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題 名 | Further Calibration Incorporating with Yearly Changes of Biomass and Surplus Production from Results of Virtual Population Analysis for North Atlantic Albacore=應用年級群分析結果配合生物量和餘量生產的年度變化對北大西洋長鰭鮪系群狀態做進一步的評估 |
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作 者 | 許建宗; | 書刊名 | 臺灣水產學會刊 |
卷 期 | 23:3 1996.09[民85.09] |
頁 次 | 頁165-180 |
分類號 | 439.24 |
關鍵詞 | 大西洋長鰭鮪; 漁獲能率; 年度餘量生產; 資源量指標; Atlantic albacore; Catchability; Annual surplus production; Abundance index; |
語 文 | 英文(English) |
中文摘要 | 大西洋長鰭鮪為臺灣鮪延繩釣漁業最重要的漁獲物之一。歷年來該族群為大西洋鮪 類資源保護委員會以北緯五度分隔成北、南系群加以管理的評估。然而,近來年級群分析和 生產量模式評估結果的差異,使資狀態的判定產生不確定性,因此,本報告採用年級群分析 的結果,進一步估算年度餘量生產、生物量的變化和漁獲能率,以了解在表層漁具和鮪延繩 釣漁具開發下,北大西洋長鰭鮪系群的資源和漁業狀態。首先,以臺灣和日本的鮪延繩釣漁 業及西班牙和法國的表層漁業繫準化單位努力漁獲量做為基本資源量指標,先以年級群分析 法估計年齡別資源量和漁獲死亡率,再依據此一結果估計年度總生物量、加入群生沕量和年 度餘量生產。 結果顯示:1976年至1987年的加入群生物量呈急速下降趨勢,再上升到1993年約為1984 年的水準。本系群在1976年、1986年和1987年有被漁獲高峰,這些漁獲高峰造成在1979 年、1984年和1989年的年度餘量生產下降。且在1976年至1979年間和1986年至1989年 間的年度餘量生產下降延滯可能是受高捕獲量、1987年至1988年強年級群的出現和1970年 代之高資源量所致。 1987年以後,由於臺灣鮪延繩釣漁船的轉移和作業方式的改變,在北大西洋的總漁獲量 大幅下降,因此,北大西洋長鰭鮪系群的生物量和年度餘量生產年年增加,1993年因新漁具 的加入漁獲量約略相等於年度餘量生產。近來,年度加入生物量有顯著增加,故本研究系群 應是處於中度至完全開發的狀態。 |
英文摘要 | Northern Atlantic albacore is one of the most important target species of Taiwanese longline fishery. Traditionally the stock is assessed and managed by production models analysis and recently by adaptive virtual population analysis. Although results. Although results obtained from those assessments have indicated that the stock is in fully exploited condition, the incoincident assessing results among those analyses have difficulty to conclude the stock status definitely, therefore this paper is dealt with the analyses of annual surplus production, changes of stock biomass and catchability to understand the status of the stock suffering surface and longline gears. Taiwanese and Japanese longline and Spanish and French troll standardized aboundance indices were used to estimate relative abundance at age, fishing mortality at age by adaptive virtual population analysis. Accordingly, the annual 2-year-old recruited biomass and annual surplus production (ASP) were estimated. The results show that annual 2-year-old recruited biomass declined abruptly from 1976 to 1987, and sharply increased to 1993 as the 1984 level. There are three catch peaks, in 1976, 1983 and 1987, those peaks resulted in declining of the ASP in 1979, 1984 and 1987. The delays 1976-1979 and 1986-1989 may be affected by the high catches, the appearance of strong 1987-1988 year-classes, and the high abundance of the stock in 1970's. After 1987, Taiwanese longline fleets have changed their fishing pattern and total catch in the north Atlantic was abruptly decreased, consequently, the biomass and ASP of the stock gradually increased year to year. The annual catch is almost equivalent to or lower than the corresponding ASP in 1993 due to the introduction of new fishing gears. Recently the annual recruit biomass increased significantly, it could be concluded that the stock was in full to moderate exploited condition. |
本系統中英文摘要資訊取自各篇刊載內容。