查詢結果分析
相關文獻
- Recruit Estimation and Its Relationship with Spawner for the North Atlantic Albacore Stock Using Commercial Catch Data
- Reconsideration of Assessing South Pacific Albacore Stocks(Thynnus alalunga)
- Simulation of Age-Structured Leslie Matrix Model to Evaluate the Reproductive Values of the North Atlantic Albacore Stock
- Seasonal Changes of the Distribution of South Pacific AlBacore Based on Taiwan's Tuna Longline Fisheries, 1971-1985
- 北太平洋長鰭鮪資源的研究與開發(2):表層漁業漁場
- Examination on Recent Increase in Juvenile Catch of South Atlantic Albacore Thunnus alalunga: Observations and Implications
- Fluctuation of the South Pacific Albacore Stocks(Thynnus alalunga) Relative to the Sea Surface Temperature
- 北太平洋之長鰭鮪資源
- A New Assessment Approach Using Fuzzy Surplus Production Model to Evaluate the Albacore Stock in the Indian Ocean
- Using Fuzzy Synthesis Approach to Extract Fishing Efforts Directed on Albacore for Taiwanese Longline Fleets in the Indian Ocean
頁籤選單縮合
題 名 | Recruit Estimation and Its Relationship with Spawner for the North Atlantic Albacore Stock Using Commercial Catch Data=北大西洋長鰭鮪系群加入量的估計和與產卵群關係之應用 |
---|---|
作 者 | 許建宗; 劉錫江; | 書刊名 | 臺灣水產學會刊 |
卷 期 | 26:2 1999.06[民88.06] |
頁 次 | 頁73-84 |
分類號 | 439.24 |
關鍵詞 | 長鰭鮪; 加入量; 產卵母族群與加入群關係; Allen氏法; Albacore; Recruit; Spawner-recruit relationship; Allen's method; |
語 文 | 英文(English) |
中文摘要 | 北大西洋長鰭鮪系群為鮪延繩釣漁業和表層漁業(如活餌釣、曳繩釣和流網漁業 )所開發利用。經由各種生產量模式和年級群分析法的評估分析,本系群經四十餘年的捕 撈,已經處於完全開發的狀態。產卵母族群生物量從一九八五年以來呈下降趨勢,而旦加 入群量在近十年來呈劇烈的波動,但其產卵群和加入群間關係則尚未能完全確知。因此, 本研究擬採用年齡別漁獲量資料,以Allen氏法佔求各年加入量和加入年齡的年間變化,再 據以套適產卵母旅群量-加入量間的關係,研究結果期能提供該系群可信的加入群參數資 訊。 Allen氏加入量估計結果顯示:加入群主要依隨表層漁業的漁獲量來決定,故完全加 入年齡估計為2歲。以傳統定義五歲以上為成魚,配合2年的時間遲延,產卵群(S)和加入 量(R)間關係可以套適為:R=1.1618e□(Ricker型)及 R=□ (Beverton a Holt型)。觀測和理論加入量比較,自1987年起有顯著差異。加入量之百分 差異和產卵群量關係顯示,套適的Beverton and Holt模式比Ricker模式較合適來表現北 大西洋長鰭鮪系群之產卵群和加入群關係。該模式的建構可以應用於未來系群投射的研究。 |
英文摘要 | The northern Atlantic albacore stock has been harvested by longlines and surface gears (baitboats, trolls and gilinets) for more than 40 years. Recently the stock was evaluated in a fully exploited status through the production models and virtual population analyses. The spawning stock biomass has declined since 1985, and the recruits have shown greatly fluctuation during the recent decade. But the relationship between spawner and recruit is not well known. Therefore, The present study uses Allen's method to estimate the recruits and to investigate the variation between recruited ages from commercial catch and size data. Accordingly, the spawner-recruit relationship was fitted using those data. The results could provide a reliable recruit parameter for the stock. Allen's recruit estimation showed that recruits mainly depended on catches of surface fisheries, so fully recruited age 2 was investigated. Further, the mature age was set about 5-year-old as usual, and two-year Jag was used to relate the spawners (S) and recruits (R). Then, the spawner-recruit relationship was fitted as: Ricker type, R=16.1618e□, and the Beverton and Holt type, R= □ The comparison between observed and predicted recruits showed that the greater discrepancy occurred after 1987. The percentage variation in terms of spawner revealed that the formulated Beverton and Holt type was more appropriate than the Ricker type to express the spawner-recruit relationship for the north Atiatitic albacore stock. As long as the Beverton and Holt spawner-recruit relationship was built, the application on stock projection may be pursued in the future. |
本系統中英文摘要資訊取自各篇刊載內容。