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| 題 名 | Standardized Catch Per Unit Effort of Albacore Tuna (Thunnus alalunga) for the Taiwanese Distant-water Longline Fishery in the North Atlantic Ocean, 1967~2011=北大西洋臺灣遠洋鮪釣長鰭鮪單位努力漁獲量標準化(1967~2011年) |
|---|---|
| 作 者 | 謝其衡; 蘇楠傑; 葉顯椏; 孫志陸; 葉素然; | 書刊名 | 臺灣水產學會刊 |
| 卷 期 | 39:4 2012.12[民101.12] |
| 頁 次 | 頁223-234 |
| 分類號 | 439.24 |
| 關鍵詞 | 相對豐度指標; 泛線性模式; Delta方法; CPUE標準化; 資源評估; Relative index of abundance; Generalized linear model; Delta approach; CPUE standardization; Stock assessment; |
| 語 文 | 英文(English) |
| 中文摘要 | 除了資源豐度年間變動外，名目單位努力漁獲量（nominal CPUE）還受到其他因素影響，例如作業漁場的選擇、漁獲策略與目標魚種的不同，因此CPUE資料必須經過標準化，移除可能因子的影響後，才能作為資源評估所使用的相對豐度指標。本研究使用泛線性模式（generalized linear models, GLMs）以及delta方法對北大西洋台灣遠洋鮪釣長鰭鮪的漁業資料進行標準化，同時探討模式中使用目標魚種效應是否對標準化結果產生影響。結果顯示年與漁區效應可以解釋大部分的變異，且不同模式的結果一致（78~86%），而不同方法或是否考慮目標魚種效應對長鰭鮪CPUE標準化的影響不大。整體來說，長鰭鮪標準化CPUE在1970年前快速下降，但在1970年代至80年代後期維持相對穩定趨勢，之後呈現緩慢下降趨勢，2003年迄今的CPUE趨勢則略有上升。本研究以GLM分析的結果較佳，所提供的台灣遠洋鮪釣長鰭鮪標準化CPUE，可正確反映北大西洋長鰭鮪的資源變化。 |
| 英文摘要 | The trends in nominal catch per unit effort (CPUE) can be influenced by many factors in addition to stock abundance, including the choice of fishing location, operating strategy, and target species. Consequently, CPUE data need to be ‘standardized’ to remove the impact of such factors, and then could be used as an index of relative abundance in fisheries stock assessments. The catch and effort data for albacore tuna caught by the Taiwanese distant-water longline fishery in the North Atlantic Ocean from 1967 to 2011 were standardized using alternative approaches, i.e., generalized linear models (GLMs) and the delta approach. Sensitivity was explored to whether targeting effects of other species are included in the analyses. Year and area explained the most of the deviance (78~86%, depending on the model configuration), and both of them were identified consistently among methods. However, the trends in standardized CPUE of albacore tuna were found to be relatively insensitive to the approach used for catch and effort standardization, including whether the targeting effects were included in the analyses. With a drop before 1970, the trend in standardized CPUE of albacore in the North Atlantic Ocean was relatively stable during the 1970s to the late 1980s, but generally decreased thereafter and increased slightly from 2003 until present. The standardized CPUE of albacore from GLM for this fishery could be considered the best available results to reflect the relative abundance of the albacore stock in the North Atlantic Ocean. |
本系統中英文摘要資訊取自各篇刊載內容。