The Characteristics of the F ishing Tackle Line in Yellow-tail Troll Fishing

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  • ブリ類のひきなわ釣に使用する“びしなわ”漁具の沈降の特性について
  • ブリルイ ノ ヒキ ナ ワ ツリ ニ シヨウスル ビシ ナ ワ ギョグ ノ チ

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Abstract

The fishing tackle line called “Bishi line” is used in the trolling of yellow-tail and consists of numerous ellipsoidal lead sinkers attached to mono-filament nylon of 50m in length.<br> In this study, eleven types of lines with different size and number of sinkers were observed, in order to examine the characteristics of the line in water at the trolling sppeed of 2.5, 3.0 and 3.5 knots respectively, and the results obtained are as follows:<br> 1) The line is extended out tautly when the value of b/a lies between 3.5 and 9, where b is the length of the interval between two sinkers and a the length of the vertical axis of sinker.<br> 2) The total hydraulic force Sθ acting on the line is shown as the sum of the force Sθ' acting on the sinkers and the force k • Sθ", corrected for hydraulic interference by using a correction coefficient k acting on the mono-filament.<br> 3) The error margin between the measured and calculated values of the depth or tension of the lines is less than 5%.<br> 4) A graph showing the relation betweent the depths of lines and number of sinkers is obtained for practical use.

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