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研究報告

更新日期: 2015-02-09
點閱數: 1,286

南大西洋長鰭鮪資源評估研究

年度 2013
計劃名稱 南大西洋長鰭鮪資源評估研究
中文摘要 本研究將比較研析臺灣南大西洋鮪釣漁船作業所填報之logbook與觀察員資料。並將1982-2011年間臺灣南大西洋鮪釣漁船作業所填報之長鰭鮪漁獲體長資料,進行漁獲 體長年齡轉換,以估算長鰭鮪漁獲之年齡結構,進行資源補充量推估。再以GLM標準化1967-2011年我國大西洋長鰭鲔資源豐度指標(CPUE),分析南大西洋長鰭鮪漁獲變動與海洋環境變化之關聯。最後以年齡結構餘量模式,探討南大西洋長鰭鮪之資源現況、漁業資源最適利用策略並進行風險評估,作為資源管理之參考。計畫執行後,可獲得之俱體效益為對南大西洋長鰭鮪資源之合理永續利用提供重要之參考依據,並確保我國利用大西洋長鯺鮪資源之權益。  結果顯示:(1)由歷年之體長頻度與年齡頻度分布而言,將臺灣鮪釣漁船作業漁區分布分為3 subregion ,較北之subregion1與2體長年齡都較大,而南邊的subregion 3較小,且於subregion 1發現其中似乎可得循環現象,或許存在族群生物活動跡象(如產卵或遷徙)。(2)環境因子影響方面:溫度與對應該時空之平均體重而言有最大相關性,其相關係數達0.688,顯示高度相關,同樣的情形亦在葉綠素與該時空之長鰭鮪捕獲數目出現,而海水表層之鹽度與長鰭鮪資源量較無關係。(3)由1967年-20112之標準化CPUE Trend所示南大西洋長鰭鮪資源自1967年起呈現緩步下降趨勢,1990年代後有緩慢回升,但在1997年又緩慢下降至2003年達到最低水平,但自2003 年之後CPUE trend 之趨勢有緩步上升持平的情形,且GLM最強影響因子為漁區(4)ASPM模式顯示資源量每年24000噸為最佳管理標準,以2011年產卵親魚量(Spawning stock biomass, SSB2011) 為基礎,預估有50%風險水準5年內資源量可回復至MSY水準甚至更好的狀態。
英文摘要 This study will analyze the fishing logbook and observer data of Taiwanese tuna fishing vessels in South Atlantic Ocean. First transfer 1982-2001 Catch-at-size data into Catch-at-age to estimate age-structure and evaluate the recruitment of South Atlantic Albacore. And then use GLM to standardize CPUE trend, analyze the relation between Albacore catch and the marine environmental conditions. Finally, use Age Structured Production Model (ASPM) to assess the current stock status, find the optimal fishing strategy and implement risk analysis of South Atlantic albacore stock to provide crucial information of fishery management need. The results of this project will offer effective benefits for sustainably utilizing the South Atlantic albacore resources, ensuring the rights and interests of Taiwanese South Atlantic albacore fishery. The results obtained as follows: (1) Based on the dominancy of albacore in their different oceanic habitats, summarized and pictorically shown their size distribution characters respectively, there are 3 subregions in the South Atlantic ocean: in which big-size in the subregion 1&2,and small ones in the 3. And we found out there have been a circular fluctuations occurred in subregion 1 might imply some biological phenomena had arisen. (2) The most significantly related to sea surface temperature is average weights of albacore catch with a correlation coefficient 0.688,and to chlorophyll is the numbers of albacore catch with a correlation coefficient 0.707,however there is no significant relationship between salinity and all albacore catch factors.(3) According to the standardized CPUE trend ,we see a continuous decline from the beginning of Taiwanes longline fishery to 90s, then increase till the mid 90s, and leveled off since 2003 up to 2011.And factor “subregion” played the most important role in explanation of the model.(4) Evaluated by ASPM , with a the criteria 24,000mt as a constant TAC(Total allowable catch), we can assure that there appears a risk of smaller than 50% chance that the prospecting SSB/SSB2011 will reach the value always greater than 1 in-5years.
計畫編號 102農科-11.1.1-漁-F4(1)
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