CN200938798Y

CN200938798Y - Device for releasing scaleph by trawl

Info

Publication number: CN200938798Y
Application number: CN 200620044481
Authority: CN
Inventors: 周爱忠
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: 2006-08-02
Filing date: 2006-08-02
Publication date: 2007-08-29
Anticipated expiration: 2016-08-02

Abstract

The utility model discloses a jellyfish-releasing unit for drag net fishing gear relating to an auxiliary device of drag net which requires a device to release the jellyfish from the nets to prevent net mesh jamming or net bursting, reducing the release rate of target fish catch, which comprises a section of bunt arranged at the upper deeping with releasing mouth and is characterized in that a tilt-positioned guiding net is provided at the front section of the bunt; the front side of the guiding net is seamed with the upper deeping of the bunt, the lateral sides of the guiding net are seamed respectively with the right and left deepings of the bunt and the fish catch inlet is arranged between the hinder side of the guiding net and the lower deeping of the bunt; a tilt-positioned separation grating is positioned at the inside of the hinder section of the bunt, the outline border of the separation grating is rectangle, crosspiece is arranged in the separation grating, vertical bars are evenly distributed from the middle to upper part of the separation grating, the lower part of the separation grating is the inlet for target fish catch, floater is equipped on the upper frame of separation grating, bound on the hinder edge of upper deeping inlet of the bunt and the floater is bound on middle part of the lower deeping of the bunt at the hinder part of the fish catch inlet.

Description

A kind of device that is used for trawlnet fishing gear release jellyfish

Technical field:

The utility model relates to the device of the jellyfish that discharges into trawlnet.

Background technology

From the middle and later periods nineties 20th century, large jellyfish takes place year after year and breaks out phenomenon in northern East China Sea and Huanghai Sea marine site, and the trend that increases the weight of is year by year arranged.A large amount of large jellyfish enter the trawlnet fishing gear, cause mesh obstruction, netting gear explosion, and the traditional work fishing ground can't be produced, and the fishing ground scope is dwindled, catch reduces, fish for cost improves.For overcoming this phenomenon, prior art is taked to open a liberation port on body, and jellyfish can be discharged.But still having the part large jellyfish to be mixed in the target catches can not discharge, though discharged the part jellyfish on the other hand, also has the target catches of higher proportion to discharge when discharging jellyfish, and output is descended greatly.

The utility model content

The utility model technical issues that need to address provide a kind of device that jellyfish is discharged from netting gear, prevent that mesh from stopping up, the netting gear explosion, reduce the release rate of target catches.

The utility model is included in the joint body that upper net plate has liberation port, there is the tilting guiding net of a slice the leading portion inboard that it is characterized in that this joint body, the upper net plate front of the front of guiding net and this joint body is sewed up, guiding net both sides respectively with this joint body about the net sheet sew up, be the introducing port of catches between the bottom of guiding net and the lower net plate of this joint body; There is the tilting separate gate of a slice the back segment inboard of this joint body, the separate gate housing becomes rectangle, crosspiece is arranged in the separate gate, the separate gate middle part is uniform vertical grid to top, the separate gate bottom is target catches through ports, the separate gate upper ledge is joined the bundle float and is pricked on the back edge of the upper net plate liberation port of this joint body, and the separate gate lower frame is pricked in the middle part of the lower net plate of this joint body at catches introducing port rear.

The utility model is owing to be provided with guiding net and separate gate on the body at the joint that liberation port is arranged, the ratio that large jellyfish is discharged from netting gear reaches more than 85%, play the effect that prevents the mesh obstruction, avoids the netting gear explosion, the release ratio of target catches effectively reduces the release rate of target catches below 20% simultaneously.

Description of drawings

Fig. 1 is the schematic diagram of releasing device.

Fig. 2 is the schematic diagram of separate gate.

Embodiment

Implement best way of the present utility model below in conjunction with description of drawings:

The utility model (see figure 1) comprises that upper net plate has a joint body of liberation port, this joint body adopts the cuboid of making the four-piece type identical with the keed girth with the keed identical materials, there is the tilting guiding net 1 of a slice the leading portion inboard of this joint body, the upper net plate front of the front of guiding net 1 and this joint body is sewed up, guiding net 1 both sides respectively with this joint body about the net sheet sew up, guiding net 1 makes catches be directed into the bottom of device, is the introducing port of catches between the bottom of guiding net 1 and the lower net plate of this joint body; There is the tilting separate gate of a slice 2 the back segment inboard of this joint body, separate gate 2 housings become rectangle, establish crosspiece in the separate gate 2, from crosspiece to housing top uniform vertical grid, separate gate 2 bottoms are target catches through ports, separate gate 2 upper ledges are joined bundle float 3, and prick on the back edge of the upper net plate liberation port 4 of this joint body, and separate gate 2 lower frames are pricked in the middle part of the lower net plate of this joint body at catches introducing port rear.When large jellyfish is occurred frequently, add this device at the final section of trawlnet fishing gear body net and the connection place of keed.Large jellyfish and target catches are under the separation of separate gate, and the target catches enter keed and are hunted down, and large jellyfish is emitted from liberation port.

Because the different employed netting gear sizes of fishing boat power are also different, the outer perimeter of this device is consistent with the girth of the keed of the employed netting gear of fishing boat, netting gear with 8 meters of the tension girths of keed network interface is an example: the girth by keed is divided into four parts, be stitched into cuboid (Fig. 1), the width of guiding net 1 is identical with upper net plate, the top and the upper net plate front of guiding net 1 are sewed up, the right and left each with about the net sheet being 30 ° of stitchings with horizontal direction, the length of guiding net 1 extends to the base till the lower net plate 400mm; Separate gate 2 housings become rectangle, separate gate 2 is made with the 10mm round steel, uniform from vertical grid of the supreme portion in middle part by interval 180mm, separate gate 2 bottoms are target catches through ports, the crosspiece of the extremely vertical grid of through port lower frame is apart from 250mm, separate gate 2 bases are 300mm with the horizontal range on the base of guiding net 1, and separate gate 2 is 50 ° of angles with horizontal direction; Liberation port 4 is to be the equilateral triangle of cutting out at the end with upper net plate etting width, strengthens around the limit with the rope of Φ PE16mm, also can join a slice net sheet at the front end of liberation port 4, and the front and the upper net plate of this net sheet is seamed to liberation port cover net 5; Separate gate 2 upper ledges join that heavy power equates in the water of the buoyancy of pricking float 3 and separate gate 2.

Claims

1. one kind is used for the device that the trawlnet fishing gear discharges jellyfish, be included in upper net plate have liberation port one the joint body, there is the tilting guiding net of a slice the leading portion inboard that it is characterized in that this joint body, the upper net plate front of the front of guiding net and this joint body is sewed up, guiding net both sides respectively with this joint body about the net sheet sew up, be the introducing port of catches between the bottom of guiding net and the lower net plate of this joint body; There is the tilting separate gate of a slice the back segment inboard of this joint body, the separate gate housing becomes rectangle, crosspiece is arranged in the separate gate, the separate gate middle part is uniform vertical grid to top, the separate gate bottom is target catches through ports, the separate gate upper ledge is joined the bundle float and is pricked on the back edge of the upper net plate liberation port of this joint body, and the separate gate lower frame is pricked in the middle part of the lower net plate of this joint body at catches introducing port rear.

2. a kind of device that the trawlnet fishing gear discharges jellyfish that is used for according to claim 1, it is characterized in that guiding net the right and left each with about the net sheet being 30 ° of stitchings with horizontal direction, the length of guiding net extends to the base till the lower net plate 400mm; Separate gate is made with the 10mm round steel, uniform from vertical grid of the supreme portion in middle part by interval 180mm, the crosspiece of the extremely vertical grid of separate gate bottom target catches through port lower frame is apart from 250mm, and the separate gate base is 300mm with the horizontal range on the base of guiding net, and separate gate and horizontal direction are 50 ° of angles; Liberation port is to be the equilateral triangle at the end with upper net plate etting width, with the rope of Φ PE16mm around the limit; The separate gate upper ledge is joined the float that the power of sinking equates in the water of pricking buoyancy and separate gate.

3. a kind of device that the trawlnet fishing gear discharges jellyfish that is used for according to claim 1 and 2 is characterized in that joining a slice net sheet at the front end of liberation port, and the front of this net sheet and upper net plate are stitched into the liberation port cover net.