JP2010068782A - Method for preventing unintentional capture of sea bird in long line fishing and device for the same - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a method for preventing the unintentional capture of sea birds in a long line fishing for preventing the unintentional capture of the sea birds generated by catching thrown bait by the sea birds in various long line fishing such as tuna long line fishing, etc., and a device for the same. <P>SOLUTION: This method for preventing the unintentional capture of sea birds in the long line fishing performed by binding a multiple number of branch lines 5 to a trunk line 4 delivered from a hull 3 of a fishing boat, and throwing out the baits 6 attached to hooks at the tip end of the branch lines 5 into the sea so as to extend the line is provided by covering a fixed region close to the hull 3 from which the baits 6 are thrown and a fixed region in which the sea birds S can catch the thrown baits, by a bird-protecting net 1 having a prescribed size, and the device for preventing the unintentional capture of the sea birds in the long line fishing is provided by consisting of the bird-protecting net 1 equipped as freely winding up to and delivering from the hull 3 and covering the fixed region closing to the hull 3 from which the baits 6 are thrown out, and the fixed region in which the sea birds S can catch the thrown out baits 6. <P>COPYRIGHT: (C)2010,JPO&INPIT

Description

  The present invention relates to a method for preventing seabird bycatch in a longline fishery and an apparatus thereof, and in particular, in various longline fisheries such as a longline fishery, to prevent bycatch of seabirds by seabirds capturing the fed food. is there.

  In the longline fishery, when a trunk line is unloaded from several kilometers to hundreds of tens of kilometers from a liner on the hull of a fishing boat, a number of branches are attached to the trunk line at appropriate intervals. The bait is fed on the hook at the tip of the branch rope, and is fed in a predetermined direction manually by the worker or using a feeder. In general, it is often fed at about 30 degrees on the port side in consideration of vortex flow caused by the screw of the hull. The fed bait flies in the air, reaches the sea surface, and eventually settles in the sea. This feeding is usually carried out about 3000 times in a single pouring work, and its quality is an important work that greatly affects the catch.

  As one of the most important issues in the longline fishery in recent years, seabirds such as albatross and waterbirds catch the bait thus fed, and as a result, seabirds are caught on fishhooks and die by seabirds. There is. While the fed bait is in the air, drifting on the sea surface, or until it sinks to a predetermined depth, seabirds fly and catch the bait, resulting in a hook on the fishhook. . In particular, when the bait is fed within 6 m from the hull, the loss rate of the bait becomes high because of the long time that it stays on the sea surface due to the influence of the screw of the ship.

  For fishermen, seabirds lose their precious bait for fishing, and from the viewpoint of animal welfare, if no measures to prevent bycatch are taken to protect seabirds, the longline fishing itself is prohibited. There has been a complaint that this should be done, and the voices are growing year by year in the countries around the sea where the longline fishery is engaged. The albatross, in particular, is an internationally protected bird and is threatened with extinction, and the damage of bycatch is high, so the prevention of bycatch is an urgent issue. Because the longline fishery is mainly pelagic fishery, it cannot be done without the understanding of neighboring countries.

  Therefore, in Japan, the “Japan's National Action Plan to Reduce the Accidental Seabird Capture in Longline Fisheries” has been adopted, and measures to prevent accidental bycatch in the pelagic longline, nearshore longline, and coastal longline fisheries. Dealing with has been put into practice. In addition, other small-line longline fisheries operating off the coast of Japan, which are thought to have few incidental bycatches due to the importance of the case, are also included in the action plan.

Therefore, traditionally, in order to avoid the influence of the screw and reduce the time to drift to the sea surface by feeding more far away, the physical and mental burden of the worker is reduced, and more appropriate feeding is performed. In order to do this, feeding using a feeding machine has been common to manual feeding (Patent Document 1). In addition, in order to prevent seabirds from approaching the longline, a pole with a predetermined height was set up at the stern of the hull, and a rope with many windsocks connected to the tip of this pole to make the winds blow in the wind. By means of this, a means is adopted in which seabirds guard against this and prevent access to the longline (Patent Document 2). Furthermore, an electric shock wire is stretched behind the stern of the hull, and a DC pulse voltage output from the DC pulse generator circuit is applied between the electrodes arranged in the electric shock wire so that the There is also provided means for preventing an approach to a long line by generating an electric shock to the seabird and applying an electric shock to a seabird trying to capture food (Patent Document 2).
Japanese Patent No. 2597345 JP 2001-238585 A

  In recent years, the demand for protection of seabirds, especially albatross, has been very strong, and it can even be said that it is difficult to continue longline fishing unless it can prevent this bycatch of albatross. By providing the feeding machine shown in Patent Document 1, it has become possible to stably feed bait before 6 m from the hull that is not affected by the screw, but in the air, the sea surface, and the sea after feeding. The capture of is not gone. By the way, the albatross has a diving ability, and if it is less than 3 m, it can dive into the sea and catch food.

  Moreover, although the windsock shown in patent document 2 has an effect at the beginning, a seabird becomes accustomed when a fixed time passes and the effect decreases. Furthermore, there is no continuous effect of giving an electric shock to seawater shown in Patent Document 2, and there is a possibility of causing damage to seabirds, which is not a preferable means from the viewpoint of seabird protection and is not effective. .

  Therefore, in view of these circumstances, by segregating the seabirds physically from the bait, in various longline fisheries such as the longline fishery, it is safe for the bycatch of seabirds by the seabirds to capture the bait being fed, and It is an object of the present invention to provide a method and apparatus for preventing seabird bycatch in a longline fishery that can be reliably prevented.

  In order to achieve the above-mentioned object, the present invention sequentially attaches a number of branch ropes to a trunk rope drawn out from the hull of a fishing boat, and feeds food fed on a fishhook at the tip of the branch rope into the sea. In longline fisheries that are designed to be lined, longline fisheries that cover a certain area close to the hull where food is fed, and a certain area where seabirds can catch the food that is fed, are covered with a bird net of a predetermined size. The seabird bycatch prevention method in Japan is provided as a basis.

  Specifically, the air between the hull where the fed bait flies and the surface of the sea and a certain sea level after landing are covered with a bird-proof net, and the seabird cannot capture the fed bait. Isolate the fed bait from seabirds by covering the sea surface until it sinks into the deep sea.

  Furthermore, in the longline fishery, a large number of branch ropes are sequentially attached to the trunk line drawn from the hull of the fishing boat, and the bait that is fed to the hook at the tip of the branch rope is thrown into the sea. A seabird bycatch prevention device, which is equipped with a hull so that it can be wound and unwound freely, and is fed from the hull to capture a certain area close to the hull where food is fed, which is fed by seabirds. An apparatus for preventing bycatch of seabirds in a longline fishery consisting of a bird net covering a certain area that can be provided.

  Specifically, the bird net has a configuration in which a large number of scoops are arranged at a predetermined interval, and the scoops are connected with a weft thread at a predetermined interval in the width direction and formed in a lattice shape of a predetermined size. A structure equipped with a mesh-shaped entanglement prevention net of a predetermined area in the part adjacent to the connecting part, the base end part excluding the connecting part of the bird-proof net, the distal end part, and a tube body attached in the width direction at predetermined intervals A configuration in which a seabird repellent member is provided on the weft in the range from the entanglement prevention net to a predetermined length direction, and the fed out bird prevention net is in the air and between the hull where the fed bait flies and the sea surface. The structure for covering a certain sea surface after water and the fed-off bird net provide a structure for covering the sea surface until the fed food is submerged in the sea at a depth where sea birds cannot capture. Furthermore, the structure which isolates the bait fed from the seabird by the extended bird-proof net is provided.

  According to the present invention having the above configuration, a certain area close to the hull to which bait is fed, an air between the hull and the sea surface where the fed bait flies, and a certain sea level after landing, feeding In order to physically isolate seafood from the seabirds by covering the areas where the seabirds can catch the seafood (air, sea surface, sea) with a predetermined size of bird net, It is possible to reliably prevent seabirds from being caught by seabirds. Furthermore, the seabird repellent member attached to the bird net can prevent the seabird from approaching the feeding sea area. Since this bird net is equipped so that it can be drawn out and wound up from the hull, it can be used only when it is necessary to perform feeding work, and it does not interfere with other work.

  DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS A preferred embodiment of a method for preventing seabird bycatch in a longline fishery according to the present invention and an apparatus therefor will now be described with reference to the drawings. FIG. 1 is a side view showing an embodiment of the present invention, FIG. 2 is a plan view showing a part of FIG. 1 cut away, and the seabird bycatch prevention device is a stern at a position higher than the feeding place of the hull 3. The net winch 2 equipped on the net winch, and the net winch 2 is wound around the net winch 2 so as to be freely wound and fed out, and is fed out from the net winch 2 so as to cover the area where the seabird S can be fed. It consists of a bird net 1.

  Reference numeral 4 is a trunk line, which is generally used to advance the ship using a predetermined rope feeder 7 for sequentially feeding the trunk line 4 from the stern of the hull 3 that is navigating in the traveling direction f at a speed of about 11 knots. It is sequentially looped into the sea in the direction opposite to the direction f. At the time of laying, the base ends of a large number of branches 5 having a length of about 40 m and wound in a coil shape are sequentially bound to the trunk rope 4 through snaps at appropriate intervals. The port 6 of the hull 3 is ported by using a feeding machine (not shown) in which the bait 6 loaded on the fishing hook provided at the tip of the branch rope 5 is installed adjacent to the rope-feeding machine 7 or by an operator by hand. Feed in the direction. Reference numeral 8 denotes a radio buoy and / or a float, which is attached to the trunk rope 4 at predetermined intervals to indicate the position of the trunk rope 4 after throwing and / or to give buoyancy.

  The bait 6 thrown in the air reaches the sea water of about 11 m from the hull 3 and gradually sinks with the passage of time. 1 and 2, point A indicates the position of the stern of the hull 3. The feed 6 fed by the feeder or manually is separated from the stern of the hull 3 by 11 m in the stern direction (opposite to the traveling direction f), and at a point B separated by 7-8 m in the horizontal direction from the trunk 4. Then land on the sea surface 9. Thereafter, as the hull 3 advances, the coiled branch rope 5 gradually extends linearly, and the bait 6 sinks into the sea while moving below the trunk rope 4. Thus, since the branch rope 5 is wound in a coil shape, the bird net 1 can sufficiently cover the bait 6 if the width W is about 4 m.

  The point C shows the position of the bait 6 at the time when 5 seconds have passed since the feeding, 27.5 m away from the stern of the hull 3, away from the stern, and 6-7 m away from the trunk 4 in the horizontal direction. And sinks to about 2.5m below sea level. The point D shows the position of the bait 6 at the time when 10 seconds have passed after feeding, and is separated from the stern of the hull 3 by about 55 m in the stern direction and separated from the trunk 4 by about 4 to 5 m in the horizontal direction. It sinks to about 5m below sea level. The point E shows the position of the bait 6 at the time when 20 seconds have passed after feeding, and is about 110 m away from the stern of the hull 3 in the stern direction, and 3 to 4 m away from the trunk 4 in the horizontal direction. It sinks to about 10m below sea level. F point shows the position of bait 6 at the time when 30 seconds have passed after feeding, and it is separated from the stern of hull 3 by 165m, in the stern direction, and separated from trunk 4 by 0-2m in the horizontal direction. It sinks to about 15m below sea level. This relationship is summarized as shown in Table 1.

  In the present invention, the bird net 1 is extended from the net winch 2 so that a certain area close to the hull 3 to which the bait 6 is fed, that is, the fed bait 6 has a depth that seabirds cannot capture. It is characterized in that bycatch of seabirds is prevented by physically covering the sea surface until it sinks into the sea and the area where seabirds can feed bait 6 that has been fed. 3 is a plan view showing a state in which the bird net 1 is extended, FIG. 4 is a plan view on the base end L1 side, and FIG. 5 is a plan view on the front end L4 side. The bird-proof net 1 has a rectangular shape having predetermined vertical and horizontal dimensions, and a plurality of scissors 10 having a predetermined length are arranged at predetermined intervals, and these sub-several scissors 10 are arranged in the width direction by the weft 11. Connected at a predetermined interval to form a mesh of a predetermined size. The bird net 1 is preferably colored in a color or color-coded pattern that seabirds refrain from. In the embodiment, five scoops 10 having a length of 100 m are arranged at intervals of 1 m, and connected by wefts 11 at intervals of 1 m in the width direction. Therefore, as a whole, the entire length L is 100 m, the entire width W is 4 m, and the whole is colored yellow. The mesh size of 1 m × 1 m constituted by the sword 10 and the weft 11 is selected to prevent the entry of seabirds and to minimize the influence of wind and waves.

  And the base end part L1 of the snoring 10 is used as a connection part for winding the bird net 1 around the net winch 2 without arranging the weft 11 over a length of about 5 m. Moreover, the area of about 5 m in length which continues to the base end part L1 does not arrange | position the weft 11, but is comprised as a fine mesh-shaped entanglement net part L2. This entanglement prevention net part L2 is for preventing the bait 6 fed by a feeder or a worker's manual work from being entangled with the bird net 1 in the air.

  Further, in the center portion L3 of the area having a predetermined length from the area of the entanglement prevention net portion L2, about 60 m in the illustrated example, the weft 11 surrounded by the sword 10 as shown in FIG. The member 12 is attached. In the illustrated example, a polyethylene thread ribbon is V-shaped and connected at two points. The seabird repellent member 12 swings in the air, the sea surface, and the sea, thereby indicating a seabird. L4 is a tip portion having a predetermined length continuous to the central portion L3, in the illustrated example, a length of about 30 m, and includes only the scoop 10 and the weft 11. The seabird repellent member 12 is not limited to the polyethylene yarn ribbon described above, and any member that has a threat to the seabird and has a descriptive effect can be used. 10, and the shape, color, and mounting location can be arbitrarily selected.

  Then, as shown in FIG. 8 which is a partially enlarged plan view of the bird net 1 of FIG. 7 and a side view thereof, the end portion on the base end portion L1 side of the entanglement net portion L2, the both end portions and the front end portion of the front end portion L4. Tubes 13 for preventing twisting of the bird net 1 are mounted in the width direction of the bird net 1 at positions 10 m apart from both ends of the portion L4. As shown in FIG. 9, the tube body 13 includes a hollow tubular tube body 13a and flanges 13b attached to both ends, and appropriate cords are provided to the tube body 13a through holes 13c drilled in the flange 13b. Is fixed to the bird net 1. The tubular body 13 functions as a stabilizer and prevents the bird net 1 from being twisted by waves or the like. The mounting position of the tube body 13 is not particularly limited, and may be an arbitrary portion of the bird net 1.

  The bird net 1 having the above configuration is installed on the hull 3 at a position higher than the feeding place, specifically on the upper deck of the feeding place at the stern. FIG. 10 is a front view showing a state in which the entanglement preventing net portion L2 of the bird net 1 is wound up, and FIG. 11 is a plan view thereof. As shown in FIGS. 10 and 11, in plan view, a pair of legs 14, 15, and 16, which are erected at a predetermined interval in the vertical direction, are spaced apart at a predetermined interval in the horizontal direction. Horizontal rails 17, 18, and 19 are installed in the horizontal direction on the upper surfaces of the pair of leg portions 14, 15, and 16, respectively. A pair of rails 20a and 20b spaced apart from each other by a predetermined distance are laid on the three horizontal rails 17, 18, and 19 and fixed by fixtures 21, respectively. One end of each of the pair of rails 20a and 20b is positioned on the horizontal rail 17 and fixed by a fixture 21, but the other end is extended from the horizontal rail 19 and is laid out so as to protrude a predetermined distance. Yes.

  Reference numeral 22 denotes a rotating shaft, one end of which is connected to an electric motor 23 for rotationally driving the rotating shaft, and the other end is pivotally supported by a bearing 25 mounted on an L-shaped bracket 24 and is mounted on a peripheral portion. A drum 26 for winding and unwinding the birdproof net 1 is fixed. Reference numeral 27 denotes an arcuate guide member projecting in a drum shape so as to guide the winding / unwinding of the bird net 1. The lower surface of the electric motor 23 is provided with a connecting tool 28, and the lower surface of the bracket 24 is provided with a connecting tool 29, and the electric motor 23 and the bracket 24 are arrowed on the pair of rails 20a and 20b via the connecting tools 28 and 29. As shown by Y, it is slidable and can be fixed via the coupling tools 28 and 29 at an arbitrary position in the sliding range.

  Therefore, as shown in FIGS. 10 and 11, the drum 26 is slid to the bracket 24 side (right direction in the figure), and the bird net 1 is fed out and wound with the drum 26 protruding from the cross rail 19. Also, the bird net 1 can be unwound and wound while the drum 26 is slid in the direction of the electric motor 23 and the electric motor 23 is in close contact with the cross rail 17 (not shown). The drum 26 is made slidable in this way, because the bait 6 is fed in the port side of the trunk rope 4 that is drawn out at the time of the pouring, so that the birds are protected in an area separated from the trunk rope 4 in the horizontal direction. Net 1 can be extended.

  Next, a method of preventing seabird bycatch using the seabird bycatch prevention apparatus in the longline fishery having the above configuration will be described. FIG. 12 is a plan view showing a state when the bird net 1 is extended, and FIG. 13 is a side view thereof. As shown in the figure, the net winch in which the base end L1 is fixed to the drum 26 and the bird net 1 is wound around the stern of the hull 3 on the upper deck where the rope feeder 7 shown in FIG. 2 is installed at a position 1 to 2 m away from the rope feeder 7 of the trunk rope 4 in the horizontal direction. Since the drum 26 is slid in the direction of the bracket 24 as shown in FIG. 10 and fixed in a state of protruding from the cross rail 19, it protrudes from the hull 3 in the port direction as shown in FIG. .

  The motor 23 of the net winch 2 is driven in the state described above while navigating prior to the trunk line 4 feeding operation and the bait 6 feeding operation which are normally performed while navigating in the forward traveling direction f at about 11 knots per hour. By rotating the drum 26 in the feed-out direction, the bird-proof net 1 is drawn out from the front end portion L4 to the sea surface 9 sequentially. In addition, every time the main rope 4 is unrolled for a certain length during the pouring work, it is necessary to attach a radio buoy and / or a float 8 to the main rope 4. If it is drawn out, the inserted radio buoy 8 may be entangled. Therefore, the bird net 1 is temporarily wound up, the radio buoy 8 is inserted, and then the bird net 1 is extended again.

  As the bird net 1 is drawn out while being towed by the navigating hull, the bird net 1 is located on the port side of the main rope 4 as shown in the plan view showing the state in which all the bird nets 1 are drawn. A certain area close to the hull 3 to which the bait 6 is fed, that is, a depth at which the fed bait 6 cannot be caught by seabirds, separated by a predetermined width dimension W2 (about 2 m in the embodiment). The surface of the sea until it sinks into the sea, and a certain sea area (in the example shown, the bird net 1 has a total length L of 100 m and a total width W of 4 m in the illustrated example) that can capture the bait 6 fed by seabirds physically Is covered. The extended bird-proof net 1 forms a triangular space as shown in FIGS. 1 and 13 in the vertical plane between the hull 3 and the sea surface 9, and the bird-proof net 1 beyond that is on the sea surface. Positioned and towed at sea level 9 with hull 3. As a result, the air and the sea surface between the hull 3 and the sea surface 9 that can capture the food 6 fed by the seabird are covered with the bird net 1, and the fed food 6 is physically isolated from the seabird. To do.

  First, the flying food 6 is covered with the bird net 1 until the food 6 fed manually by the feeder or the worker flies through the air and reaches the sea surface 9. It is not caught by seabirds. Moreover, the branch rope 5 to which the bait 6 fed at a predetermined angle in the port side of the trunk rope 4 is mounted has a length of 40 m and is wound in a coil shape. Since it is sailing at about 11 knots, the horizontal distance between the bait 6 and the trunk line 4 after landing on the sea surface is about 7-8 m as shown at point B in FIG. 1 protrudes in the horizontal direction from the sea area covered by the ship, but moves to the lower side of the trunk line 4 by the navigation of the hull 3, so at the point C 5 seconds after feeding shown in FIG. Then, since it enters the sea area covered by the bird net 1, it is not captured by seabirds.

  The diving ability of the albatross, which is a typical example of seabirds to prevent bycatch, is about 3 m, and at D point 10 seconds after feeding, the horizontal distance from the trunk line 4 is 4 to 5 m, Since the depth also sinks about 5m, it is not captured by seabirds. And at E point where 20 seconds have passed since feeding, since it is about 110 m away from the stern of the hull 3 in the stern direction, it will deviate from the sea area covered by the bird net 1 having a length distance L of 100 m already. However, since it sinks to a depth of about 10m, it is no longer caught by seabirds. Therefore, since it is not captured at D point of 55 m from the stern, it is sufficient that the total length L of the bird net 1 is about 100 m.

  Further, since the bird net 1 is fed out 2 m away from the trunk rope 4 in the port direction by sliding the drum 26 in the direction of the bracket 24, the end of the bird net 1 in the port direction is the trunk rope. 4 to 6 m away, and the bait 6 that has landed will be instantaneously moved to the covered area of the bird net 1 by the navigation of the hull 3, and physically segregated from the seabird, so that it will be captured by the seabird. There is no. Therefore, it is sufficient if the total width W of the bird net 1 is about 4 m.

  The fed-out bird net 1 covers the area where the sea birds can be fed, and thereby physically isolates the bait 6 and the sea birds. Since the seabird repellent member 12 is mounted over a length of 60 m and a width of 4 m, the presence of the seabird repellent member 12 can also keep the seabird away from the fed bait 6. These synergistic effects can effectively prevent seabird bycatch.

  Note that the bird net 1 may be fed out at a position close to the main rope 4 depending on the feeding angle and feeding place without sliding the drum 26 in the direction of the bracket 24. Then, after the pouring and feeding operations are completed, the bird net 1 is wound around the drum 26 of the net winch 2 and the operation is completed.

  According to the present invention, various longline fisheries are used to physically isolate the fed bait from seabirds by covering the areas (air, sea, and sea) where seabirds can be captured with a predetermined size of a net. In, it is possible to reliably prevent seabirds from being caught by seabirds capturing the fed food. Furthermore, the seabird repellent member attached to the bird net can prevent the seabird from approaching the feeding sea area. Since the bird net is wound around the net winch so as to be freely retracted and wound up, it can be used only when it is necessary to perform feeding work, and does not interfere with other work.

The side view which shows one Embodiment of the bycatch prevention method of the seabird in the longline fishery concerning this invention, and its apparatus. The top view which cuts and shows a part of FIG. The top view of the state which extended the bird-proof net. The top view of the base end part side. The top view by the side of a front-end | tip part. The partial enlarged plan view of a bird-proof net. The partial enlarged plan view of a bird-proof net. The side view of FIG. The side view of a tubular body. The front view which shows the state which wound up the tangle prevention net part of a bird-proof net. The top view of FIG. The top view which shows the state at the time of extension of a bird-proof net. The side view of FIG.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 ... Bird net 2 ... Net winch 3 ... Hull 4 ... Trunk rope 5 ... Branch rope 6 ... Feed 7 ... Liner 8 ... Radio buoy 9 ... Sea surface 10 ... Scoring 11 ... Weft 12 ... Seabird repellent member 13 ... Tube 14, 15, 16 ... Legs 17, 18, 19 ... Cross rails 20a, 20b ... Rails 21 ... Fixing tool 22 ... Rotating shaft 23 ... Electric motor 24 ... Bracket 25 ... Bearing 26 ... Drum 27 ... Guide member

Claims (14)

In the longline fishery where a large number of branch ropes were sequentially attached to the trunk line drawn from the hull of the fishing boat, and the bait fed on the hook at the tip of the branch rope was thrown into the sea,
A method for preventing seabird bycatch in a longline fishery, characterized in that a certain area close to a hull to which bait is fed is covered with a bird-proof net of a predetermined size. In the longline fishery where a large number of branch ropes were sequentially attached to the trunk line drawn from the hull of the fishing boat, and the bait fed on the hook at the tip of the branch rope was thrown into the sea,
A method for preventing bycatch of seabirds in longline fishery, characterized in that a certain area where seabirds can be fed is captured by a predetermined size of a bird net.   The method for preventing seabird bycatch in a longline fishery according to claim 1 or 2, wherein a bird's net covers the air between the hull and the sea surface where the fed bait flies and the sea surface after landing.   The method for preventing seabird bycatch in longline fishery according to claim 1, 2 or 3, wherein the surface of the fed bait is covered until the sea surface sinks into the sea at a depth where seabirds cannot capture.   The method for preventing seabird bycatch in longline fishery according to claim 1, 2, 3 or 4, wherein the fed bait is isolated from seabirds by a birdproof net. A large number of branch ropes are sequentially attached to the trunk line drawn from the hull of the fishing boat, and the seabirds in the longline fisheries are fed into the sea by feeding the bait loaded on the fishing hook at the tip of the branch line. A bycatch prevention device,
Bycatch of seabirds in longline fishery, which is equipped with a bird net that covers a certain area close to the hull where the bait is fed. Prevention device. A large number of branch ropes are sequentially attached to the trunk line drawn from the hull of the fishing boat, and the seabirds in the longline fisheries are fed into the sea by feeding the bait loaded on the fishing hook at the tip of the branch line. A bycatch prevention device,
Seabirds in longline fisheries are equipped with a bird net that covers a certain area where seabirds can catch the bait that is fed by being fed from the hull so that it can be wound and unwound freely. Bycatch prevention device.   The seabird in the longline fishery according to claim 6 or 7, wherein the birdproof net is formed by arranging a large number of scoops at predetermined intervals, connecting the scoops with wefts at a predetermined interval in the width direction, and forming a grid of a predetermined size. Bycatch prevention device.   The seabird bycatch prevention device in longline fishery according to claim 8, wherein a mesh-shaped entanglement prevention net having a predetermined area is provided in a portion adjacent to the connecting portion of the bird protection net.   The seabird bycatch prevention device in longline fishery according to claim 8 or 9, wherein a tube is attached in the width direction at a predetermined interval from the base end portion, the tip end portion, and the tip end portion excluding the connecting portion of the birdproof net.   The seabird bycatch prevention apparatus in the longline fishery according to claim 8 or 9, wherein a seabird repellent member is provided on the weft in a range in a predetermined length direction from the entanglement prevention net.   The extended bird-proof net covers the air between the hull from which the fed bait flies and the surface of the sea, and a certain sea level after landing, The claim 6, 7, 8, 9, 10, or 11 A seabird bycatch prevention device for longline fisheries.   The fed bird-proof net covers the sea surface until the fed food sinks into the sea at a depth that seabirds cannot capture, The claim 6, 7, 8, 9, 10, 11, or 12 A seabird bycatch prevention device for longline fisheries.   The seabird bycatch prevention device in longline fishery according to claim 6,7,8,9,10,11,12 or 13, wherein the fed bait net isolates the fed food from the seabird.

Images