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頁籤選單縮合
題名 | Stock Assessment of Albacore in the Indian Ocean by Age-Structured Production Model=應用年齡群化生產量模式評估印度洋長鰭鮪系群 |
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作者 | 許建宗; |
期刊 | 臺灣水產學會刊 |
出版日期 | 19950300 |
卷期 | 22:1 1995.03[民84.03] |
頁次 | 頁1-13 |
分類號 | 439.24 |
語文 | eng |
關鍵詞 | 長鰭鮪; 年齡群化生產量模式; Albacore; Age-structured production model; |
中文摘要 | 印度洋長鰭鮪為我國最重要的鮪漁業之一。歷經日本在一九五○年代至一九七 ○年代中期的鮪延繩釣魚業捕撈,和我國在一九七○年代取代日本積極開發以來,更在一 九八三年至一九九二年間以大目流刺網開發利用,其所受漁獲努力量為歷年來之最。但是 一致性的評估結果無法有效獲得,因此本文係採用所發展之年齡群化生產量模式來評估此 一系群,藉以釐清傳統生產量模式評估所帶來之不確定性,以及流綱漁業所可能引發的資 源量消耗問題。 本文中檢討了七組資源量指標,其中五組被採用於本文的年齡群化生產量模式分析。 靈敏度分析顯示不同國家的資源量指標可以獲得不同生產量模式參數值,但同一國家的資 源量指標所佔得的參數,如最大持續生產量、現時資源量、資源量比、及置換生產量等大 致相同。本分析結果也闡述本印度洋長鰭鮪系群尚處於低開發狀態,大目流刺網漁業並未 對本系群之消耗帶來顯著影響。 |
英文摘要 | The albacore fishery in the Indian Ocean is one of the most important Taiwanese tuna fisheries. The stock was exploited by Japanese longline fishery from 1950's to the middle of 1970's, and then surpassed by Taiwanese longline fishery. Recently, Taiwanese pelagic gillnet fishery anticipated in heavy exploition of the stock from 1983 to 1992. The stock has been exploited for several decades, and its effect has been assessed but without a uniform, concrete result. Therefore this study was aimed to assess the stock by using recent developed age-structured production model to clarify the uncertainty introduced from the traditional production model, and to determine whether the stock was depleted by the pelagic gillnet fishery. Seven time series of abundance indices resulted in different estimates of parameters. However, the results obtained, such as maximum sustainable yield, biomass ratio, current biomass and replacement yield were fairly similar among the five series. The results also showed that the status of albacore stock in the Indian Ocean was still under the condition of under-exploition, and the pelagic gillnet fishery did not cause the stock depletion. |
本系統之摘要資訊系依該期刊論文摘要之資訊為主。