臺灣博碩士論文加值系統

本研究係根據1995∼1997年間南太平洋台灣鮪延繩釣漁業作業日報表（logbook）資料，分析南太平洋鮪長鰭鮪分佈與洄游之情形。分析結果顯示：就長鰭鮪之平均體重的分佈情形來看，南太平洋長鰭鮪不同發育階段的分佈，依緯度高低明顯的可以分成三個區域：南太平洋高緯度地區，主要為未成熟群（小於12Kg） 的分佈區域；低緯度地區，主要為成熟群（大於或等於12Kg）的分佈區域；中緯度地區，則為兩者之交混區域。由月別CPUE的變動情形分析的結果顯示：（1）南太平洋長鰭鮪成熟群主要洄游方式是在0°S∼30°S之間呈一逆時針方向洄游。（2）未成熟群主要洄游方式是在30°S∼45°S之間，隨著海流由西太平洋向東太平洋洄游。
綜合南太平洋長鰭鮪的作業漁場和平均體重大小的季節性變動、CPUE的月別變動、再配合南太平洋洋流的分佈與流向研判，推測南太平洋長鰭鮪的分佈與洄游情形大致如下：在澳洲東北方低緯度區域主產卵場孵化之長鰭鮪仔稚魚，可能順著東澳洲洋流（East Australian Current）逐漸地成長而南下至澳洲東南方海域。而後在澳洲東南方海域附近形成中、幼年齡群（12Kg以下之未成熟群為主）。此群的主要分佈海域在30°S∼45°S之間的亞熱帶海域。隨後逐漸成長，並隨著海流由西向東洄游。成長達成熟年齡時（12Kg以上），再由該區域逐漸往北移至溫暖的海域（0°S∼30°S），而後形成索餌及預備產卵群，隨後順著南赤道流（South Equatorial Current）由東部太平洋向西順移動，在澳洲東北方海域的低緯度區（產卵場）逐漸形成產卵群產卵。此時期的長鰭鮪主要分佈在0°S∼30°S之間的海域，並呈一逆時針方向的洄游。

目錄...........................................................i
表次.........................................................iii
圖次..........................................................iv
摘要..........................................................vi
謝辭.........................................................vii
第1章 緒言 ....................................................1
1-1 長鰭鮪的漁業與資源.......................................1
1-2 太平洋長鰭鮪的分佈與洄游之概況...........................3
1-3 究動機及目的.............................................4
第2章 材料與方法 ..............................................6
2-1 資料來源.................................................6
2-2 分析方法.................................................7
2-2-1 作業型態持續性之研判.................................7
2-2-2 作業型態之分離法.....................................7
2-2-3 成熟群與未成熟群之研判...............................7
2-2-4 不同時期之分佈與洄游.................................8
2-2-5 CPUE的季節性變動分析................................8
第3章 結果 ...................................................10
3-1 資料之分離..............................................10
3-1-1 作業型態持續性之研判................................10
3-1-2 作業型態之分離......................................11
3-2 南太平洋長鰭鮪的分佈與洄游..............................14
3-2-1 不同發育階段的主要分佈情形..........................14
3-2-2 CPUE的季節性變動分析...............................16
3-2-3 成熟群與未成熟群之洄游情形..........................17
第4章 討論 ...................................................19
4-1 資料方面................................................19
4-2 分佈與洄游之研判........................................20
4-3 分佈洄游與海況的關係....................................22
4-3 今後的研究..............................................23
第5章 結論 ...................................................25
參考文獻 .................................................... 27
表 ...........................................................31
圖 ...........................................................41
附錄..........................................................57

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