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Entering behavior and fishing efficiency of common octopus, Octopus minor to cylindric trap

통발에 대한 낙지의 입망 행동과 어획성능

  • Park, Seong-Wook (Fisheries resources management and enhacement team, West Sea Fisheries Research Institute, National Fisheries Research and Development Institute) ;
  • Kim, Hyun-Young (Fisheries resources management and enhacement team, West Sea Fisheries Research Institute, National Fisheries Research and Development Institute) ;
  • Cho, Sam-Kwang (Fisheries resources management and enhacement team, West Sea Fisheries Research Institute, National Fisheries Research and Development Institute)
  • 박성욱 (국립수산과학원 서해수산연구소 자원관리조성팀) ;
  • 김현영 (국립수산과학원 서해수산연구소 자원관리조성팀) ;
  • 조삼광 (국립수산과학원 서해수산연구소 자원관리조성팀)
  • Published : 2006.02.28

Abstract

The behavior patterns of common octopus, Octopus minor to a cylindric trap were examined in the water tank using a video camera in order to know entering mechanism to the trap and to improve it. Fishing efficiency by 2 kinds of traps(A: 3 entrances, B: 2 entrances) was investigated in the coastal area of Deugryang Bay from May to July, 2005. Common octopus tends to approach by swimming more than walking towards trap. When they approached to the trap, they showed much more behaviors that sate at the around than upper part of it. Approaching behaviors of common octopus was more vigorous at nighttime than daytime on the trap, they showed the most vigorous action between 2 am and 4 am of the day. The rate of staying 30 seconds over around the trap was 41.5% in the nighttime. CPUE(g/trap) of common octopus caught by A type trap was 21.4% higher than the B type trap but there was no difference on the significance level of 5% by the ANOVA. Catch rate of common octopus and by-catch species caught by the A type trap were 97.2%, three and 98.7%, two for B type trap, respectively.

Keywords

Common octopus behaviour;Trap;Catching efficiency

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