Korean Journal of Ichthyology (한국어류학회지)

The Ichthyological Society of Korea (한국어류학회)
권호 표지

Winter Warming and Long-term Variation in Catch of Yellowtail (Seriola quinqueradiata) in the South Sea, Korea

겨울철 온난화와 남해 방어 어획량의 장기변동

  • Lee, Seung-Jong (Marine and Environmental Research Institute, Cheju National University) ;
  • Go, You-Bong (Division of Applied Marine Science, Cheju National University)
  • 이승종 (제주대학교 해양과환경연구소) ;
  • 고유봉 (제주대학교 해양과학부 해양생산과학전공)
  • Received : 2006.08.03
  • Accepted : 2006.09.18
  • Published : 2006.12.31
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Abstract

The relationships among long-term climate variation at the southern part of the Korean peninsula, oceanic conditions in the South Sea, Korea, and variation in the winter catch of yellowtail (Seriola quinqueradiata) were analyzed using 32 years of time-series data from 1971~2002. In the early 1990s, winter climatic conditions at the southern part of Korean peninsula shifted from a cool to a warm regime with higher air temperature, relative weak wind speed, and lower relative humidity. Also, the winter water temperature at 50 m depth became consistently higher in the South Sea. The annual winter catch of yellowtail in the South Sea increased dramatically in the early 1990s, as did that of anchovy, which is the major food organism for yellowtail. From the results of correlation analysis, we found that the winter catch of yellowtail was more closely related to the increasing of air temperature, water temperature and anchovy catch.

1971~2002년까지의 지난 32년간 장기간 시계열 자료를 통하여 겨울철 남해의 방어 어획량 변동양상을 계절별로 구분하여 조사하고, 이와 더불어 겨울철 한국 남부의 기상상황 및 남해의 해황 변화도 조사하여 장기간의 환경변화와 방어의 어획량 변동 사이의 대응관계에 대해서 살펴보았다. 겨울철 우리나라 남부의 기상변동을 살펴본 결과 1990년대에 들어서 기온이 상승하고 상대습도는 낮아지며 풍속이 많이 약화되는 특징들을 보이는 등 전체적으로 온난화 경향을 나타내고 있었고, 겨울철 남해의 50 m 수층 수온도 이 시기부터 뚜렷이 상승하고 있었다. 이와 관련하여 남해의 방어 어획량 변동양상을 계절별로 구분하여 조사한 결과 타 계절에 비해 특히 겨울철 생산량이 1990년대에 들어서부터 점차 증가하고 있었으며 방어의 주먹이원의 하나인 멸치의 어획량도 이 시기부터 증가하고 있었다. 이번 연구에서 조사한 기상 요인들을 포함한 환경 요인들과 겨울철 남해 방어 어획량 자료를 이용하여 상관분석을 실시한 결과 겨울철 방어 어획량의 증가는 겨울철 기온과 수온의 증가 그리고 멸치 어획량의 증가와 매우 밀접하게 연관되어 있다는 것을 알 수 있었다.

Keywords

Acknowledgement

Supported by : Cheju National University Development Foundation

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