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研究生:張鈺廷
研究生(外文):Yu-Ting Zhang
論文名稱:以年級群解析法及單位加入親魚量模式進行臺灣東北部海域淺海狐鮫之資源評估
論文名稱(外文):Virtual population analysis and spawning per recruit estimation of the pelagic thresher shark, Alopoas pelagicus in the northeastern waters off Taiwan
指導教授:倪怡訓、劉光明
學位類別:碩士
校院名稱:國立臺灣海洋大學
系所名稱:海洋資源管理研究所
學門:商業及管理學門
學類:其他商業及管理學類
論文種類:學術論文
論文出版年:2005
畢業學年度:94
語文別:中文
論文頁數:71
中文關鍵詞:淺海狐鮫資源評估單位加入親魚量年級群解析
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摘要

本論文之目的係以年級群解析法 (Virtual population analysis) 及單位加入親魚量模式 (Spawning per recruit model) 評估台灣東北部海域淺海狐鮫 (Alopias pelagicus) 之資源狀況。將1989至2004年在南方澳漁港所拍賣的48,245尾淺海狐鮫體重資料,經由體重-尾前長關係式 轉換為尾前長。再利用雌雄合併之von Bertalanffy成長方程式 (蔡 2004) 將尾前長轉為年齡。由體長頻度漁獲曲線法,估得1989-2004年全死亡係數 (Z) 介於0.264-0.346 yr-1。由Hoenig (1983) 的經驗式估得自然死亡係數 (M) 為0.132 yr-1,1989至2004年開發率 (E) 介於0.502至0.620之間,平均為0.553。以年級群解析法利用Pope (1972) 之近似法估得淺海狐鮫的資源量由1989年的83,260尾到2003年的78,181尾。將每年隨機改變的自然死亡係數代入單位加入親魚量模式進行模擬,得到%SPR最高為1989年的50.7% (±0.5%),最低為1996年的36.1% (±0.6%),平均為42.4% (±0.5%)。根據35 %SPR生物參考點,1989-2004年全部皆高於參考點;若以較高的40 %SPR為生物參考點,則有6年低於參考點,顯示台灣東北部海域淺海狐鮫的資源仍必須持續地監控才能確保其永續利用。
關鍵字:淺海狐鮫、資源評估、單位加入親魚量、年級群解析
目錄
謝辭......................................................Ⅰ
中文摘要..................................................Ⅱ
英文摘要..................................................Ⅲ
第一章 前言.............................................1
第二章 材料與方法.........................................6
2.1 資料的來源.....................................6
2.1.1 體長及體長資料的蒐集.......................6
2.1.2 漁獲量資料的蒐集...........................6
2.2 資料的處理與分析...............................7
2.2.1 體重及體長的關係...........................7
2.2.2 成長方程式的估計...........................7
2.2.3 尾前長及年齡的估計.........................8
2.2.4 死亡係數的估計.............................8
2.3 性成熟體長之判定..............................10
2.4 年級群解析法..................................10
2.5 生活史階段別之劃分............................13
2.6 單位加入親魚量模式............................14
第三章 結果..............................................16
3.1 體重及體長關係式..............................16
3.2 體長及年齡關係式..............................16
3.3 死亡係數......................................16
3.3.1 全死亡係數................................17
3.3.2 自然死亡係數..............................17
3.3.3 漁獲死亡係數及開發率......................17
3.4 年級群解析法..................................18
3.4.1 年齡別之資源尾數..........................18
3.4.2 生活史階段別之資源狀況....................18
3.4.3 年齡別之漁獲死亡係數......................19
3.5 單位加入親魚量................................20
第四章 討論..............................................21
4.1 本研究之假設..................................21
4.2 成長參數之可靠性..............................21
4.3 體重與尾前長轉換之問題........................21
4.4 死亡係數之估計................................22
4.4.1 全死亡係數................................22
4.4.2 自然死亡係數..............................22
4.5 資源量與餌料生物之關係........................23
4.6 年級群解析法之誤差............................24
4.7 生殖策略之探討................................26
4.8 單位加入親魚量模式............................27
4.9 資源狀況......................................28
4.10 結論.........................................29
參考文獻.................................................31
附表.....................................................39
附圖.....................................................51
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