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研究報告

更新日期: 2015-02-09
點閱數: 1,328

太平洋黑皮旗魚及北太平洋與大西洋劍旗魚CPUE標準化暨資源研究

年度 2013
計劃名稱 太平洋黑皮旗魚及北太平洋與大西洋劍旗魚CPUE標準化暨資源研究
中文摘要 本研究彙整1967-2011年太平洋以及大西洋台灣鮪釣漁業資料,利用泛線性模式(generalized linear model)以及泛加成模式(generalized additive model)標準化太平洋黑皮旗魚以及北太平洋與南北大西洋劍旗魚CPUE,分析我國遠洋鮪釣漁業旗魚類資源豐度指標變動趨勢。結果顯示模式考慮因子包括年、月、經緯度與交感效應皆為顯著(P < 0.05),太平洋黑皮旗魚CPUE在2000年後有上升趨勢,但2005年後略微下降,近兩年CPUE維持相對穩定;北太平洋劍旗魚CPUE在2002-2005年呈現下降趨勢,但2005年後CPUE呈現上升趨勢;南北大西洋劍旗魚標準化 CPUE在1990年代呈現下降趨勢,但2000年後相對穩定且近兩年有略微上升的趨勢;考慮每筐鉤數資訊僅略微影響台灣鮪釣旗魚類CPUE標準化的結果。本研究利用年齡結構生產量模式評估太平洋黑皮旗魚以及南大西洋劍旗魚資源現況,結果顯示太平洋黑皮旗魚資源已接近完全開發程度(S/SMSY = 1.00),且目前漁獲死亡率高於維持最大可持續漁獲量(MSY)水準(F/FMSY = 1.22),顯示此資源處於過漁中(overfishing);南大西洋劍旗魚評估結果顯示,目前產卵親魚量低於MSY水準(S/SMSY = 0.89),但目前漁獲死亡率已低於MSY水準(F/FMSY = 0.79),顯示南大西洋劍旗魚資源雖已過漁(overfished),但未遭受過漁中(not overfishing)。本研究評估結果建議應持續注意此兩資源的變動趨勢。
英文摘要 Fishery data and catch information of the Taiwanese longline fleets in the Pacific and generalized additive model (GAM) to examine the trends of relative abundance index. All the effects considered in the CPUE standardization including year, month, latitude, longitude, and the interactions were statistically significant (P < 0.05). Standardized CPUEs of the Pacific blue marlin showed an increasing trend since 2000, but decreased slightly from 2005 and relatively stabilized in recent two years. The standardized CPUE of North Pacific swordfish decreased during 2002-2005, but increased since 2005. In both the South and North Atlantic Oceans, the standardized CPUE of swordfish sharply dropped in the late 1990s, and then stabilized from 2000 with higher values appeared in recent two years. The results were insensitive to the inclusion of gear configuration as explanatory variables in the model for all analyses of CPUE standardizations. The stock status of Pacific blue marlin and South Atlantic swordfish were assessed using an age-structured production model (ASPM). Results show that the status of Pacific blue marlin was fully exploited (S/SMSY = 1.00) and currently slightly overfishing (F/FMSY = 1.22). The swordfish in the South Atlantic Ocean was assessed to be overfished (S/SMSY = 0.89), but not overfishing (F/FMSY = 0.79). Assessment results for both species in this study suggest that these two stocks should be monitored closely.
計畫編號 102農科-11.1.1-漁-F3(1)
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