SU935046A1 - Apparatus for directing fish to trawl catching zone - Google Patents

Description

(5) DEVICE FOR DIRECTION OF FISH IN THE ZONE

TRALA CLOSE

one

The invention relates to industrial fisheries, namely, devices for directing fish to the trawl fishing zone.

A device for directing fish to the trawl catch zone is known, comprising flexible transverse frames mounted on cables up to the mouth of the net bag on the trawl door side and equipped with means for influencing the fish with spacer shields and paint tanks l.

The known device is not sufficiently effective due to the fact that it is intended only to scare the fish away from the spacer shields and the volumes painted with aq.

The aim of the invention is to increase the efficiency of fishing.

The goal is achieved by the fact that in the device for directing fish to the trawl fishing zone, containing flexible transverse frames mounted on cables up to the mouth of the net bag from the side of the trawl boards and equipped with means for influencing the fish, there is an additional frame with means for influencing the fish It is located in the zone of maximum opening of cables, mainly on trawl boards.

FIG. 1 shows a side view of the device; in fig. 2 - the same view

10 front down the trawl.

The device comprises a trawl 1 with a net bag 2, upper cables 3, lower cables k, trawl boards 5, warps 6, floats 7, weights B and weights depressor 9. Trawl 1 contains removable transverse frames 10 and 11 made of rope. Upper frame

10 secured on trawl boards 5

and equipped with floats 7 Lower frame

70

11 is connected with lateral straps 12 fixed on trawl boards 5. On frame 11, weights 8 are installed, with heavier loads being installed.

They are closer to the straps 12 and the trawl boards 5. The frames 10 and 11 and the straps 12 are equipped with means for influencing the fish — sound emitters 13, such as speakers, and emitters AND electrical signals. The emitters 13 and 14 are connected by wires with a source of biologically significant signals, mounted on the trawl 1,

The device works as follows.

During the towing of the trawl 1, the frames 10 and 11 and the protrusions 12 form a false mouth of the trawl 1 consisting of two half-rings, located slightly behind the trawl boards 5 at angles to the direction of towing the trawl. These ANGLES depend on the correlation of forces: resistance to movement in water of frames 10 and 11 and weight of cargo 8 and float 7. Angles at any ratio of the above forces are greater than O and less than EO, which ensures the formation of a false wellhead 1 with an area substantially different from the area of the mouth of the trawl. During towing of a trawl 1 radiators 13 and I send biologically significant signals to water. The sounds of feeding the fish of the species being harvested spread over large distances from trawl 1 and attract fish to it. Electric currents carrying signals of danger to fish of the species being fished scare the fish to the zone of catch when approaching the false mouth of the trawl 1. Frames 10 and 11 and straps 12 are put on trawl boards 5 when the trawl is launched into the water and removed when sampling from the water .

Such an embodiment of the trawl can significantly improve the efficiency of fishing.

Claims (1)

1. USSR author's certificate ff 376071, cl. And 01 K 73/02, 1971 (prototype).