JP2007185131A - Method for preventing catching jelly fish and fishing net for preventing catching jelly fish - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a method for inducing only fishes and catching without inducing jelly fishes into a fishing net on catching the fishes by the fishing net such as a fixed net, and the net for preventing catching jelly fish. <P>SOLUTION: The method for preventing catching the jelly fishes by arranging a leader net 3 protruding outward at an inducing port 4 of the fishing net, formed in the surrounding wall of an impounding net 7, and inducing the fishes toward the leader net 3 into the impounding net 7 from the inducing port 4 includes passing through the jelly fishes from a fish-inducing part 16 provided at the middle of the leader net 3, and inducing the fishes f into the impounding net 7 from the inducing port 4 by threat or evade. The fishing net for preventing catching the jelly fishes, used in the method is provided with the fish-inducing part 16 composed of a joining rope 19 provided in a horizontal direction and rectangular formed woods 22 provided so as to swing according to tidal current relative to the joining rope 19 through a joining rope 21. <P>COPYRIGHT: (C)2007,JPO&INPIT

Description

  The present invention relates to a method for guiding and catching only fish without guiding a large jellyfish into the fish net when catching the fish with a fish net such as a stationary net, and a fish net for preventing jellyfish supplementation.

  In recent years, there have been frequent occurrences of large jellyfish entering hundreds of solids in a single netting in a wide area of the Sea of Japan and in the stationary nets of Hokkaido, Aomori, Iwate Prefecture, etc. on the Pacific side. It is also confirmed that thousands or more individuals have entered the net, and jellyfish of various sizes have been confirmed, with the size being 20 cm for small umbrellas and 1 m for large ones.

  Many damages, such as delays in fishing operations and reduced freshness of fish catches, have been reported due to the large netting of large jellyfish. In addition, in the stationary net, it takes time to discharge the large jellyfish that has entered the net, and the fish caught cannot be shipped Such problems have been reported.

Therefore, in order to overcome serious fishing damage, the mesh of the fence net is enlarged, a barrier net is provided at the entrance of the fence net and the exit of the climbing net, a jellyfish outlet is provided in the box net, A method is known in which a fish net is separated from a large jellyfish by installing a safe net at a remote location and only the fish is captured. (For example, refer nonpatent literature 1.).
Naoto Honda, “Current Status of Fishing Damage and Prevention Measures by Large Jellyfish”, Marine Fisheries Engineering, Japan Marine Fisheries Systems Association, August 2004, p. 57-63

  However, if the mesh size of the fence is increased, fish will pass along with the jellyfish, resulting in a decrease in catch. In addition, although a jellyfish intrusion can be prevented by providing a barrier net at the entrance of the enclosure net or the outlet of the climbing net, there is a problem that the jellyfish debris cut by the barrier net must be removed.

Furthermore, jellyfish that have entered the box net after passing through the shut-off net are discharged from a discharge port provided in the box net when the net is lifted, and are forcibly discharged by a crushing pump, rake or large-scale The nets had to be crawled out using nets, and there were problems such as delayed netting of stationary nets and reduced freshness of fish catches due to jellyfish venom.
The present invention solves or improves these problems, and provides a method for inducing and capturing only fish without inducing the jellyfish into the fish net when capturing the fish with a fish net such as a stationary net, and a fish net therefor It is.

  The jellyfish trapping prevention method of the present invention for solving the above-mentioned problem is as follows. First, a fence net 3 is arranged to protrude outwardly from a fishnet inlet 4 formed on the peripheral wall of the enclosure net 7, and the fence In the method of guiding the fish facing the net 3 into the enclosure net 7 from the introduction port 4, by passing the jellyfish j by the fish guiding part 16 provided in the middle of the fence net 3 and threatening or avoiding the fish f Only the fish f is guided into the enclosure net 7 from the introduction port 4.

  The jellyfish trapping prevention fish net of the present invention for solving the above-mentioned problem is as follows. First, the fish f introduction port 4 of the enclosure net 7 for guiding the fish f to swim inside intersects with the peripheral wall of the enclosure net 7. In the fish net in which the fence net 3 is arranged so that one end protrudes outward in the direction to be moved, the introduction port 4 is made by passing the jellyfish j in the middle of the fence net 3 to threaten or avoid the fish f. It is characterized in that a fish guiding portion 16 for guiding the inside of the enclosure net 7 is provided.

  Secondly, the fish guiding section 16 includes a connecting rope 19 provided in the horizontal direction and a yellowtail tree 22 provided so as to be able to swing with respect to the connecting rope 19 according to a tidal current via a connecting rope 21. It is characterized by being composed.

  Thirdly, the fish catching section 2 is provided on both sides of the fence net 7 upstream and downstream of the fence net 3 in the middle.

According to the present invention configured as described above, only the catch can be guided into the box net without inducing the jellyfish in the fish net (enclosure net, climbing net, box net, etc.). Without taking time to remove the jellyfish, it is possible to catch only the catch by lifting the box net at regular intervals.
In addition, by providing a fish guide part on the fence net, only fish can be threatened or repelled, so that the fish net can be prevented from passing through and efficiently guided into the fish net. Since it passes through the guiding portion, it is possible to prevent jellyfish from entering the fishnet.
Furthermore, by providing fences, climbing nets, and box nets as supplemental parts of the fish school on the left and right sides with the fence net in the middle, fish can be captured effectively regardless of whether the tide is left or right.

  Hereinafter, jellyfish trapping prevention and fishnets according to the present invention will be described with reference to the drawings. 1 is an overall perspective view of a fish net, FIG. 2 is a plan view, and FIG. 3 is a front view of a fish guiding portion. Here, a stationary net that catches fish by a net set in a moving fish passage will be described.

  The stationary net 1 is composed of a supplement part 2 that catches the fish f and a fence net 3 that stretches like a fence in the passage of the fish f and guides the fish f to the supplement part 2. The supplement part 2 is formed so as to be line-symmetrical in the front-rear direction (up and down in FIG. 2) with the fence 3 in the middle in plan view.

  The supplementary part 2 is provided with an introduction port 4 for guiding the fish f at a position where the fence net 3 and the supplementary part 2 intersect, and a fence net 7 provided with an athletic field 6 for swimming the fish is provided via a climbing net 8. The structure is connected to the box network 9. The climbing net 8 is formed with a narrow outlet so that the fish once guided to the box net 9 does not go out of the net (formed in a horizontal direction in FIG. 2).

  The above fence net 3 and the fence net 7 are formed at a height that reaches from the sea surface to the seabed according to the water depth of the sea area of the installed stationary net 1. The enclosure net 6 is composed only of the peripheral wall, whereas the climbing net 8 and the box net 9 are both formed in a box shape consisting of the peripheral wall and the bottom.

  In the box net 9, a U-shaped end wall 11 is formed on the climbing net 8 side in front view so that the fish once guided does not escape. Since the end wall 11 has a certain height, the bottom of the climbing net 8 is formed obliquely in the upward direction from the side of the enclosure net 7 toward the box net 9. And the bottom part of the box net | network 9 becomes the structure installed in the fixed distance height from the seabed.

  The fence net 3, the fence net 7, the climbing net 8, and the box net 9 are set so that the meshes become finer in order, and the fish f finally led to the box net 9 is configured not to escape.

  In addition, the fence net 3, the fence net 7, the climbing net 8, and the box net 9 are all held by a rope 12, and the shape of the rope 12 is fixed to the seabed by an anchor 13 such as a sand bag or a coral. Yes. The rope 12 that appears on the sea surface is provided with floats 14a, 14b, and 14c for maintaining the shape of the net and indicating the position of the rope 12, and the float 14d is also provided on the upper edges of the climbing net 8 and the box net 9. Is provided.

  Next, the fish guide portion 16 provided in the middle of the fence net 3 formed to protrude outward in a substantially right angle direction with respect to the supplement portion 2 will be described with reference to FIG. The fish guiding portion 16 is provided near the supplement portion 2 and is composed of a vertical rope 17, a ring 18, a connecting rope 19, a connecting rope 21, and a yellowtail tree 22.

  The rope 17 is provided with a sandback 23 as an anchor at the lower end. The rope 17 is composed of a rope 17a on the fence 3 side and a rope 17b on the yellowwood 22 side. The rope 17 a is provided with a ring 24 a at a certain height, and the rope 24 a and the fence net 3 are connected via a connecting rope 26.

  Similarly to the rope 17a, the rope 17b is also provided with a ring 24b at every fixed height, and the other rope 17b is similarly connected to the ring 24b provided in the horizontal direction with the connecting rope 19 connected in the horizontal direction. Yes. A yellowwood tree 22 is connected to the connection rope 19 via a connection cable 21 at regular intervals.

  The yellowtail tree 22 is made of cedar board coated with white paint, and is configured so that the yellowwood tree 22 dances in accordance with the movement of the tide. It is a fishing method that uses the habit of fish f that guides f in the direction of the inlet 4 of the supplement 2. At this time, since the jellyfish j does not fear the yellowtail tree 22, it passes through the space formed by the yellowwood tree 22 and the connecting rope 19 or other gaps to the opposite side of the fence net 3 and introduces the supplement part 2. There is an advantage that no jellyfish is induced in the mouth 4.

  In this example, when the water depth in the installation sea area is about 30 m, the fish guide section 16 is about 10 (18 m), leaving about 5 (9 m) on the side of the supplemental part 2 of the fence net 3 of about 305 (549 m). Is provided. A connecting rope 19 of about 15 m is stretched about every 3 m through the ring 24 b on the rope 17 b. A briquette tree 22 is connected to the connecting rope 19 via a connecting rope 21 every about 1 m. It is sufficient that the yellowwood 22 is attached to a connecting tool such as the connecting rope 21 and has a function of floating so as to be conspicuous to fish in the water, and does not necessarily need to be a plate or a tree. For example, a foamed plastic material may be used.

  The yellowtail tree 22 has a height of about 100 cm and a width of about 60 cm. The connecting cord 21 is inserted into a hole 27 formed at the center of about 15 cm from the lower end of the yellowwood tree 22, and the yellowwood tree 22 is connected. Therefore, a space with a height of about 1 m85 cm is formed from the upper end of the yellowtail tree 22 to the upper connecting rope 19. Therefore, jellyfish j can sufficiently pass through this space.

  In addition, as described above, a plate-like yellowwood (plate) 22 connected with the connecting rope 21 and floated to drive the fish is used as a fishing tool for driving the fish into the coastal area prior to the use of the net. Known (wig net fishing method, Tottori Prefecture), a lot of strip-shaped yellowtail trees are attached to a rope to float or float.

In the method of supplementing fish f by the stationary net 1 configured as described above, the fence net 3 is installed so as to be perpendicular to the tidal current (fish passage). For example, as shown in FIG. 2, when the tidal current is in the A direction, the jellyfish j passes through the fish guiding portion 16 in the a ₁ direction, while the fish f is guided in the a ₂ direction for fear of the yellowtail tree 22.

Conversely, when the tidal current is in the B direction, the jellyfish j passes through the fish guiding portion 16 in the b ₁ direction, while the fish f is guided in the b ₂ direction because of fear of the yellowtail tree 22. The guided fish f swims in the playground 6 and then enters the box net 9 through the climbing net 8. The fish f once inside the box net 9 cannot return by the end wall 11. Thereafter, the box net 9 is fried at regular intervals (in this example, every morning) to catch the fish f that have entered the net.

  The size of the fence net constituting the stationary net of the present invention and the size and the length of the connecting rope provided in the fence net are not limited to the above description, depending on the water depth of the installation location of the stationary net, etc. It can be changed freely. Moreover, the enclosure net, the climbing net, and the box net constituting the supplementary portion can be changed without being limited to the shapes shown in the above description and drawings. Furthermore, materials such as nets, floats, and ropes can be freely changed, and the yellowwood is not limited to cedar boards and can be used without any particular limitation as long as it can float in the sea. .

  The jellyfish catching prevention method and the jellyfish catching prevention fishnet of the present invention can be used for fishing by other fishnets such as a seine net, a gill net, a purse seine, etc. It can also be applied when separating and supplementing.

It is a whole perspective view which shows the fishnet of this invention. It is a whole top view which shows the fishnet of this invention. It is an enlarged front view which shows the fish guidance | induction part of the fishnet of this invention.

Explanation of symbols

2 Supplementary part 3 Hedge net 4 Inlet 7 Enclosure 16 Fish guidance part 19 Connecting rope 21 Connecting rope 22 Yellowwood f Fish j Jellyfish

Claims (4)

  A fence net (3) is arranged so as to protrude outwardly from a fish net introduction port (4) formed on the peripheral wall of the enclosure net (7), and the fish (f) toward the fence net (3) is placed on the introduction port. (4) In the method of guiding into the fence net (7), the fish guide (16) provided in the middle of the fence net (3) is passed through the jellyfish (j) to threaten or avoid the fish (f). A jellyfish trapping prevention method in which only fish (f) is guided into the enclosure net (7) from the introduction port (4).   A fence net (3) is formed so that the fish inlet (4) of the fence net (7) for guiding the fish to swim inside projects in the direction intersecting the peripheral wall of the fence net (7) and one end outwards. ) In the enclosure net (2) from the inlet (4) by passing the jellyfish (j) in the middle of the fence net (3) to intimidate or avoid the fish (f) A jellyfish-trapping-preventing fishnet provided with a fish-guiding part (16) for guiding the fish.   The fish guide part (16) is a connecting rope (19) provided in the horizontal direction, and a bristle provided to the connecting rope (19) so as to be able to swing according to a tidal current via a connecting rope (21). The jellyfish catching prevention fishnet of Claim 2 comprised with the tree (22).   The jellyfish catching prevention fish net according to claim 2 or 3, wherein a catching part (2) for fish school is provided on both sides of the fence net (7) upstream and downstream with the fence net (3) in the middle.

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