JPH07213196A - Stationary net - Google Patents

Abstract

PURPOSE:To obtain a stationary net having a structure to select and release small fry having high resource value and relatively low commercial value without landing the fry. CONSTITUTION:A bag-shaped 2nd bag 12 is connected through an openable fastener 13 to the back of a bag 8 of a bag net 7 to finally collect the caught fish. The mesh size of the 2nd bag 12 is made to be larger than that of the bag 8 of the bag net. The kind of fish in the net is observed before completely hoisting the bag 8 of the 2nd bag net from the water surface to choice whether the net is hauled after opening the fastener 13 or without opening the fastener. When the ratio of the fry of a large-sized migratory fish having high resource value relative to commercial value in the net is high, the fry is released through the 2nd bag net having coarse mesh size. On the contrary, when the incidentally caught small-sized fish is fish species with big catch and has high commercial value relative to the resource value, these fish species are also landed to increase the landed quantity.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a stationary net, and more particularly to the structure of a fish catching part of a box net that finally drives the fish in the net.

[0002]

2. Description of the Related Art A stationary net is, as shown in FIG. 5, an opening portion (fish introduction portion) of a large main net 1 forming a so-called playing field.
From the rising net portion 3 of the main net to one side or a plurality of box nets 6, 7 via funnel-shaped passages 4, 5 to prevent fish from returning from the rising net portion 3 of the main net. Is connected, and a fish catching section 8 is provided at the innermost side of the box net 7 for finally driving the fish and landing.

As the name implies, a set net is placed in the sea,
The moving net of the migrating fish 15 is blocked by the fence net 2 and the habit of the fish is used to guide the school of fish along the fence net 2 into the main net 1 so that the fish migrating within the main net 1 gradually form a box net. 6 and 7, and when appropriate, the box net 7 provided with the fish catching section 8 is lifted from the front side to drive the fish in the box net 7 into the fish catching section 8 and finally the fish catching section 8 is landed. By catching fish.

[0004] When the set net is rich in large migratory fish resources such as yellowtail, tuna and salmon, the mesh size of the net of the fish catching section 8 is relatively large, and only adult fish of the target fish species are caught.
There were few bycatch of fry and other fish, and there were few problems in protecting fishery resources. However, with the decrease in the large migratory fish resources, the mesh size of the fish catching section 8 of the set net gradually became finer,
All schools of fish that have migrated to the fishing grounds have been targeted for fishing. Therefore, depending on the time of migration of the fish, large-sized migratory fish and their fry and small multi-captive fish such as sardines and horse mackerels have been bycatch.

The fish catching section 8 of a general stationary net that is currently used uses a finer and thicker thread than the mesh of the net (the part other than the fish catching section) of the second box net 7. Therefore, all the fish driven into the fish catching section 8 from the second box net 7 are scooped from the sea regardless of their size.

[0006]

However, according to the current fishing methods as described above, fish having a high resource value, for example, fry of salmon after hatching and release, are bycatch together with adult fish and sardines. A big problem arises in the protection of resources. In order to protect fisheries resources, it is partly done to select large migratory fish, such as juveniles, from among the fish scooped from the sea and return them to the sea, but once fried, the fish is severely damaged. In addition, since the selection cannot be done in a short time, fry fish, which are important for resource conservation, are generally caught as they are, and in fact, small fish with no market value are treated in the same way as discarded. is there.

[0007] Therefore, an object of the present invention is to obtain a fixed net having a structure capable of selecting and releasing small fry fish having a high resource value and a relatively low market value without landing.

[0008]

The stationary net of the present invention is further provided with a bag-shaped second fish through a fastener 13 that can be opened and closed on the inner side of the fish catching portion 8 of the box net 7 that finally drives in the fish to be caught. It is characterized in that the catches 12 are provided in series and the mesh size of the second fish catching part 12 is larger than that of the fish catching part 8 of the box net.

[0009]

The operation of placing the fixed net having the above structure in the sea and the net-fishing operation are performed in the same manner as in the prior art, but before the fish catching portion 8 of the second box net 7 is completely landed, the type of fish in the net is changed. Scrutinize,
When a large number of large-sized migratory fish with high resource value are mixed, the fastener 13 is opened. When the fastener 13 is opened, the fish driven into the fish catching section 8 is further moved to the second fish catching section 1
However, since the mesh size of the second fish catching part 12 is increased at this time, small fish fish are discharged into the sea through the mesh and the second fish catching part 12 Only the large fish that cannot pass through the nets are landed.

On the other hand, when the fish in the net are small, multi-catch fish such as sardines and horse mackerels, the fastener 13 is not opened and the fish catching part (first fish catching part) 8 of the second box net is opened. Land as it is.

That is, in the set net of the present invention, the type of fish in the net is discriminated before the fish in the net are once scooped from the sea, and fry of large migratory fish having a relatively high resource value compared to the market value is obtained. It releases these larvae from the sea without scooping when they are mixed in large quantities, and when small fish that are bycatch are polyfishes that have a relatively high market value relative to their resource value, these Fish is also caught and caught a lot with the large migratory fish that are the target of catching.

[0012]

1 to 4 show the essential parts of a stationary net according to the present invention. The fish catching part 8 (conventional fish catching part) 8 of the second box net 7 is provided in the shape of a bag (see FIGS. 1 and 2) connected to the opening 11 at the rear end of the box net. The second fish catching portion 12 according to the present invention is the first fish catching portion which is conventionally provided.
The fish catching portion 8 is further connected to the back through a fastener 13 that can be opened and closed. Usually, it is installed in the sea with the fastener 13 closed.

3 and 4 show the net-lifting operation of the stationary net of the present invention. For net-fishing, the boat 14 is moved from the front side of the second box net 7 to the back side of the second box net 7, and the fish 15 is driven toward the fish catching section 8 (FIG. 3 (a)). Further, the fish 15 is collected in the fish catching section 8 while the box net 7 is pulled up by the ship 14 in sequence (Fig. (B)). Then, as shown in FIGS. 3 (c) and 4, the type of fish in the fish catching section 8 is discriminated with the second box net 7 squeezed, and a large number of large migratory fish larvae with high resource value are mixed in the net. When it is, the fastener 13 is opened so that the second fish catching section 12 is communicated with the first fish catching section 8 and the fish 15 is further driven into the second fish catching section 12.

Since the second fish catching section 12 has a larger mesh size than the first fish catching section 8 as described above, among the fish driven into the second fish catching section 12, the fish having a smaller fish body is the second. Fish catching section 1
It is released into the sea through the mesh of 2. Therefore, by discriminating the type of fish in the net and opening the fastener 13, large-sized migratory fish, which are high in resource value, are released into the sea without being scooped from the sea, and only the large fish can be landed. . Further, when the fish in the net are large migratory fish and multi-fishing fish such as sardines and horse mackerels, the fish is driven into the first fish catching section 8 without opening the fastener 13 and the first fish catching section 8 is landed. .

[0015]

EFFECTS OF THE INVENTION According to the set net of the present invention described above, small fish, which have a higher resource value than the market value, are returned from the sea to the sea without being scooped, and future depletion of fishery resources is possible. It can be prevented as much as possible. In addition, if small bycatch fish with a low resource value, sardines, horse mackerels, etc. can be landed together with the target large migratory fish, etc., and a reduction in catch can be avoided as much as possible. it can.

[Brief description of drawings]

FIG. 1 is a schematic perspective view of a main part of a stationary net according to an embodiment.

FIG. 2 is a side view of the same.

FIG. 3 is an explanatory diagram schematically showing a net-fried operation.

FIG. 4 is a perspective view showing a state in which a fastener is opened during the net fishing.

FIG. 5 is a perspective view of the entire stationary net.

[Explanation of symbols]

 7 Box net 8 Fish catch of traditional box net 12 Second fish catch 13 Fastener

Claims (1)

[Claims] 1. A fish catching part of a box net (7) for driving in fish to be caught.
A bag-shaped second fish catching part (12) is connected to the back side of the (8) via an openable fastener (13).
A set net, characterized in that the net mesh of is larger than that of the fish catching part (8) of the box net.