동해안 자망에 대한 고무꺽정이 (Dasycottus setiger)의 망목 선택성
Size selectivity of the gill net for spinyhead sculpin,Dasycottus setiger in the eastern coastal waters of Korea
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초록
본 연구에서는 2002년 6월부터 2004년 11월 사이에 동해안 울진 연안에서 망목크기가 다른 저층 자망에 어획된 고무꺽정이의 어획 자료를 사용하여 망목선택성을 추정하였다. 시험 자망에 어획된 어획물은 대구 (36.2%), 고무꺽정이 (31.0%), 기름가자미 (13.5%) 등이었다. 자망에 대한 고무꺽정이의 망목 선택성 곡선으로 정규분포함수, 대수정규분포함수, 이봉성정규분포함수를 사용하였다. 망목 선택성을 표현하는 각 함수의 파라미터, 상대어획강도 등은 SELECT 모델을 적용하여 최우법으로 추정하였다. 망목선택성을 표현하는 모델의 적합도는 AIC를 산정하여 비교하였다. 자망에 대한 고무꺽정이의 망목선택성 곡선으로 상대어획강도 가 일정하다고 가정한 이봉성정규분포함수가 채택되었다. 선택률 1.0을 나타내는 최적 상대 전장 (optimum relative total length) 및 50%선택범위는 각각 2.363 및 0.851로 추정되었다.선택률 1.0을 나타내는 최적 전장에서 망목내주(P)에 대한 체동주(G)의 비율(G/P)은 0.86-0.87을 나타내었다.
Abstract
Spinyhead sculpin Dasycottus setiger, a species of cold water fish, is distributed along the eastern coastal waters of Korea. A series of fishing experiments was carried out in the waters near Uljin from June, 2002 to November, 2004, using the experimental monofilament gill nets of different mesh sizes (82.2, 89.4, 104.8, and 120.2 ㎜) to describe the selectivity of the gill net for the fish. The SELECT (Share Each Length’s Catch Total) analysis with maximum likelihood method was applied to fit the different functional models (normal, lognormal, and bi-normal models) for selection curves to the catch data. The bi-normal model with the fixed relative fishing intensity was selected as the best-fit selection curve by AIC (Akaike’s Information Criterion) comparison. For the best-fit selection curve, the optimum relative length (the ratio of fish total length to mesh size) with the maximum efficiency and the selection range ( ) of 50% retention were obtained as 2.363 and 0.851, respectively. The ratios of body girth to mesh perimeter at 100% retention where the selection curve of each mesh size represented the optimum total length were calculated as the range of 0.86~0.87.
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