| 摘要 |
PROBLEM TO BE SOLVED: To obtain a bottom trap net designed to obviate such a conventional drawback that a fishnet is deformed due to tidal current resulting in fishes' not entering the fishnet. SOLUTION: This bottom trap net is obtained through such a design and scheme that, in a net made by integrating a box net 1 with a funnel net 2, a bag net 3, a barrier net 4, a wing net 5, a float net 6 and a sinker line 7, a semicircular band plate 8 is provided with a groove to be threaded with a rope 9 and an elliptical bore 10, the rim of the plate 8 is designed to be of planar wedge type 11, the rope is hooked on a flexible plastic: joint plate 12 and the bore 13 of the band plate and stretched bow-fashion, to make a band plate pole and a beam which are then assembled with the net together into a round pole-, aspherical- or semicylindrical-shaped cubic skeleton box net; the end of the funnel net is fixed to the bore 13, a frontage net 14 is drawn together with the band plate and the joint plate and raised in a semicircular fashion; the barrier net is made triangular 15, and by raising the intermediate portion between the float net and the sinker line, the barrier net is attached squarely even to the slightly deformable bag net, thereby widening the interior of the net and the box net and the bag net can be set up apart from the bottom of the sea; an air tank 17 made of rubber cloth and equipped with a hose 16 is attached to the lower part of the box net, air is then fed from a ship to lift the box net, etc.; the bow-shaped band plate and joint plate is made aspherical, the rope is stretched around, sea algae are attached thereto, the float net and the barrier net are stretched, thus the whole net is fixed, thereby affording a fishbank combinedly bearing anchorage function, thus obtaining the aimed bottom trap net capable of luring fishes.
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