Journal of the Korean Society of Fisheries and Ocean Technology (수산해양기술연구)

The Korean Society of Fisheries and Ocean Technology (한국수산해양기술학회)
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Changes in fishing characteristics and distributions of Korean tuna purse seine fishery by oceanographic conditions in the Pacific Ocean

태평양 수역 우리나라 다랑어선망어업의 조업 특성 및 해양환경에 따른 어장 변동

  • LEE, Mi-Kyung (Distant Water Fisheries Resources Research Division, National Institute of Fisheries Science) ;
  • LEE, Sung-Il (Distant Water Fisheries Resources Research Division, National Institute of Fisheries Science) ;
  • LEE, Chun-Woo (Division of Marine Production System Management, Pukyong National University) ;
  • KIM, Zang-Geun (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)
  • 이미경 (국립수산과학원 원양자원과) ;
  • 이성일 (국립수산과학원 원양자원과) ;
  • 이춘우 (부경대학교 해양생산시스템관리학부) ;
  • 김장근 (국립수산과학원 원양자원과) ;
  • 구정은 (국립수산과학원 원양자원과)
  • Received : 2016.05.18
  • Accepted : 2016.05.31
  • Published : 2016.05.31
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Abstract

Fishing characteristics of Korean tuna purse seine fishery in the Pacific Ocean were investigated using logbook data compiled from captain onboard and the statistical data from 1980 to 2014. Changes in fishing ground and correlation between marine environmental factors and fishing patterns were investigated using Oceanographic index. The proportion of unassociated set was higher than that of associated set. The catch proportion of yellowfin was higher in the unassociated set, while that of skipjack and bigeye was higher in the associated set. Due to vessels, fishing gears and Korean captains' high-level of skills in fishing technology optimized for the unassociated set and preference of large fishes, especially large yellowfin tuna, it showed unique fishing characteristics focusing on the unassociated set. As for fishing distributions of Korean tuna purse seine fishery and impacts of oceanographic conditions on the fishery, the main fishing ground was concentrated on the area of $5^{\circ}N{\sim}10^{\circ}S$, $140^{\circ}E{\sim}180^{\circ}$ through the decades. When stronger El-nino occurred, the range of fishing ground tended to expand and main fishing ground moved to the eastern part of western and central Pacific Ocean. During this season, yellowfin tuna had high CPUE and catch proportion of yellowfin tuna in the eastern part also increased. As for the proportion of fishing effort by set type, proportion of log associated set was high during El-nino season while that of FAD associated set was high during La-nina season.

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References

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