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Standardization of CPUE for bigeye(Thunnus obesus) and yellowfin(Thunnus albacares) tunas by the Korean longline fishery in the Indian Ocean

우리나라 다랑어연승어업에 의한 인도양해역 눈다랑어(Thunnus obesus) 및 황다랑어(Thunnus albacares)의 CPUE 표준화

  • Kwon, You-Jung (Department of Fisheries Physics, Graduate School, Pukyong National University) ;
  • An, Doo-Hae (Distant Water Fisheries Resources Division, National Fisheries Research and Development Institute) ;
  • Lee, Jae-Bong (Fisheries Resources Research Division, National Fisheries Research and Development Institute) ;
  • Zhang, Chang-Ik (Department of Fisheries Physics, Graduate School, Pukyong National University) ;
  • Moon, Dae-Yeon (Distant Water Fisheries Resources Division, National Fisheries Research and Development Institute)
  • 권유정 (부경대학교 대학원 수산물리학과) ;
  • 안두해 (국립수산과학원 해외자원과) ;
  • 이재봉 (국립수산과학원 자원연구과) ;
  • 장창익 (부경대학교 대학원 수산물리학과) ;
  • 문대연 (국립수산과학원 해외자원과)
  • Published : 2008.08.29

Abstract

This study standardized catch per unit effort(CPUE) of the Korean longline fishery, which has been used to assess the status of stock as an index of abundance, for bigeye and yellowfin tunas in the Indian Ocean. The Generalized Linear Model(GLM) was used to analyze the fishery data, which were catch in number and effort data collected each month from 1971 to 2007 by $5\;{\times}\;5$ degree of latitude and longitude. Explanatory variables for the GLM analysis were year, month, fishing area, number of hooks between floats(HBF), and environment factors. The HBF was divided into three classes while the area was divided into eight subareas. Although sea surface temperature(SST) and southern oscillation index(SOI) were considered as environmental factors, only SST was used to build a model based on statistical significance. Standardized CPUE for yellowfin tuna showed a declining trend, while nominal CPUE for the species showed an increasing trend.

Keywords

Bigeye tuna Thunnus obesus;Yellowfin tuna Thunnus albacares;Standardized CPUE;Generalized Linear Model;Indian Ocean

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