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研究報告

更新日期: 2015-02-09
點閱數: 1,176

印度洋旗魚類以及南方黑鮪資源研究

年度 2013
計劃名稱 印度洋旗魚類以及南方黑鮪資源研究
中文摘要     本研究之目的在於進行印度洋紅肉旗魚與黑皮旗魚之CPUE標準化分析以及資源評估之分析,紅肉旗魚之標準化CPUE自1980年代開始則呈現大幅減少的趨勢,而黑皮旗魚之標準化CPUE皆顯示自1980年代中期開始減少,雖然1990年代呈現增加趨勢,但隨後又逐年減少,近年來則為大幅增加。根據評估結果皆指出目前(2011年)印度洋紅旗魚之漁獲死亡率已出皆高於MSY水準,而生物量評估結果也低於MSY水準,因此印度洋紅肉旗魚的資源現況相當不理想,在黑皮旗魚方面,資源評估結果指出目前(2011年)並未顯示印度洋黑皮旗魚資源狀態已處於過漁現象。然而,採用不同之CPUE序列其資源評估結果具有相當大的差異,因此目前之資源評估結果可能存在高度的不確定性。 此外,本研究亦採用台灣南方黑鮪之兩大漁區及CCSBT統計漁區所進行南方黑鮪之CPUE標準化分析。根據CCSBT統計漁區之結果顯示,不同漁區之CPUE變動趨勢差異甚大。然而,台灣之漁船作業分布與漁獲分布趨勢會被CCSBT統計漁區劃分為多個區塊,因此CCSBT統計漁區可能並不適用於進行台灣南方黑鮪漁獲資料之分析,未來應再根據各漁業國之漁獲特性,重新分析及義統計漁區。
英文摘要  The objective of this study is to carry out the CPUE standardizations and preliminary stock assessments for striped marlin and blue marlin in the Indian Ocean. Standardized CPUEs of striped marlin reveals substantial decline since 1980. Standardized CPUE of blue marlin deceased since mid-1980s, revealed increasing trends during 1990s but they gradually decreased for recent years. Based on the results of stock assessments, the stock status of striped marlin might be very pessimistic, current (2011) fishing mortality might be higher than MSY level and current biomass might be lower than MSY level. The stock status of blue marlin might be relatively optimistic. However, different CPUE series might result in significantly diverse assessment results and thus current assessment results are very uncertain. In addition, this study also carried out CPUE standardization for southern bluefin tuna. The CPUE standardization is performed based on the sub-area effect of either CCSBT statistical areas or Taiwanese SBT fishing ground. Standardized CPUEs generally reveal quite different trends for different area. It is apparent that the CCSBT statistical areas are not appropriate for Taiwanese SBT fleet since the main fishing grounds are separated into several parts by CCSBT statistical areas. It would be helpful to redefine CCSBT statistical areas for Taiwanese SBT fishery according to the temporal and spatial analysis of its fishing characters.
計畫編號 102農科-11.1.1-漁-F3(2)
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