JP4756151B2 - Side towing trawl system - Google Patents

Description

[0001]
BACKGROUND OF THE INVENTION
The present invention relates to a side towing trawl system that deflects a trawl net from the stern to a side surface to trawl the trawl net.
[0002]
[Prior art and problems to be solved by the invention]
In general, trolling of the survey water area using a trawl network is carried out as a technique for surveying fishery resources.
[0003]
Conventionally, as shown in FIG. 4, for example, a fry fish swimming in the surface layer of the survey water area by trawling the trawl net 4 from the stern A of the stern A of the survey ship 1 via the trawl cable 2 and the bridle 3. I tried to capture the sample.
[0004]
However, in this conventional fishery resource survey method, since the trawl net 4 is seized along the track of the research vessel 1, fry fish and the like escape from the screw flow along the track, so an accurate survey is performed. It was impossible. Furthermore, since the bridle 3 arranged immediately upstream of the trawl net 4 threatens fleeing fish and the like to escape, it is impossible to conduct an accurate survey as described above.
[0005]
The present invention has been made in view of these points, and can directly open the front opening without any obstacles at a position off the ship's wake, and can trawl the trawl, and does not escape fish and the like. An object is to provide a side towing trawl system that can be captured in a state.
[0006]
[Means for Solving the Problems]
In order to achieve the above object, a side towing trawl system according to the present invention includes a deflection deploying means for deflecting a trawl cable fed from the stern sideways with respect to the traveling direction of the stern, And a trawl net that is mounted with the front opening directly open without any obstacles between the means and the means. According to the present invention, the deflection deploying means deflects the seine cable and the trawl to the side with respect to the advancing direction of the stern, and the trawl directly opens the front opening without any obstacles. The front opening can be directly opened without any obstacles at a position deviated from the position, and the trawl net can be seized to catch fish and the like without escaping.
[0007]
DETAILED DESCRIPTION OF THE INVENTION
Hereinafter, embodiments of the present invention will be described with reference to FIGS.
[0008]
1 to 3 show an embodiment of the present invention.
[0009]
As shown in FIGS. 1 and 2, the side towing trawl system of the present invention is deflected laterally with respect to the traveling direction of the stern A at the downstream end of the seine cable 12 fed from the stern A of the stern of the ship 11. A deflection deployment means 13 is provided, and a trawl net 14 is attached between the stern A of the cable net 12 and the deflection deployment means 13, and the front opening 15 of the trawl net 14 is directly opened without any obstacles. Has been.
[0010]
As will be further described with reference to FIG. 3, the trawl 14 is formed by connecting a bag-like body net 17 to a rectangular rigid net frame 16 made of metal or reinforced plastic, and the rigid net frame 16 forms a front opening 15. is doing. In order to connect the trawl net 14 to the cable net 12, an adjustment net 18 having a substantially triangular planar shape is coupled from the upper side, the upstream side side, and the lower side of the rigid net frame 16 toward the front. The swivel 20 attached to the end of the towing cable 19 forming the sash net 12 and the upper and lower ends of the adjustment net 18 are connected by a towing bridle 21 and a towing chain 22, respectively. Further, in order to adjust the water depth of the trawl net 14, a plurality of floats 23 having different sizes are fixed to the upper side portions of the rigid net frame 16 and the adjustment net 18, and a weight is formed on the entire lower side portion of the adjustment net 18. The ground chain 24 is fixed.
[0011]
The deflecting and deploying means 13 is formed by joining an outer kite 26 made of a canvas and having a substantially W-shaped longitudinal cross section to an inner kite frame 25 made of metal or reinforced plastic and having a substantially “day” shape. . The outer kite 26 is formed so that the W shape of the front side portion of the inner kite frame 25 is the maximum shape, and the W shape is gradually reduced so that the rear side portion of the inner kite frame 25 becomes flat. Yes. In order to adjust the water depth of the deflecting and deploying means 13, a plurality of floats 27 having different sizes are fixed to the upper side portion of the inner kite frame 25 and the upper surface portion of the outer kite 26, and the lower corners of two locations of the inner kite frame 25 are fixed. The weights 28 are fixed to the lower portion of the outer kite 26 and the outer kite 26, respectively.
[0012]
A towing bridle 29 and a towing chain 30 serving as the seine cable 12 are connected from the downstream upper corner of the rigid net frame 16 of the trawl net 14, and the swivel 31 attached to these downstream ends and the upper and lower sides of the inner kite frame 25 are connected to each other. The four corners are connected with towing bridles 32, respectively.
[0013]
Next, the operation of this embodiment will be described.
[0014]
In the case of using the side towing trawl system trawl in this embodiment, the deflecting and deploying means 13, the trawl net 14 and the trawl net 12 are introduced in order from the stern of the ship 11 to the survey water area, and the trawl net 12 of a predetermined length from the stern A. When extended, a water flow acts on the inner surface of the outer kite 26 of the deflection deployment means 13 to generate an outward deployment force, and the deflection deployment means 13, the trawl net 14, and the trawl net 12 are moved with respect to the advancing direction of the stern A. Further, the trawl net 14 is held in a state where the front opening 15 is directly opened without any obstacles. Further, the trawl net 14 and the deflecting and deploying means 13 are held at a predetermined depth by the float 23 and the ground chain 24 and the float 27 and the weight 28. As a result, the front opening 15 can be directly opened without any obstacles at a position deviated from the wake of the ship 11, and the trawl net 14 can be trapped to catch fish and the like without escaping. Therefore, when the side towing trawl system of the present embodiment is used for the fishery resource survey for capturing fry and the like, the fry and the like can be captured without any escape and an accurate survey can be performed. When catching is finished, the side towing trawl system should be lifted in the reverse order of the above input.
[0015]
In the above-described embodiment, the deflecting / deploying means 13 is provided separately from the trawl net 14, but the deflecting / deploying means 13 is trawled by fixing only the outer kite 26 to the downstream side surface of the trawl net 14. It may be provided integrally with the net 14.
[0016]
In addition, this invention is not limited to the said embodiment, It can change as needed.
[0017]
【The invention's effect】
Since the side towing trawl system of the present invention is constructed and operates in this way, the deflection deploying means deflects the trawl cable and the trawl net laterally with respect to the stern traveling direction, and the trawl net opens to the front surface. Since it is opened directly without any obstacles, the front opening is opened directly without any obstacles at a position outside the ship's wake, and the trawl net is seized to catch fish etc. without escaping. It is possible to achieve such an effect.
[Brief description of the drawings]
FIG. 1 is a plan view showing an embodiment of a side towing trawl system according to the present invention. FIG. 2 is a front view showing an embodiment of the side towing trawl system according to the present invention. FIG. 4 is an enlarged perspective view showing one embodiment. FIG. 4 is a plan view showing a trawl method in the case of conducting a conventional fishery resource survey.
DESCRIPTION OF SYMBOLS 11 Ship 12 Seismic cord 13 Deflection expansion means 14 Troll net 15 Front opening

Claims (1)

Deflection deploying means for deflecting the trawl cable fed from the stern sideways with respect to the advancing direction of the stern A side towing trawl system comprising: a trawl net that is attached to the trawl.

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