Journal of the Korean Society of Fisheries and Ocean Technology (수산해양기술연구)
- Volume 31 Issue 3
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- Pages.240-246
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- 1995
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- 2671-9940(pISSN)
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- 2671-9924(eISSN)
Behaviour Studies of Red Till Fish, Branchiostegus Japonicus to a Longline Gear for Hook Design
연승어구에 대한 옥돔의 행동과 낚시형상 설계
- Lee, Chun-Woo (National Fisheries University of Pusan) ;
- Park, Seong-Wook (National Fisheries Research & Development Agency)
- Published : 1995.09.01
Abstract
The responses of red tile fish, Branchiostegus Japonicus to a longline gear were examined in an experimental tank using two video cameras, in order to know hooking mechanism and improve longline hook. In attraction stage, the fish swim to upstream direction slowly just above the bottom toward the baited hook. The majority of the fish then biting the bait incompletely, after the biting, the fish made a backward swimming with low intense, and the bait was usually spitting out when snood was stretched. In most case, hooking took place at the moment the fish made jerk or rush after the bait wallowed. The behaviour sequence closely related to hooking are chewing and jerking or chewing and rushing. According to the field experiments, the tested hooks of long shank show very low catching efficiency compared to the traditional hook with short shank, and the hooked position of the traditional hooks were oesophagus or stomach but the tested hooks were mouth in the most cases. For catching efficiency, desirable hook shape were inferenced inner-curved point and short shank because its ease to swallow. The shape and demensions of a porposed hook were determined in consideration of mechanized gear handling and hooking performance.
옥돔의 조획 기구를 알아내고, 낚시를 개량하기 위해서 수조 중에서 옥돔의 연승어구에 대해 반응 행동을 비디오 카메라로 관찰 조사하였다. 옥돔은 물살을 거슬르면서 해저 위를 천천히 유영하며 미끼에 접근하였고, 미끼를 물때에는 불완전하게 무는 경우가 많았으며, 미끼를 문 후에는 천천히 뒤로 유영하면서 아릿줄이 당겨지면 미끼를 내뱉는 등의 완만하고 주의 깊은 행동을 보였다. 대부분의 조획은 미끼를 깊이 삼킨 후에 옥돔이 Rush 또는 Jerk 행동을 할 때 되었고, 조획과 관계 깊은 행동연쇄는 Chewing
Keywords