반구형 통발에 대한 세고리물레고둥의 망목 선택성 연구
Size selectivity of the dome-shaped pot for whelk Buccinum opisthoplectum in the eastern coastal waters of Korea
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연안에 서식하는 어업 자원의 지속적 유효 이용을 위해서는 미성숙한 소형 개체의 혼획을 감소시키고 상품성 있는 개체만을 선택적으로 어획하는 것이 중요하다. 본 연구에서는 반구형 통발 (밑면 직경 58cm, 높이 37cm, 중량 700g)에 대한 세고리물레고둥의 망목 선택성을 추정하기 위하여 망목 크기가 다른 반구형 통발을 제작하여 2003년과 2004년의 8월과 9월 사이에 동해안 영일만 외측에서 시험 조업을 수행하였다. 통발의 망목 크기는 5종류 (m=17.1, 24.8, 35.3, 39.8, 48.3mm)를 사용하였다. 시험어구에 어획된 어종별 개체수 조성을 보면 세고리물레고둥 (Buccinum opisthoplectum)은 4,540마리 (45.4%)이었고, 물레고둥 (Buccinum striatissimum) 3,012마리(30.1%), 물렁가시붉은새우 (Pandalopsis japonica） 925마리 (9.3%), 대게 (Chionoecetes opilio) 893마리 (8.9%), 기타 127마리(1.3%)로 나타났다. 반구형 통발에 대한 세고리물레고둥의 망목 선택성 곡선 추정은 SELECT 모델을 적용하여 분석하였다. 시험조업 결과로부터 추정된 반구형 통발에 대한 세고리물레고둥의 망목 선택성 Master curve는 s (R)=exp (7.833R-10.871)/[1+exp (7.833R-10.871]로 추정되었으며 망목 크기가 증가할수록 소형 개체의 어획이 감소하는 것으로 나타났다. 또한 50%상대선택각고 R50은 1.388이고 선택범위 SR은 0.281이었다. 여기서 상대각고 은 망목 크기 (m)에 대한 각고 (l)의 비율을 나타낸다. 망목 선택성 결과로부터 반구형 통발의 망목 크기가 25, 35, 50, 60mm로 증가함에 따른 세고리물레고둥의 50%선택각고 ()는 각각 34.7, 48.6, 69.4, 83.3mm를 나타내었다. 금후, 세고리물레고둥의 지속적 이용과 관련하여 통발의 망목 선택성을 활용한 소형 개체 혼획 감소에 본 연구 결과가 활용되기를 기대한다.
Abstract
Fishing experiments were carried out in the adjacent sea of Yeongil Bay, the eastern cost of Korea from 2003 to 2004 using the dome-shaped pots with different five mesh sizes (17.1, 24.8, 35.3, 39.8, and 48.3mm) in order to determine the size selectivity of pots for the whelk, Buccinum opisthoplectum. The catch species were composed of Buccinum opisthoplectum (45.4%), Buccinum striatissimum (30.1%), Pandalopsis japonica (9.3%), Chionoecetes opilio (8.9%), and so on. The shell height (l) of Buccinum opisthoplectum caught in the experimental fishing pots was measured. The SELECT (Share Each Length’s Catch Total) analysis method was applied with fishing data to obtain master selection curve. The model with the estimated split parameter was found to fit the catch data best. The master selection curve was estimated to be s(R)=exp(7.833R-10.871)/[1+exp(7.833R-10.871], where R is the ratio of shell height to mesh size. The relative shell length for 50% retention was 1.388, and the selection range was 0.281. It means that the pots of larger mesh size allow more whelks of small size to escape.
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