Korean Journal of Fisheries and Aquatic Sciences (한국수산과학회지)

The Korean Society of Fisheries and Aquatic Science (한국수산과학회)
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Spatial Variations in the Catch of Billfishes in the Pacific Ocean and Factors Affecting Annual Changes in the Catch

태평양 새치류의 어장분포와 어획량 경년 변동에 영향을 미치는 요인

  • Yoo, Joon-Taek (National Fisheries Research and Development Institute) ;
  • Hwang, Seon-Jae (National Fisheries Research and Development Institute) ;
  • An, Doo-Hae (National Fisheries Research and Development Institute)
  • 유준택 (국립수산과학원 자원연구과) ;
  • 황선재 (국립수산과학원 자원연구과) ;
  • 안두해 (국립수산과학원 자원연구과)
  • Published : 2009.12.31
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Abstract

This study includes spatial variations in the catch of billfishes in the Pacific Ocean and examines factors affecting interannual changes in the catch. Main billfish species caught by Korean tuna longline fishery were blue marlin and swordfish. A main fishing ground of the species was the tropical Pacific Ocean, while additional fishing ground of billfishes tended to be formed in the Pacific coast of Mexico in the El Nino periods. Further, the catch of billfishes was significantly related to CPUE (tons/average of the used hooks/vessel) in the entire Pacific Ocean as an index of stock abundance and equatorial SOI (EQSOI) as an index of El Nino event. Annual changes in the catch of billfishes in the Pacific Ocean could be regulated mainly by variations of stock abundance. In addition, increase of the density of billfishes in the tropical Pacific and additional formation of fishing ground by El Nino event possibly contribute to increase of the catch of billfishes in the Pacific Ocean. On the other hand, linear regression model may be more adequate in the analysis of relationships between fisheries data and indices made from using some environmental factors.

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References

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