제주 연안 재래식 갈치 채낚기의 침지시간에 의한 조획률 및 미끼 탈락률

Abstract

This paper is to investigate the effect of the immersion time in the traditional hairtail hand line fordeveloping the fishing methods and the fishing gear in the coast of jeju. The operating of 32 times was madewith each different immersion time of hairtail hand line, and the relations between the catch and theimmersion time were examined. As the result, targeted species rate was over 98% of total catch. From about800 seconds after casting, the hooking rate was decreased and the bite loss rate was increased, it seems to bemade by the decreasing factors of predators including the cutting of branch lines etc. In addition, it wassupposed that the hooking rate and the bait loss rate had a deep connection with feeding time zone. The levelof the correlation coefficient of the bait loss rate according to the immersion time was 0.54 at p 0.01, in thecase of the hooking rate, 0.59 was chosen after about 800 seconds. The hooking rate and the bait loss rateaccording to the hook number were not irrelevant to the fish school layer. Additionally, it was assumed thatthe bait loss rate was related to the depth of water.Key words : Hairtail hand line, Hooking rate, Bait loss rate, Immersion time