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台灣西南海域黃鰭鮪延繩釣漁場形成機制研究

  • 日期:104-02-26
  • 計畫編號:103農科-11.2.1-水-A1(2)
  • 年度:2014
  • 領域:漁業科技研發領域
  • 主持人:翁進興
  • 研究人員:吳龍靜、賴繼昌、楊清閔、黃星翰、陳文妤、陳秋月、許明樹、何珈欣、葉信明

黃鰭鮪為台灣為延繩釣之主要魚種,作業海域為台灣西南海域延伸至南中國海,它是沿近海漁船作業主要之漁業資源,延繩釣作業漁獲黃鰭鮪主要季節在春及秋季,春季主要作業海域在南中國海,隨著季節改變而朝台灣西南海域接近,今年漁獲情況不佳,南中國海作業時間為僅有5個月,在單位努力漁獲量(CPUE)隨著水溫改變明顯變化,延繩釣CUPE最高以4月0.6尾/100鈎,1月最低0.2尾/100鉤,隨著水溫上升有提高之趨勢。5月後表水溫升高至29℃漁期結束。
一支釣方面,9~11月為台灣西南海域之盛漁期,CPUE以11月最高5.6尾/日,9月最低5.6尾/日。在水溫環境觀測方面,黃鰭鮪漁獲量明顯受水溫變動影響,當水溫下降或升高至26~28℃時,此水溫環境下為黃鰭鮪漁獲較佳之季節,顯見黃鰭鮪對此水溫有明顯偏好。

研究報告摘要(英)


Yellowfin tuna is the main target species of longline fishery in offshore waters of Taiwan. The main fishing ground from southwestern waters of Taiwan extending to the south of China Sea, it is very important fishery resources. The longline fishery operation began on spring in south of China Sea in spring, move to southwestern waters of Taiwan in the autumn. Yellowfin tuna catches poor performance in this year, the operation times just five months. During this fishing period, the longline catch per unit effort (CPUE) high of 0.6 fish/100 hooks in April, to a low of 0.2 fish /100 hooks in January. As the rises sea surface temperature (SST), yellowfin tuna catches with increased. The surface water temperature reaches 29 to 30℃, the fishing period is ending. The handline fishery operation began in September to November in southwestern waters of Taiwan. The handline CPUE high of 5.6/day in November, to a low of 1.3/ day in September. The yellowfin tuna catches significantly affected by water temperature changes, when the temperature rises to 26 ~ 28℃, the yellowfin tuna catches increases, showing yellowfin tuna this water temperature obvious preference.