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The development and the characteristics of environmentfriendly sinker for octopus drift-line

문어흘림낚시용 친환경 봇돌의 개발과 그 특성

  • An, Young-Il (Dept. of marine police and Technology, Gangwon Provincial College) ;
  • Yoon, Sang-Ok (Dept. of Ceramics Engineering, Kangnung National University)
  • 안영일 (강원도립대학 해양경찰과) ;
  • 윤상옥 (강릉대학교 세라믹공학과)
  • Published : 2008.08.29

Abstract

For environment-friendly fishery, the lead sinkers of octopus drift line were developed with the environmentfriendly sinker, and their characteristics and performance were investigated. To make the environmentfriendly sinker, the hydrate ceramic material was developed, and to increase the weight and strength, the iron power was added to it. The fishing hook was machine-made, and standardized, by using 60cm iron wire. For the manufacture of the sinker, the first, the mold was made, and then, hydrate ceramic material and water were quantitatively mixed. The mixture was poured into the mold prepared with a fishing hook already inserted, and had hardened for several hour, before it was taken out of the mold as a complete sinker. The sinkers were made in the 8 types ranging in weight from 150 to 500g, and their specific gravities were diverse from 2.871 to 6.637, which was 0.19 to 0.44 times lower than that of lead. The movement of the environment-friendly sinker by flume tank was possible in the weaker current speed than the similar lead sinker. In the coastal fishing grounds of Gangwon province, the comparison of catching efficiency was made between the improved fishing gears composed of the environment-friendly sinkers and artificial baits, and the current used fishing gears of lead sinkers and pig-fat baits. The result showed the tendency in which the improved fishing gears caught the bigger octopuses than the current used fishing gears. In the quantity and number of the fish catch per unit fishing gear, the improved fishing gear showed a little more catch than the current used fishing gear, regardless of the fishing area. However, the number of the improved fishing gears lost during fishing operation was similar to that of the current used fishing gears.

Keywords

Octopus drift-line;Environment-friendly sinker;Catching efficiency

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Cited by

  1. Color effect of the environment-friendly sinker for octopus drift-line vol.45, pp.3, 2009, https://doi.org/10.3796/KSFT.2009.45.3.144