CN2091534U - Fast round-mouth trawlnet suitable for different water depthes - Google Patents

Abstract

The utility model provides a fast round-mouth trawlnet suitable for different water depths. The trawlnet comprises a short sleeve net (5) of a multi-fork (6), a net mouth (1) which is approximately circular when the net mouth opens, a prolonged net body (4) and net coat whose belly is longer than back. When the trawlnet works, the trawlnet uses the length of a trawl warp (14) and the space between the two boats to control the water depth of the net and to aim the depth of the stock of fish in order to precisely trawl with a trawling speed higher than the trawling speed of the stock of fish. The utility model is suitable for the day and night trawling work of trawling fishes in the upper, middle and lower layers of the East Sea and the Yellow Sea.

Description

Fast round-mouth trawlnet suitable for different water depthes

The utility model provides the medium and small fishing boat of a kind of ocean wheel and becomes the quick trawlnet of change water layer round mouth that the water layer trawling is used.

Trawling is one of key operation of marine fishing.Current production based on the otter-trawl operation, amount of fishing reduces year by year, and the juvenile fish amount constantly increases, and influences the halobiontic ecological balance, has set up the closure of fishing areas and closed fishing season for this reason.Concerning east, the Huanghai Sea economic fish, as hairtail, butterfish, Chinese herring ... Deng, its individuality is bigger, and mobility all has the vertical habit that moves or perch the water layer change than the powerhouse, promptly lies prostrate the buoyancy at night to the greatest extent.In addition, a large amount of migrations in east, the Huanghai Sea, the chub mackerel, squid, the cuttlefish that go up water layer ... Deng fish, generally must use purse seine to carry out operation.In these, epipelagic fish swims generally that speed is fast, mobility is strong, so reaction is fast when assassination swashs, escape netting gear ability is strong, and the oriented deep water trend of escaping, and the energy cluster be made population response.Alleviate the demersal fishes excessive amount of fishing, the situation of the unfavorable ecological balance, must make east, Huanghai Sea upper, middle and lower-ranking fish obtain balanced use, to improve the ecological benefits of marine living resources, the medium and small wheel fishing boat in the existing ocean of performance still is confined to the effect of bottom trawling present situation so far, obviously is very necessary.

The purpose of this utility model is during a kind of energy of design is fit to, goes up the trawling of water layer fish, still can carry out the netting gear of bottom trawling.

Scheme of the present utility model is to improve to form on the basis that plentiful gently thin, the stressed even energy balance of the quick trawlnet of round mouth that the bottom trawling that obtains patent right (87213473.3) is used is unfolded.For in adapting to, the fast characteristics of epipelagic fish trip speed, use and shorten sleeve net (5), the mesh bore that increases sleeve, mouthful etting alleviates the netting gear water resistance, improves the netting gear towing speed to surpass the trip speed of fish.The cotta net (5) that designs many prongs (6) increases network interface (1) field amplitude to reach, and makes more subcircular of network interface, to increase the fish inlet height.For make netting gear about, about do not have the stability of pulling in the hydrospace lean on, increase netting gear length, the rear portion (9) of net is adopted littler than the quick trawlnet of round mouth, upper and lower similar hanging ratio, strengthen streamlined control, to avoid the netting gear afterbody to wave, improve its fish gathering, lead the fish function, and it is flexible to be convenient to the netting gear lifting.The heavy guiding principle that adds the restitution trawlnet, and replace sinker with iron chains, be equipped with suitable float, to quicken the netting gear sedimentation.Designed that abdomen mouth (2) is longer than the back of the body mouthful (3), belly is longer than back of the body net, escaped downwards to avoid fish.

Fig. 1 is a Copula net diagram of the present utility model, and Fig. 2 is the schematic diagram that netting gear is in operation, and Fig. 3 is many prongs cotta net and side guiding principle, drag the guiding principle structure chart.

Embodiment of the present utility model is shown in Fig. 1,3.Be positioned at network interface (1) two side the cotta net (5) of similar hanging ratio is up and down arranged, side guiding principle rope (7) with the sleeve end replaces netting-length, increasing the drainage amount of etting, and strengthen cotta net (5) and network interface (1) mesh diameter on every side, reduction etting fore-drag.Cotta net (5) front end has many prongs (6), substitutes the dovetail prong of the quick trawlnet of round mouth, and when towing, it is more that the field amplitude of network interface (1) is increased than the quick trawlnet of round mouth, makes network interface (1) than the quick trawlnet of round mouth Jinyuan Garden shape more.Whole body (4) is no base tallboy shape, its abdomen mouth (2) is longer than the back of the body mouthful (3), front portion (8) etting of nearly network interface (1) is well-to-do, the netting gear length overall is greater than the quick trawlnet of round mouth, and the belly etting is longer than the back etting, and rear portion (9) etting to net capsule (10) shrinks gradually like streamlined.Be furnished with iron chains (11) replacement weight at abdomen mouth (2) and cotta net (5) bottom, the back of the body mouthful (3) and cotta net (5) top are furnished with the float (12) that is complementary with the bottom iron chains, are beneficial to body (4) and sink conveniently, and net form is fully launched.

Show the situation that the utility model is in operation and pulls among Fig. 2.During trawling, link through empty guiding principle and side guiding principle (13) with draging guiding principle (14), other end and towboat link, and side guiding principle (13) links to each other with the cotta net (5) of many prongs (6) through the distolateral guiding principle rope (7) of tucking inside the sleeve, and can carry out trawling.During towing because of the resistance of netting gear own is little, so drag scooter 〉=3.5 li/hour (surpassing fish trip speed).Again because of cotta net (5) has upper and lower similar hanging ratio, thus netting gear can fully launch, and this height of etting, the existence of the streamlined form in body rear portion (9) makes the net tail be difficult for waving, and has guaranteed the stability of whole body in trawling.Because the existence of the many prongs of cotta net (5) front end (6), can make field amplitude 〉=20 meter of network interface (1), add that body is long, its abdomen mouth (2) is longer than the back of the body mouthful (3), and the belly clothing is longer than back of the body etting, thereby after fish are networked, be difficult for escaping downwards to leap up, and improve the netting gear fish gathering, lead the function of fish.

Use the utility model,, control the depth location of netting gear in water, retouch standard and fish for if fishing boat configuration level and vertical fish detector to measure shoal of fish allocation really, are adjusted the spacing of draging guiding principle (14) length and two ships.Trawlnet speed must surpass the speed of the shoal of fish, and to reach better effects, the difficulty of its trawling is high than bottom trawling.Put enough longly when draging guiding principle (14), then this netting gear can be sink to the seabed, is fit to bottom trawling equally and uses.Therefore the utility model can adapt to the trawling in east, the Huanghai Sea upper, middle and lower-ranking waters, for moving in three layers of fish farm in the waters, no matter be most volt floating fish at night, or in living in substantially, the fish of superjacent waters, can both carry out the day and night trawling of double as, give full play to the potentiality of netting gear and equipment.The utility model is promptly taken into account the breeding of protection aquatic resources, increases the kind and the quality of fishing for again, and lays a good foundation for developing the off-lying sea deep-sea fishing.

Claims (1)

1, the quick trawlnet of change water layer round mouth that uses of a kind of suitable ocean wheel fishing boat, it is to improve on dragging the quick trawlnet of round mouth of usefulness the end of to form, and it is characterized in that:

(1) be provided with to improving towing speed, alleviating both wings and netting gear front end water resistance in network interface (1) two side, replace length with the distolateral guiding principle rope of sleeve (7), the cotta net (5) that its upper and lower hanging ratio is similar, and the cotta net (5) that strengthens and the mesh of network interface (1),

(2) front end of cotta net (5), promising raising network interface (1) field amplitude, and make the many prongs of its more rotund etting (6),

(3) the abdomen mouth (2) of netting gear is longer than the back of the body mouthful (3); The front portion (8) of nearly network interface (1) is well-to-do, and etting is long than the quick trawlnet of round mouth, and rear portion (9) to net capsule (10) shrinks the body (4) that does not have end goblet type like fairshaped, outer likeness in form gradually,

(4) be furnished with in abdomen mouth (2) and cotta net (5) bottom and can make the netting gear lifting flexibly and net form is fully extended, the iron chains (11) of replacement weight; The back of the body mouthful (3) and cotta net (5) top are furnished with the float (12) that is complementary with bottom iron chains (11) weight.

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