통발에 대한 낙지의 입망행동과 어획성능
Entering behavior and fishing efficiency of common octopus, Octopus minor to cylindric trap
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초록
통발에 대한 낙지의 입망 과정을 알아내고, 통발을 개량하기 위하여 수조에서 통발에 대한 낙지의 행동패턴을 비디오카메라로 관찰 조사하였다. 통발의 누두망 개수에 따른 어획성능 시험은 2005년 5월부터 7월까지 전남 득량만에서 수행하였다. 통발에 대한 낙지의 접근행동은 걷는 행동에 비해 유영하는 행동이 많았으며, 유영하여 통발에 접근할 때에는 통발의 상면 보다 주위에 안착하는 행동이 많았다. 낙지는 주간보다 야간에 활발한 행동을 보였으며, 02:00～04:00시에 가장 활발한 행동을 보였고, 야간에 통발 주위에 30초 이상 체류하는 비율은 41.5%였다. A형 통발에서 어획된 낙지의 CPUE는 B형 통발에 비해 21.4% 많았으나 이를 분산분석으로 검정한 결과 5% 유의수준에서 차이를 보이지 않았다(p〈0.05). A형과 B형의 통발당 낙지의 어획률은 각각 97.2%, 98.7%였으며, A형과 B형 통발에서 어획된 혼획 종수는 각각 3종, 2종이었다.
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.
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