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題名 | A Numerical Comparison of Adjusted Catch Per Unit Effort Trends of North Atlantic Albacore Stock Standardized by Honma and General Linear Model Methods=北大西洋長鰭鮪系群以本間法及泛線性模式法所修正之單位努力漁獲量數值之比較 |
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作者 | 許建宗; |
期刊 | 臺灣水產學會刊 |
出版日期 | 19940600 |
卷期 | 21:2 1994.06[民83.06] |
頁次 | 頁101-120 |
分類號 | 439.24 |
語文 | eng |
關鍵詞 | 泛線性模式法; 本間法; 長鰭鮪; 單位努力漁獲量; GLM; Honma method; Albacore; ASPIC; Catch per unit effort; |
中文摘要 | 依據商業化漁業之單位努力漁獲量從事資源評估,首先需有可足以代表該研究系群的指標。本文考慮為傳統所使用且較有力的漁獲努力量和單位努力漁獲量的標準化方法:即泛線性模式法(GLM)和本間法,對以臺灣鮪延繩釣漁業作業報表為基礎所計算而得之單位努力漁獲和所估計的月別五度方格漁獲統計資料進行標準化。本文嘗試探討由此兩種方法所修正後的單位努力漁獲量值和用ASPIC生產模式分析做臺灣鮪延繩釣漁業的修正資源量指標之比較。 修正後的單位努力漁獲量數值比較顯示,使用於GLM的因子可決定是否會影響和由本間法所估得之數值相匹配。不同方法標準化的單位努力漁獲量,應用於ASPIC分析獲得擁然不同的參數估計值。用GLM標準化者之最大持續生產量為54,720公噸,最適漁獲量死亡率為每年0.939;以本間法標準化者分吸為74,340公噸和每年0.592。且由資源生物量和達成最大持續生產量的生物量比值,與漁獲死亡率和最適漁獲量死亡率比值的結果顯示,年度數值雖有差異,但已大西洋長鰭鮪資源開發趨勢份出現尚處於適度開發中,尤以近一九九○年為是。且由GLM標準他的單位努力漁獲量所估的參數一澳前所估計者較為相似。 |
英文摘要 | Note that most stock assessments based on commercial catch per unit effort (CPUE) series have a CPUE trend being able to represent the study stock is in priority in analysis. In this paper, consider two representative methods, general linear model (GLM) and Honma's method of effort standarization on logbooks (data set 1) and on time series catch and effort data of Taiwanese longline fishery (data set 2). Those two methods are conventional and powerfully developed algorithm in standardizing fishing effort and CPUE series. This paper is trying to copare the results of both methods applied on Taiwanese longline fishery through investigations of CPUE values adjusted and ASPIC production analysis. The results of adjusted CPUE values comparison show that factors used in GLM influence the values whether or not is compatible with those from Honma's method. However, the factors were limited in some cases, GLM cannot be satisfied to standaridize CPUE for data mixture of different fishing patterns, the results from Honma's method perform better than those from GLM under this case. That different CPUE trends apply on ASPIC analysis has resulted in obtinaing different CPUE estimated parameters. A maximum sustainable yield was estimated as 54720 MT for the GLM standardized CPUE series, and 74340 MT for the honnma's method series; The optimal fishing omotlity were estimated as 0.9.9/year and 0.592/year for GLM and Honma's method, respectively. Those results of biomass and fishing mortality ratio indicate that the north Atlantic albacore stock is underexploited, inparticular, for the recent years. Consequently, the parameters estimated from GLM standardized series seem to be much more similar with previous estimates than from Honma's method. |
本系統之摘要資訊系依該期刊論文摘要之資訊為主。