RU63173U1 - SORTING SYSTEM FOR TRAILING OUT OF NON-INDUSTRIAL FISHING OBJECTS - Google Patents

Abstract

A sorting system for discharging non-fishing fishing objects from a trawl is disclosed, comprising a net insert section, a selective inclined grating and an exhaust window for non-fishing fishing objects. It differs from the known ones in that the selective inclined lattice is oval in shape and contains longitudinal and transverse ties of ropes with pipe sections strung on them, and the mesh section-insert is made of delhi with a square mesh shape and with an outlet window in its lower part. The inventive sorting system is simple in design, does not require large costs for its manufacture, provides an improvement in its hydrodynamic characteristics and the prevention of inappropriate by-catch. 1 n.p. f-ly, 3 ill.

Description

A useful model is claimed - a sorting system to prevent by-catch of adult individuals of pollock, cod, perch and other fish species when fishing for blue whiting, herring, mackerel, pollock and other mass fish species with deep trawls.

Known sorting device for fishing trawl (RF patent No. 2101946 from 04/14/92), designed for the release of small fishing objects from the trawl. It includes the main sorting grate, made in the form of a frame with an inclination forward with rods attached to it, extending half the distance of the trawl from its upper part to the bottom, a delay section and an additional sorting grating. The delay section is made of dense canvas or polyvinyl chloride material. Metal grilles create significant inconvenience due to cumbersome construction, especially with strong sea waves. During trawling, such a system causes additional resistance and presses the trawl bag to the ground, which creates the prerequisites for emergency situations.

Known trawl for fishing shrimp according to the description of the invention to the author's certificate of the USSR No. 1542506 from 12.15.87, made with an inclined fence for fish. The purpose of the trawl is to ensure compliance with the rules of conventional fishing to exclude by-catch of fish from the shrimp fishery. An inclined net selective fence is attached to the catching part in front of the upper bag and has a larger mesh than the trawl mesh. The lower bag is equipped with an inclined plate cantilevered on the upper wall of the front of this bag with the formation of a gap between the inclined plate and its bottom. The holes for the release of fish are made in the upper part of this bag behind an inclined plate and are formed by longitudinal ropes. The disadvantages of this selective fence

is poor filtration due to the usual mesh shape, as a result of which a large hydrodynamic backwater impedes the entry of fish and shrimp into the trawl, which increases the trawl time for catching the school, as well as injuring fish of non-commercial size.

Closest to the claimed is a selective device for the release from the trawl of a fishing object of non-commercial size (RF patent No. 2170506 dated 01/05/98), designed for the release of small objects of fishing from the trawl. The device comprises a net section-insert, a U-shaped dividing wall formed by a selective element and a guiding element, an element directing the fish to the selective element of the dividing wall, a passage and an outlet. The selective element contains a base frame, a set of removable selective gratings and a device for fixing the selective grate to the base frame, and due to this original design it can be made of lighter and cheaper materials. At the same time, to increase the efficiency of sorting objects of non-commercial size, the device can additionally be equipped with a net selective insert from a mirror mesh with an additional element directing the filled object to it. An outlet is made in the upper part of the net section-insert between the elements of the separation insert. This device is difficult to manufacture, but its hydrodynamic characteristics are higher than that of the prototype - the sorting system "Sort-X" of the Norwegian company AO "SELFI".

The inventive sorting system, as well as known, contains a net section-insert of the trawl, a selective inclined grate and an outlet window for non-fishing fishing objects.

The problem solved in the development of this utility model was to create a simple sorting system that ensures compliance with fishing rules when catching large species of fish, in particular blue whiting, herring, mackerel, excluding by-catch of large fish, namely, adult pollock, cod, and perch and other types of fish.

The technical result consists in simplifying the design of the sorting system, reducing the cost of its manufacture, improving its hydrodynamic characteristics and preventing injury to the fish.

The technical result is achieved by the fact that the selective inclined lattice is oval in shape and contains longitudinal and transverse ties of ropes with pipe sections strung on them, and the mesh section-insert is made of delhi with a square mesh shape and an outlet window in its lower part.

The implementation of a selective oblique lattice of an oval shape of a “soft” type, containing longitudinal and transverse connections from ropes with pipe sections strung on them, simplifies the design of the lattice, reduces its weight, reduces additional resistance when trawling, prevents fish injuries, prevents the trawl bag from being twisted when towing and turning the ship in the opposite direction. This together improves the hydrodynamic characteristics of the selective system, prevents emergency situations, and improves the efficiency of sorting by-catch.

The implementation of a mesh section-insert from a delhi with a square mesh shape and an outlet window in its lower part reduces drag during trawling, reduces hydrodynamic backwater, which increases trawling efficiency and ensures uniform fish yield, as well as prevents its injury compared to using only a selective grating. In addition, when using a square mesh, the net section has a more regular cylindrical shape and an open mesh during fishing, which provides better system selectivity.

The inventive utility model is illustrated using the drawings, where Fig. 1 is a side view of a sorting system, Fig. 2 is a general view of a selective grating, and Fig. 3 is a view A of Fig. 2.

The sorting system (see Fig. 1) comprises a net section-insert 1, a selective grid 2 and an outlet window 3. The net section-insert 1 is made of

Delhi with a square mesh shape, the exhaust window 3 is located in its lower part. Selective grille 2 is installed in the insert section 1 with an inclination at an angle of 45 to 60 °. Selective lattice 2 (see FIG. 2) is oval and contains (see FIG. 3) longitudinal cable ties 4 and transverse cable ties 5 with pipe sections 6 strung on them of various lengths. Pipe sections 6 provide an outlet for non-commercial fish species and prevent their injuries. In this case, the length of the transverse tubes is selected from the calculation of the minimum distance between the longitudinal tubes y providing a normal passage of commercial fish species into the pile and prevention of non-commercial fish species. The length of the longitudinal tubes, approximately 5-6 times longer than the transverse ones, is selected from the conditions for ensuring a decrease in resistance and strength characteristics of the sorting system.

Using the utility model is as follows.

In the process of trawling, the fish is fed by water flow to the selective grating 2. The main part of the caught fish (small size) passes in the upper part of the grating 2 between the longitudinal ties 4. Large fish, avoiding encountering an obstacle in the form of longitudinal ties 4 of the selective grating 2, goes down along the direction of the links 4 and then, not in contact with the lattice 2, leaves through the exhaust window 3 from the trawl. The blue whiting (herring, mackerel, etc.) is sifted out through the grate 2 and goes into the trawl bag 7. The size of the fish that is sifted out during fishing depends on the distance between the longitudinal ties 4 of the grate 2. Thus, large individuals of non-commercial fish species come out, which allows fishing for large species of fish (blue whiting, herring, mackerel) in areas where cod, haddock and perch are found without damage to their stocks and without injuries.

The inventive sorting system is simple in design, does not require large costs for its manufacture, provides an improvement in its hydrodynamic characteristics and the prevention of inappropriate by-catch.

Claims (1)

A sorting system for discharging non-commercial fishing objects from a trawl containing a net insert section, a selective inclined grating and an outlet window for non-fishing size fishing objects, characterized in that the selective inclined grating is oval and contains longitudinal and transverse ties from ropes strung on them pipe sections, and the net section-insert is made of delhi with a square mesh shape and with an outlet window in its lower part.