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臺灣東部海域翻車魨類魚種移動行為特徵研究

  • 日期:108-02-12
  • 計畫編號:108農科-9.2.3-水-A1(5)
  • 年度:2019
  • 領域:漁業科技研發
  • 主持人:張景淳
  • 研究人員:吳瑞賢、蔡富元、許紅虹、江偉全、林憲忠、張綦璿

本研究於2018至2019年於臺灣東部海域利用彈脫型衛星標識紀錄器標放兩尾體型大於200公分的翻車魨,並探討其水平與垂直移動特徵研究。一枚標識器結附於翻車魨身上148天後於南中國海彈脫,另一枚則於結附於花紋翻車魨魚體18天後彈脫,並在花蓮海灘被尋回。利用海水表溫校正後計算出翻車魨可能移動路徑為往北洄游至東中國海後,往南移動至臺灣東部海域附近,再向西移動至日本沖繩沿海。翻車魨移動與海流流向相反。此外,兩尾翻車魨都有日夜垂直移動的行為特徵。白天主要棲息於斜溫層下層海域 (>72%),有時候會移動至表水面,棲息環境溫度再12-16 ̊C;晚上主要棲息於混合層水域,棲息水溫範圍在18-24  ̊C。結論為翻車魨水平與垂直移動行為與周圍水溫變化、斜溫層深度與獵物有關。

研究報告摘要(英)


The horizontal and vertical movements of two large sunfishes (TL >200 cm) were investigated using popup satellite archival tags off the eastern coast of Taiwan in 2017-2018. One tag on Mola mola popped up at the South China Sea after 148 days and another on Mola alexandrini was recovered after deployment of 18 days. Most probable tracks estimated by Kalman filter with matching sea surface temperature, suggested that the tagged Mola mola moved in a northerly direction to the East China Sea, and then went eastward and southward to eastern Taiwan. Then it moved west to the coast of Miyakojima and Okinawa Island, Japan. During these movements, the fish experienced thermal fronts and moved against the prevailing current. Both fish exhibited distinct diel oscillations in their vertical movements. During daytime periods, tagged fish spent most of their time (> 72%) below the thermocline and sometimes ascended to the surface, and experienced water temperature of 12-16 ̊C. During nighttime periods, the vertical movements were confined to the mixed layer with water temperature ranging from 18-24 ̊C. Depth patterns were different between December to mid-January and mid-January to May, during which descents were correlated with the strength of the thermocline. These movements suggest that sunfish can shift their horizontal and vertical patterns in response to changing ambient water temperature, thermocline, and prey availability.