ISSN : 1225-3480
조사기간 동안 오분자기류의 각장조성은 2004년 이후 소형개체의 어획비율이 증가하였고, 연도별로 어획개시연령(<TEX>$t_c$</TEX>) 및 순간어획사망계수(F)를 추정한 결과, <TEX>$t_c$</TEX>r는 2006년에 1.926세로 2004년에 비해 약 0.09세 낮아진 반면, F는 2006년에 1.088/year로 2004년에 0.574/year보다 크게 높았다. 가입당생산량(Yield-per-recruit)모델을 사용하여 <TEX>$t_c$</TEX>와 F의 변화를 연도별로 조사한 결과, 2004년의 경우 현재의 F값인 0.574/year을 유지하면서 <TEX>$t_c$</TEX>를 2.7세로 높이거나, 현재의 <TEX>$t_c$</TEX>값인 2.01 세에서 F를 0.800/year로 높이면 최대 가입당생산량을 얻을 수 있었고, 2005년의 경우 현재의 F값인 0.578/year에서 <TEX>$t_c$</TEX>를 2.5세로 높이거나, 현재의 <TEX>$t_c$</TEX>값인 1.946세에서 F를 0.880/year으로 높일 때 최대의 가입당생산량을 얻을 수 있었다. 반면, 2006년의 경우 현재의 F값인 1.088/fear에서 <TEX>$t_c$</TEX>를 3.1세로 높이거나, 현재의 <TEX>$t_c$</TEX>값인 1.926세에서 F를 0.810/year로 낮추면 최대 가입당생산량을 얻을 수 있었다. 또한, 연도별 <TEX>$F_{0.1}$</TEX>와 <TEX>$F_{MAX}$</TEX>를 추정해 본 결과, 2004년과 2005년에 비해 2006년에 추정된 <TEX>$F_{0.1}$</TEX>(0.427/year)과 <TEX>$F_{MAX}$</TEX>(0.804/year) 모두 현재의 F(1.088/year) 보다 낮게 나타났다. 따라서, 이들 결과를 종합해보면 2006년에 들어 성장남획의 징후는 뚜렷하였고, F와 관련된 조업 해녀수의 인위적 감소는 힘들기 때문에 <TEX>$t_c$</TEX>를 3.1세(각장 4.2 cm) 로 높이는 방안을 강구해야 할 것으로 판단되었다.
We studied the management policy for Haliotis diversicolor fisheries in the coastal area of Sungsanpo using Yield-per-recruit model from 2004 to 2006. The age at first capture (tc) and fishing mortality (F) annually estimated during the study period decreased and increased, respectively. The maximum yield-per-recruit in 2004 was increased by increasing tc from the 2.012 year of current tc to 2.7 year or increasing F from the 0.574/year of current F to 0.800/year, and that in 2005 was increased by increasing tc from the 1.946 year of current tc to 2.5 year or increasing F from the 0.578/year of current F to 0.880/year. In 2006, the maximum yield-per-recruit was increased by increasing tc from the 1.926year of current tc to 3.1year or decreasing F from the 1.088/year of current F to 0.810/year. Further, although the current F in 2004 and 2005 was lower than the estimated FMAX, that in 2006 was higher than the estimated FMAX. These results indicate that the likelihood of growth overfishing with increasing catch of smaller H. diversicolor in 2006 was greater than in 2004 and 2005. As action that could prevent growth overfishing in fisheries management of H. diversicolor, increasing for the current tc could be a more appropriate policy because the artificial decrease of the number of woman divers related F is actually difficult.
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