JPH0336487B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION [Industrial Application Field] The present invention relates to trawl nets, such as bottom trawl nets and mid-layer trawl nets, for catching target fish by intentionally letting fish with excellent swimming ability escape.

[Prior art and its issues] Various fishing limits and regulations have been implemented both domestically and internationally to protect resources, such as:
In fishing quotas by fish species within the U.S. Fisheries Area in the Northern Ocean, fish species with small quotas such as silver cod reach their quotas early, and in an attempt to catch Sukemune cod, which has a large quota remaining. However, because silver cod and other fish are also caught at the same time, the current situation is that even though there is a quota remaining, it is not possible to catch Sukemune cod, which is a serious problem.

In addition, in the bottom trawling fishery exclusively for Sukemune cod, silver cod, silver cod,
Because it is required to prevent bycatch of halibut, trout, and other fish, it is extremely difficult to operate in waters where these fish species coexist.

Furthermore, since silver cod, hahiyo, and masu no suke are larger than Sukemune cod, the only way to do this is to take them on board along with Sukemune cod, then sort them and return them to the sea. Not only does it require a lot of work, but it is currently prohibited for resource protection (the fish become weaker once they are caught and put on board). The development of fishing net gear was desired.

The purpose of the present invention is to focus on the fact that silver cod, hahiyo, and masu no suke, which have many fishing restrictions, have superior swimming ability compared to fish species with large catch quotas such as Sukemune cod. The aim is to provide a seine that allows fish to escape from the net by itself, but with a similar idea to this, it is possible to simply increase the mesh size of the fish net or part of the fish-catching part (caught end). Attempts have been made to intentionally create openings in the net to let the fish that enter the net escape, but simply making the mesh larger or creating openings like this will not only catch the fish species that should be prevented from being caught. Not only do target fish species escape, resulting in extremely low fishing efficiency, but also because the density of the fish school is increasing at the fishing area, and the fish are already fatigued, resulting in increased bycatch. failed to fulfill its role of prevention.

[Means for Solving the Problems] The configuration of the present invention that solves the problems of the prior art is that, in a seine net, a leading edge opening is connected to the body net in the middle of the body net constituting the seine. It has a flapper, and a fish release part is provided in the part of the fishnet corresponding to the outside of the flapper, and the fish release part is provided all around the circumference of the fishnet.

[Example] Next, details of an example of the present invention will be described with reference to the drawings.

FIG. 1 is a perspective view, and FIGS. 2 and 3 are perspective views of other embodiments.

1 is a seine net body, and the seine net body 1 includes:
The net is roughly divided into a net opening 10 composed of a ground rope, head rope, etc., followed by a sleeve net 11, a body net 20, and a fish catching section 30 at the rear end, and
The seine is seined by the seine 60, etc., in the same way as a conventional seine, but in the present invention (embodiment),
A front edge opening 4 of a flapper 40 formed in a funnel-like structure with a net fabric is formed inside the middle part of the body net 20.
1, and a fish release part 50 is connected to the part of the fish net 20 corresponding to the outer peripheral surface of the flapper 40.
was formed. In addition, the above flapper 40
The front end opening 41 is formed to be connected to the same area as the cross-sectional area of the body net 20 corresponding to the opening 41.

The fish release part 50 shown in the embodiment of FIG. Connected by ropes 51, a long window-shaped fish release opening 5 is provided between each rope 51.
2 are formed respectively. The fish release portion 50 is located at the front edge opening 4 of the flapper 40.
1 is attached to the body net 20, or from the slightly rear part thereof to at least the part of the body net corresponding to the rear edge opening 42 of the flapper 40, and the body net between this part is formed. It is provided around the entire circumference of the upper surface (back net), side portion, and lower surface (abdominal net) of the fish 20, or only on both sides, i.e., the size of the fish release portion 50. , the range, and the arrangement position are determined depending on the species of fish to be missed, the fishing area, regulatory conditions, etc., and are not specific to those in the illustrated embodiment.

In another embodiment shown in FIG. 2, the fish release part 50 is formed by a fish release net 53 that is larger than the mesh size of the flapper and larger than 1/2 of the maximum circumference of the fish to be released. There is.

Furthermore, in another embodiment shown in the third example, the fish release part 5
0 is a fish release opening 54 provided in 20 parts of the fish net. That is, the front ends of a small number of ropes 55 are tied to the rear edge of the front fish net 20, and the rear ends are tied to the rope 22 forming the opening at the front end of the rear fish net 21, allowing the fish to escape and the opening 54 is formed. In addition, the above rope 5
5 may be a continuous rope structure from the front body net 20 and the sleeve portion to the rear body net 21.

Further, the flapper 40 has a front edge opening 41 whose entire circumference is attached to the inside of the body net 20, and a net which is constricted in a funnel shape toward a rear edge opening 42 having a smaller cross-sectional area than the front edge opening 41. The basic form is
The net fabric of the fish net 20 or a part of the fish release part 50 may be used as part of the circumferential surface of the flapper 40. In any case, the opening area of the rear edge opening 42 of the flapper 40 is
2. Or, the outer peripheral surface of the flapper 40 and the fish net 2 should be made smaller than about 2/3 of the cross-sectional area of the fish release part.
0 or the fish release part 50 to provide a space in which the fish can swim.

[Explanation of operation] Next, to explain the operation based on the above embodiment, when the seine net shown in the above embodiment is cast and towed in the sea or on the seabed, a net is drawn into the net from the net opening 10. The school of fish that has entered the net swims in the direction of the net (toward the opening of the net) along with the net, but as the seine fishing gear advances, the school of fish gradually lags behind, enters the flapper 40, and then swims toward the net opening. It enters the rear body net portion through the trailing edge opening 42. Fish with poor swimming ability, such as Sukemune cod, are gradually pushed to the fish catching section 30, but fish with excellent swimming ability, such as silver cod, hahiyo, and Masunosuke, are sent to the fishing section 30. After exiting the edge opening 42 or approaching the fish catching section 30, the user feels something abnormal (dangerous) and tries to escape by swimming in the direction of the seine.
A long-window-shaped fish trap that moves forward through the space between the outer peripheral surface of the fish net and the fish trap 50, and has a fish trap 50 with a mesh that is sufficiently larger than the fish net and the ropes of the fish trap 50 are arranged in parallel. Find the opening 52, the large fish escape net 53 as shown in Figure 3, or the large fish escape opening 54 as shown in Figure 3, use your remaining swimming power to escape outside the seine, and catch the fish. You can avoid it.

[Effects of the Invention] As described above, according to the configuration of the present invention, the following effects can be obtained.

It is possible to rationally prevent by-catch of fish species with excellent swimming ability that enter the net, and select and catch only fish species with poor swimming ability, and domestic and international fishing quota regulations can be implemented for each species of fish. Given the current situation, the present invention is extremely useful.

[Brief explanation of the drawing]

FIG. 1 is a perspective view, and FIGS. 2 and 3 are perspective views of other embodiments. 1... Drag net, 10... Net opening, 11... Sleeve net, 20... Fish net, 21... Rear fish net, 22...
... Rope, 30 ... Fish catching part, 40 ... Flapper, 41 ... Leading edge opening, 42 ... Trailing edge opening,
50...Fish release portion, 51...Rope, 52...Long window-shaped fish release opening, 53...Fish release net with large mesh, 54...Fish release opening, 60...Seine net.

Claims (1)

[Scope of Claims] 1. A seine net, which has a flapper with a front edge opening connected to the seine in the middle of the seine constituting the seine, and the seine that corresponds to the outside of the flapper. A seine net characterized by having a fish release section. 2. The seine net according to claim 1, wherein the fish release portion is provided around the entire circumference of the seine net. 3. The seine net according to claim 1, wherein the fish release portion is provided in a part of the fish net. 4. The seine net according to claim 1, 2, or 3, wherein the fish release portion is constituted by a sparse rope extending in the front-rear direction of the seine net. 5. Claims 1 and 2, or, Seine net described in Section 3.