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CPUE standardization of Pacific bluefin tuna caught by Korean offshore large purse seine fishery (2003-2016)

우리나라 대형선망어업에서 어획된 태평양참다랑어의 CPUE 표준화(2003-2016)

  • LEE, Sung Il (Distant Water Fisheries Resources Research Division, National Institute of Fisheries Science) ;
  • KIM, Doo-Nam (Distant Water Fisheries Resources Research Division, National Institute of Fisheries Science) ;
  • LEE, Mi-Kyung (Distant Water Fisheries Resources Research Division, National Institute of Fisheries Science) ;
  • JO, Heon-Ju (Distant Water Fisheries Resources Research Division, National Institute of Fisheries Science) ;
  • KU, Jeong-Eun (Distant Water Fisheries Resources Research Division, National Institute of Fisheries Science) ;
  • KIM, Jung-Jin (Coastal Water Fisheries Resources Research Division, National Institute of Fisheries Science)
  • 이성일 (국립수산과학원 원양자원과) ;
  • 김두남 (국립수산과학원 원양자원과) ;
  • 이미경 (국립수산과학원 원양자원과) ;
  • 조헌주 (국립수산과학원 원양자원과) ;
  • 구정은 (국립수산과학원 원양자원과) ;
  • 김중진 (국립수산과학원 연근해자원과)
  • Received : 2018.04.30
  • Accepted : 2018.05.23
  • Published : 2018.05.31

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.

Keywords

Pacific bluefin tuna;Purse seine;CPUE;Standardization

Acknowledgement

Supported by : 국립수산과학원

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