receiving on fishing boat
Pouch ora switch device and pouch disconnecting means.
2. the trawlnet with parallel many group pouches according to claim 1, is characterized in that: the outer surface of described framework and front frame is coated with the soft rubber layer that one deck is smooth.
3. according to claim 1 and 2 with the parallel trawlnets of organizing pouches more, it is characterized in that: described framework (31) is rectangular, comprise interconnective upper and lower moulding (311,312) and left and right moulding (313,314), the medial surface of described left and right moulding is provided with guide groove (315), described front frame (321) is installed in described guide groove and can slides along guide groove, the front frame parallel connection of a plurality of pouches (32) is stacked and placed on framework, and described pouch ora switch device and pouch disconnecting means and controller are all located in the lower moulding of framework.
4. according to claim 1 and 2 with the parallel trawlnets of organizing pouches more, it is characterized in that: described front frame (321) is rectangular, comprise interconnective upper sheer pole (3211) and left and right vertical pole (3212), the width of described cross bar length and described framework matches, vertical pole is the Collapsible structure of hollow, the top of vertical pole and cross tube end are affixed, the bottom of vertical pole and sheer pole end are affixed, between the both ends of upper sheer pole, be respectively equipped with flexible member, one end of described flexible member is connected with cross tube end, the other end is connected with sheer pole end, the purse up length of the drift of flexible member and vertical pole matches.
5. the trawlnet with parallel many group pouches according to claim 4, is characterized in that: described vertical pole (3212) is telescopic caulking gum bellows, and described rubber bellows is provided with tracheae, and described tracheae is communicated with described controller.
6. the trawlnet with parallel many group pouches according to claim 5, is characterized in that: described flexible member is located in the hollow cavity of described rubber bellows.
7. the trawlnet with parallel many group pouches according to claim 4, is characterized in that: described vertical pole is provided with telescopic cylinder in (3212), and described telescopic cylinder is connected with described controller.
8. according to the trawlnet with parallel many group pouches described in claim 5 or 6, it is characterized in that: described pouch ora switch device comprises high pressure gas holder and the control valve as power source, described control valve is controlled by controller, and described high pressure gas holder is communicated with described rubber bellows by control valve.
9. according to claim 7 with the parallel trawlnets of organizing pouches more, it is characterized in that: described pouch ora switch device comprises high pressure gas holder and the control valve as power source, described control valve is controlled by controller, and described high pressure gas holder is communicated with described telescopic cylinder by control valve.
10. according to claim 1 with the parallel trawlnets of organizing pouches more, it is characterized in that: described pouch disconnecting means comprises is located at respectively left and right moulding (313, 314) the keying plate (316) of top and capping guide groove (315) sidewall, described keying plate is controlled by controller, opening and closing the length of plate and the vertical pole length that described front frame is purse up state matches, when opening and closing plate, open, the upper side of guide groove is opened, be installed in the front frame disengaging of the pouch guide groove that guide groove topmost is purse up shape, and drive pouch separated with body, before pouch after disengaging, frame is because the effect of flexible member continues purse up closure, pouch is now by twisting accordingly guiding principle towing and being reclaimed and carry to deck by fishing boat winch, when opening and closing plate, close, guide groove upper side is sealed again, the front frame that makes to be installed on all the other pouches in guide groove can not depart from framework.
CN201320558344.5U 2013-09-09 2013-09-09 Drag net with multiple sets of parallel bags Expired - Lifetime CN203523584U (en)

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Cited By (8)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN103478089A (en) * 2013-09-09 2014-01-01 浙江海洋学院 Trawl net with a plurality of parallel bag sets and catching method thereby
CN104430217A (en) * 2014-11-03 2015-03-25 大连海洋大学 Oratosquilla fake zoea fishing net
CN105076071A (en) * 2014-05-13 2015-11-25 河北省海洋与水产科学研究院 Offshore double-shop single-bag trawl with surface layer having wings for large jellyfish
CN106922634A (en) * 2017-04-11 2017-07-07 中国水产科学研究院东海水产研究所 A kind of abyssal benthos sampling network
CN108502113A (en) * 2018-04-28 2018-09-07 广东海洋大学 A kind of fishing system
CN109077033A (en) * 2018-08-30 2018-12-25 上海海洋大学 A kind of multi-joint quantitative sampling net of fish-egg larva and juvenile
CN110521681A (en) * 2019-09-29 2019-12-03 浙江海洋大学 A kind of tear-away Cod-ends of Trawl of nested type separation catches and operational method
CN113508790A (en) * 2021-05-31 2021-10-19 中国水产科学研究院南海水产研究所 Light-induced trawl net with pointed pen cap and spiral shell

Cited By (11)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN103478089A (en) * 2013-09-09 2014-01-01 浙江海洋学院 Trawl net with a plurality of parallel bag sets and catching method thereby
CN103478089B (en) * 2013-09-09 2015-07-01 浙江海洋学院 Trawl net with a plurality of parallel bag sets and catching method thereby
CN105076071A (en) * 2014-05-13 2015-11-25 河北省海洋与水产科学研究院 Offshore double-shop single-bag trawl with surface layer having wings for large jellyfish
CN104430217A (en) * 2014-11-03 2015-03-25 大连海洋大学 Oratosquilla fake zoea fishing net
CN106922634A (en) * 2017-04-11 2017-07-07 中国水产科学研究院东海水产研究所 A kind of abyssal benthos sampling network
CN108502113A (en) * 2018-04-28 2018-09-07 广东海洋大学 A kind of fishing system
CN108502113B (en) * 2018-04-28 2020-08-28 广东海洋大学 Fishing system
CN109077033A (en) * 2018-08-30 2018-12-25 上海海洋大学 A kind of multi-joint quantitative sampling net of fish-egg larva and juvenile
CN110521681A (en) * 2019-09-29 2019-12-03 浙江海洋大学 A kind of tear-away Cod-ends of Trawl of nested type separation catches and operational method
CN113508790A (en) * 2021-05-31 2021-10-19 中国水产科学研究院南海水产研究所 Light-induced trawl net with pointed pen cap and spiral shell
CN113508790B (en) * 2021-05-31 2022-07-12 中国水产科学研究院南海水产研究所 Light-induced trawl net with pointed pen cap and spiral shell

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