PURPOSE: To provide a submerging tool for line-trawling medium and large-sized fishes such as yellowtails or bluefins and showing improved fish catch. ;CONSTITUTION: The main body 11 having the line connectors 13, 14 at its top and tail is equipped with two blades 21, 22, differing in their inclination angles on the back, thus the trawling depth of the fishing line cab be altered by changing the trawling direction at 180°. In particular, it can make zjg zag motion in the middle-deep trawling.;COPYRIGHT: (C)1995,JPO
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