TW202130268A - Net gear apparatus of Sergia lucens mid-water trawl fishery for reducing the catch of fish larvae and bycatch comprises a net barrel, a screener, a floating ball, a funnel net, an escape opening, and an intercepting net - Google Patents

Abstract

A net gear apparatus of Sergia lucens mid-water trawl fishery for reducing the catch of fish larvae and bycatch comprises a net barrel body connected to the terminal of the body net of a Sergia lucens trawling gear and the front edge of the net sack of the Sergia lucens trawling gear; a screener that is a round frame, and has an upper half provided with a vertical grille and a horizontal fixed rod and a lower half provided in order with a movable grille and a bare empty area; a floating ball attached to the outside of the top of the round frame; a funnel net that has a large round mouth on one side to be vertically stitched along the net barrel body on one side of the diameter, and a small round mouth on the other side and connected to the screener via a rope or a steel cable at top and bottom; an escape opening located behind the top of the screener; and an intercepting net that has a lower edge connected to the bottom of the movable grille, and an upper edge inclined by 50 degrees relative to the terminal of the escape opening and straightened to stitch, in which the intercepting net is fixedly stitched along the net barrel body.

Description

Sakura shrimp mid-level trawl fishery to reduce the catch of juveniles and mixed catches

The invention relates to a net gear device for the mid-level trawl fishery of the cherry shrimp, in particular to a net gear device for reducing the capture of the cherry shrimp and its mixed catch that have not reached the mature body length.

The Sakura Shrimp fishery in my country is a middle-level trawl fishery, and the management system is still sound. Currently, there are no fishing areas, no fishing seasons, a daily catch limit for Sakura Shrimp, sharing of Sakura Shrimp catches, and public auctions. Methods to promote the increase and stability of shrimp prices. However, the price of Sakura shrimp in my country relies too much on the Japanese market. In order to avoid price manipulation by the single market, it is necessary to open up other markets. Exploiting the European and American international markets must comply with its specifications (for example, the mandatory installation of equipment to reduce mixing in nets) or pass the MSC certification. Related domestic research pointed out that Donggang cherry shrimp fishery has the opportunity to pass MSC certification, but it is necessary to establish a mixed catch management system and implement mixed catch information monitoring (Wang and Chang, 2017).

According to the Fishery Statistics Annual Report of the Fisheries Department of the Executive Yuan's Agriculture Committee, the annual average production of cherry shrimp in the past ten years is about 1,500 tons. The fishing grounds are in the waters around Pingtung Donggang and Yilan Guishan Island. The Sakura Shrimp fishing net in my country is a multi-bag net to separate the catch species and the size of the catch. However, the mesh size of the outer bag net is too small, and it is easy to catch Sakura Shrimp and mixed catches that have not reached the mature body length. According to relevant research in my country, there are as many as 183 kinds of mixed catches from the Donggang cherry shrimp fishery, and the mixed catch rate is at least 75% by weight. If it is estimated that the mixing yield is at least 4,500 tons per year based on its mixing yield.

A large number of mixed catches will cause unnecessary waves of coastal aquatic resources in our country. If the problem of mixed catching continues to worsen, it may cause a decline in the diversity of marine aquatic resources along the coast of our country, and the amount of resources will also be rapidly depleted.

The present invention provides a netting device for reducing the capture of juveniles and mixed catches of cherry shrimp in mid-level trawl fishery, which can reduce the capture of cherry shrimp and mixed catches that have not reached mature body length.

The present invention provides a sakura shrimp mid-level trawl fishery with a net gear device for reducing catching juveniles and mixed catches, comprising: a net barrel, an inlet end connected to the end of the body net of a sakura shrimp trawl fishing gear, and the opposite outlet end It is connected to the front edge of the bag net of a cherry and shrimp trawl fishing gear; a filter is arranged in the barrel of the net, and it is a circular frame with a plurality of through holes, and the upper half of the filter There is a vertical fixed grid and a horizontal fixed rod for the fixed grids to pass through. The lower half of the filter is provided with a movable grid in the upper section and a bare area in the lower section ; At least one floating ball attached to the outer side of the top of the circular frame of the filter; a funnel net, the diameter of the front and rear ends of the net mouth is a large round mouth on one side, and a small round mouth on the other side Shape, the big round mouth is vertically stitched along the body of the net, and the top and bottom of the small round mouth are connected to the filter by ropes or steel cables respectively; an escape port is arranged behind the top of the filter and faces the net The direction of the exit end of the barrel; and an interception net, the lower edge of the interception net is connected with the bottom of the movable grille of the filter, and the upper edge of the interception net is toward the end of the escape opening on the side of the bag net Tilt it at 50 degrees and straighten it and sew it. The left and right sides of the interception net are stitched and fixed along the body of the net.

The invention can help the cherry shrimp fishery to reduce the problem of mixed catch, especially the catches that have not reached the mature body length, so as to improve the sluggishness of coastal marine resources in my country, and enhance the industrial image of the cherry shrimp fishery, so that the industry is qualified to obtain MSC certification. Obstacles to expanding international markets It is more in line with the trend of developing conservation-type trawl fishing gear in countries all over the world. The present invention is aimed at the cherry shrimp trawl fishery in my country, and the creative device is installed in the appropriate position of the net. It is expected that the effect of reducing the capture of mixed catch by more than 50% under the minimum condition that affects the target and the capture rate of high-economic species, especially It is a catch that has not reached mature body length.

1: Net gear device

2: net body

21: Entry side

22: Exit

3: filter

31: round frame

32: Through hole

33: grille

34: horizontal fixed rod

35: movable grille

36: Bare empty area

37: adjuster

371: fixed parts

372: Gate Mechanism

373: Hanger

374: Adjustment Bolt

375: Hinge

4: float

5: Funnel net

51: big round mouth

52: Small round mouth

6: Escape

7: interception net

A: Escape path of mixed catches

B: Catch path

C: central axis

N: bag net

Figure 1 is a front cross-sectional view of a net gear device for reducing the capture of juveniles and mixed catches in the mid-level trawl fishery of the cherry shrimp according to the present invention;

Figure 2 is a front view of the filter of the net gear device for reducing the capture of juveniles and mixed catches in the mid-level trawl fishery of the cherry shrimp according to the present invention;

Fig. 3 is a perspective view of a net gear device for reducing the capture of juveniles and mixed catches in the mid-level trawl fishery of the cherry shrimp according to the present invention;

Fig. 4 is an adjuster for controlling and adjusting the opening angle of the movable grille of the net gear device for reducing the capture of juveniles and mixed catch in the cherry shrimp middle-level trawl fishery of the present invention;

Fig. 5 is a top view of the net gear device for reducing the capture of juveniles and mixed catch in the middle-level trawl fishery of the cherry shrimp according to the present invention.

The embodiments of this creation are described in detail below in conjunction with the drawings. The accompanying drawings are mainly simplified schematic diagrams, which only illustrate the basic structure of the creation in a schematic way. Therefore, only elements related to the creation are indicated in these drawings. , And the displayed components are not drawn according to the number, shape, size ratio, etc. during the implementation. The actual size of the actual implementation is actually an optional design. Design, and its component layout may be more complicated.

The description of the following embodiments refers to the attached drawings to illustrate specific embodiments according to which the present invention can be implemented. The directional terms mentioned in the present invention, such as "up", "down", "front", "rear", "left", "right", "inner", "outer", "side", etc., are for reference only The direction of the additional schema. Therefore, the directional terms used are used to illustrate and understand the application, not to limit the application. In addition, in the specification, unless expressly described to the contrary, the words "including" or "including" should be interpreted as It is meant to include this element, but not to exclude any other elements.

Please refer to Figure 1 to Figure 5. The net device 1 for reducing the capture of juveniles and mixed catches in the cherry shrimp middle-level trawl fishery disclosed in this embodiment includes: a net body 2, a filter 3, at least one floating ball 4, and a funnel net 5. An escape port 6 and an interception net 7; the net body 2 has an entrance end 21 connected to the end of the body net of a cherry shrimp trawl fishing gear (as marked on the upper left side of FIG. 1), opposite to the entrance end 21 The other end is an outlet end 22, which is connected to the front edge of the bag net N of a cherry shrimp fishing gear, and the linear distance from the inlet end to the outlet end is about 327 cm; a filter 3 is arranged on the netting barrel Inside the body 2, it is a circular frame 31, and the circular frame 31 is provided with a plurality of through holes 32. In a preferred embodiment, the through holes 32 are arranged symmetrically on the central axis C of the filter 3. (Shown in Figure 2), but the through hole 32 is not limited to this embodiment. The upper half of the filter 3 is provided with a vertical fixed grid 33, and the fixed grid 33 passes through The horizontal fixed rod 34, the lower half of the filter 3 is provided with a movable grid 35 in the upper section and a bare area 36 in the lower section; at least one floating ball 4 is attached to the filter 3 The outer side of the top of the round frame 31; a funnel net 5, the diameter of the front and rear ends of the net mouth 51 is a large round mouth 51 on one side, the other side is a small round mouth 52, the big round mouth 51 along The net body 2 is sewn vertically, and the top and bottom of the small round opening 52 are respectively connected to the filter 3 with a rope or a steel cable; an escape opening 6 is provided in the filter 3 Behind the top of the sack net and toward the direction of the bag net N; an interception net 7, the lower edge of the interception net 7 is connected with the bottom of the movable grille 35 of the filter 3, and the upper edge of the interception net 7 approaches The end direction of the escape opening 6 on the side of the bag net N is inclined by 50 degrees, and is sewn after being straightened. The left and right sides of the interception net 7 are sewn and fixed along the net body 2.

It is worth mentioning that, please refer to Figure 4. In one embodiment, the movable grille 35 of the filter 3 is a design that can manually adjust the opening degree (the fixed part of the adjuster 37 and the movable grille 35 are respectively connected with a hinge 375), and the mechanism design can have various In this embodiment, the adjuster 37 shown in this embodiment can be made up of a (pair) fixing member 371 fixed on the upper half of the filter 3 and a gate mechanism 372, with one end movably connected to the movable grille 35, and the other end being movably connected to the movable grille 35. The hanger 373 connected to the gate mechanism 372 by lever principle is then used to lift the movable grille 35 upward and backward by the gate mechanism 372. When the gate mechanism 372 is close to the fixing member 371, a movable grille 35 adjustable The opening angle adjustment bolt 374 (the length of the gate mechanism is screw-locked to adjust the opening degree) is locked to achieve a design that can manually adjust the opening degree. In addition, there are many machine designs that can control the opening of the movable grille. In this embodiment, the connecting rod and the locking position are used to control the opening of the movable grille, but the mechanism used is not limited to this.

Please refer to Figure 1 and Figure 5. To sum up, the present invention uses the movement of the fishing boat to catch the fish, and the juvenile mixed catch escape path A shown in Figure 1 can allow the juvenile mixed catch to escape. During fishing operations, the movable grille can be pushed upwards in the direction of the bag net. Angle, strengthen the guiding efficiency of the catch through the filter or into the bag net, avoid the accumulation of the catch in front of the filter, which will reduce the screening effect of the catch, and even cause the net to be damaged. When the net is rewinding, it can be adjusted to a horizontal angle , To prevent the filter from being squeezed and deformed after being collected in the reel; the lower section of the filter is designed with a bare hollow, which allows the mature fish to easily enter the bag net.

In one embodiment, the circular frame of the filter is a perfect circular frame.

In one embodiment, the linear distance between the bottom of the filter and the outlet end of the net body is 145 cm, and the top of the filter is attached to the float and is inclined 10 degrees toward the inlet end of the net body.

In one embodiment, the funnel net is installed at the front end of the filter toward the entrance end of the net barrel, and the small round opening of the funnel net is about 20-40 cm away from the filter, and the interception net and the escape port are both installed Set at the rear end of the filter in the direction of the bag net.

In one embodiment, the round frame of the filter is made of stainless steel, the total weight is about 8.5kg, the frame width is 26mm, the thickness is 3mm, the frame outer diameter is 1,012mm, the inner diameter is 960mm, and the frame is chiseled with 16 holes of 12.7mm circle hole.

In one embodiment, the vertical fixed grid of the filter is composed of a round rod with a diameter of 3 mm and a distance between each rod of 13 mm.

In one embodiment, the float is a spherical float with a diameter of 7 inches.

In one embodiment, the funnel net is made of PE material with a total length of 145 cm and a mesh size of 13.47 mm. The large round mouth of the funnel net has a diameter of 1,000 mm, the small round mouth has a diameter of 500 mm, and the large round mouth Suture vertically along the body of the net, the linear distance between the net and the bottom of the filter is 182 cm, and the linear distance between the small round mouth and the filter is about 20-40 cm.

In one embodiment, the escape port is arranged behind the top of the filter and faces the outlet end of the net body, and the opening plane has a length of 87.5 cm and a width of 70 cm.

Please also refer to the attachment. The attachment shows an example of the filter 3 attached to the float 4 and the funnel net 5.

The above-mentioned embodiments or implementation modes only exemplarily illustrate the principles, features, and characteristics of the present invention The effect is not intended to limit the scope of implementation of the present invention. Anyone familiar with the art can modify and change the above-mentioned embodiments without departing from the spirit and scope of the present invention. Any equivalent changes and modifications made by using the contents disclosed in the present invention shall still be covered by the following patent application scope.

1: Net gear device

2: net body

21: Entry side

22: Exit

3: filter

31: round frame

4: float

5: Funnel net

51: big round mouth

52: Small round mouth

6: Escape

7: interception net

A: Escape path of mixed catches

B: Catch path

N: bag net

Claims (10)

A net gear device for reducing the capture of juveniles and mixed catches in the mid-level trawl fishery of Sakura shrimp, and its structure includes: A net barrel has an inlet end connected to the end of the body net of a cherry shrimp trawl fishing gear, and the other end opposite to the inlet end is an outlet end connected to the front edge of the bag net of a cherry shrimp fishing gear , The straight line distance from the inlet end to the outlet end is about 327cm; A filter is set in the net barrel, which is a circular frame, the circular frame is provided with a plurality of through holes, the upper half of the filter is provided with a vertical fixed grid, and the The horizontal fixed rod through which the fixed grid passes, the lower half of the filter is provided with a movable grid of the upper section and a bare area of the lower section; At least one floating ball attached to the outer side of the top of the circular frame of the filter; A funnel net, the diameter of the front and rear ends of the net mouth is a large round mouth shape on one side, and a small round mouth shape on the other side. The big round mouth is vertically stitched along the net body. The top and bottom of the filter are connected by ropes or steel cables respectively; An escape port is set behind the top of the filter and faces the outlet end of the net body; and An interception net, the lower edge of the interception net is connected with the bottom of the movable grille of the filter, the upper edge of the interception net is inclined 50 degrees toward the end of the escape opening on the side of the bag net, and then sewn. The left and right sides of the net are stitched and fixed along the body of the net. The net gear device for reducing the capture of juveniles and mixed catches in the cherry shrimp middle-level trawl fishery of claim 1, wherein the circular frame of the filter is a perfect circular frame. The net gear device for reducing the capture of juveniles and mixed catches in the cherry shrimp mid-level trawl fishery described in claim 1, wherein the linear distance between the bottom of the filter and the outlet end of the net body is 145 cm, and the top of the filter is attached to the The floating ball is inclined 10 degrees toward the entrance end of the net body. The Sakura shrimp mid-level trawl fishery described in claim 1 reduces the capture of juveniles and mixed catches, wherein the funnel net is installed at the front end of the filter toward the entrance end of the net body, the funnel net The small round opening is about 20-40cm away from the filter, and the interception net and the escape opening are both installed at the rear end of the filter in the direction of the outlet end of the net body. For the Sakura shrimp mid-level trawl fishery described in claim 2, the net device for reducing the capture of juveniles and mixed catches, wherein the round frame of the filter is made of stainless steel, with a total weight of about 8.5kg, a frame width of 26mm, and a thickness of 3mm, The frame has an outer diameter of 1,012mm and an inner diameter of 960mm. There are 16 through holes of 12.7mm in the frame. The net gear device for reducing the capture of juveniles and mixed catch in the cherry shrimp middle-level trawl fishery described in claim 1, wherein the vertical fixed grid of the filter is composed of a round rod with a diameter of 3mm and each rod The spacing is 13mm. According to Claim 1, the Sakura shrimp mid-level trawl fishery reduces the catch of juveniles and mixed catches, wherein the float is a spherical float with a diameter of 7 inches. The netting device for reducing the capture of juveniles and mixed catches in the cherry shrimp middle-level trawl fishery described in claim 1, wherein the funnel net is made of PE material, the total length is 145cm, the mesh size is 13.47mm, and the large round mouth net of the funnel net The diameter of the mouth is 1,000mm, and the diameter of the small round mouth is 500mm. The big round mouth is stitched vertically along the body of the net. The linear distance between the small round mouth and the bottom of the filter is 182cm. The straight line distance is about 20-40cm. The net gear device for reducing the capture of juveniles and mixed catches in the cherry shrimp middle-level trawl fishery described in claim 1, wherein the escape port is arranged behind the top of the filter and faces the exit end of the net body, which The opening plane has a length of 87.5 cm and a width of 70 cm. A net gear device for reducing the capture of juveniles and mixed catches in the mid-level trawl fishery of Sakura shrimp, and its structure includes: A net barrel with an entrance end connected to the end of the body net of a cherry shrimp trawl fishing gear, The other end relative to the inlet end is an outlet end, the outlet end is connected to the front edge of the bag net of a cherry blossom shrimp fishing gear, and the linear distance from the inlet end to the outlet end is about 327 cm; A filter is set in the body of the net. It is a circular frame. The linear distance between the bottom of the filter and the outlet end of the body of the net is 145cm. The top of the filter is attached to the floating ball and faces the net. The entrance end of the barrel is inclined 10 degrees, the circular frame is provided with a plurality of through holes, the upper half of the filter is provided with a vertical fixed grid, and a horizontal fixed rod for the fixed grid to pass through , The lower half of the filter is provided with a movable grid of the upper section and a bare area of the lower section, the circular frame of the filter is a perfect circular frame, and the circular frame of the filter It is made of stainless steel, the total weight is about 8.5kg, the frame width is 26mm, the thickness is 3mm, the outer diameter of the frame is 1,012mm, and the inner diameter is 960mm. The circular frame is provided with 16 through holes with a diameter of 12.7mm. The vertical fixing of the filter The grid is composed of a round rod with a diameter of 3mm, and the distance between the rods is 13mm; At least one floating ball attached to the outer side of the top of the circular frame of the filter, the floating ball is a spherical floating ball with a diameter of 7 inches; A funnel net, the diameter of the front and rear ends of the net mouth is a large round mouth shape on one side, and a small round mouth shape on the other side. The big round mouth is vertically stitched along the net body. The top and bottom of the filter are respectively connected by ropes or steel cables. The funnel net is installed at the front end of the filter facing the entrance end of the net barrel. The small round mouth of the funnel net is about 20-40cm away from the filter. , The funnel net is made of PE material, the total length is 145cm, the mesh size is 13.47mm, the diameter of the large round mouth of the funnel net is 1,000mm, the diameter of the small round mouth is 500mm, and the big round mouth is along the net. The cylinder body is stitched vertically, and the linear distance between it and the bottom of the filter is 182cm, and the linear distance between the small round mouth and the filter is about 20-40cm; An escape port is set behind the top of the filter and faces the outlet end of the net body, the opening plane of which has a length of 87.5 cm and a width of 70 cm; and An interception net, the lower edge of the interception net is connected with the bottom of the movable grid of the filter, the The upper edge of the interception net is tilted 50 degrees toward the end of the escape opening on the side of the bag net and then sewn. The left and right sides of the interception net are stitched and fixed along the body of the net.

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