우리나라 대형선망어업에서 어획된태평양참다랑어의 CPUE 표준화(2003-2016)
CPUE standardization of Pacific bluefin tuna caught by Korean offshore large purse seine fishery (2003-2016)
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초록
본 연구에서는 부산공동어시장과 무선국에서 수집한 2003-2016년간의 대형선망어업의 조업일자, 위치 (해구), 시간 (낮/밤), 노력량 (인망수) 및 어획량 (중량) 자료와 일반선형화모델 (Generalized Linear Model)을 사용하여 태평양 참다랑어에 대한 CPUE 표준화를 수행하였다. 표준화된 (standardized) CPUE는 2003년과 2010년을 제외하고, 2004부터 2011년까지 일정한 수준을 보였고, 그 이후 2014년까지 증가추세를 보였으나, 2015년에 다시 감소하였다. 그리고 GLM 분석 결과, 태평양 참다랑어의 일반 (nominal) CPUE에 가장 큰 영향을 미치는 요소는 참다랑어의 어획비율이었다.
Abstract
Pacific bluefin tuna (Thunnus orientalis) has been mostly caught by the Korean offshore large purse seine fishery in Korean waters. The annual catch of Pacific bluefin tuna caught by the offshore large purse seine fishery in Korean waters showed less than 1,000 mt until the 1990s except for 1997. The catch sharply increased to 2,401 mt in 2000 and recorded the highest of 2,601 mt in 2003, but the catch has generally decreased with a fluctuation thereafter. The main fishing ground of Pacific bluefin tuna of this fishery is formed around Jeju Island. However, it expanded to the Yellow Sea, the coastal of Busan, and the East Sea, which depends on the migration patterns of Pacific bluefin tuna by season. The CPUE standardization of Pacific bluefin tuna was conducted using Generalized Linear Model (GLM) to assess the proxy of the abundance index. The data used for the GLM were catch (weight), effort (number of hauls), catch ratio of Pacific bluefin tuna, moon phase by year, quarter and area. The standardized CPUE from 2004 to 2011, except for 2003 and 2010, showed a steady trend, and then increased until 2014. The CPUE in 2015 decreased, and in 2016 was higher than that in 2015. The result of GLM suggests that the effect of the catch ratio of Pacific bluefin tuna is the largest factor affecting the nominal CPUE.
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