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研究報告

更新日期: 2015-02-09
點閱數: 1,315

我國在三大洋混獲鯊魚資源風險評估

年度 2013
計劃名稱 我國在三大洋混獲鯊魚資源風險評估
中文摘要 生態風險評估(Ecological risk assessment) 在生物學數據不足的情況下,是一種有效用以評估物種所承受之風險程度的方法。此方法主要是依據生產力及敏感性兩項參數;生產力即物種在捕撈所能夠承受之恢復能力,利用族群內部增加率法進行估算;敏感性為物種可能受到漁業的影響程度,利用可得性、遭遇性、選擇性和捕獲後死亡率估算。生態風險評估風險最高為平滑白眼鮫,最低為鋸峰齒鮫。本研究使用整合性生態風險評估探討漁業對大西洋常見之8種大型鯊魚資源的影響,其中包含生態風險評估(ERA)、鯊魚物種瀕危狀態(C)以及漁獲體型變化趨勢指標(S)等三項指標,以群集分析(CA)及多元尺度分析(MDS)進行整合性生態風險評估的結果,可將8種鯊魚區分為四群,承受風險最高的平滑白眼鮫為第一群;紅肉丫髻鮫承受的風險次之為第二群;第三群為丫髻鮫、深海狐鮫、灰鯖鮫、污班白眼鮫及高鰭白眼鮫;而承受風險最低的鋸峰齒鮫為第四群。建議風險最高的兩群應實施較嚴格之管理措施;其次者應減少漁獲壓力;風險最低者應持續監控以確保鯊魚資源永續利用。  
英文摘要 Ecological risk assessment is an efficient method which can be used to evaluate the risk of fish species when its biological information is insufficient. This method is based on two parameters: productivity and susceptibility. The intrinsic population growth ratewas used to culculate the productivity. The susceptibility was calculated by the availability, encounterability, selectivity and post-capture mortality. The Silky shark had the highest ecological risk while the blue shark had the lowest. This study used an integrated risk assessment including three indices: ecological risk assessment, CITES endanger status, and the trend of body weight change to evaluate the risk of overexploitation for 8 pelagic shark species in the Atlantic Ocean. The results of cluster analysis and multi-dimensional scaling analysis indicated that the Silky shark (Carcharhinus falciformis) has the highest risk (group I), followed by the Scalloped hammerhead (Sphyrna lewini) (group II); while the Smooth hammerhead (S. zygaena), Bigeye thresher shark (Alopias superciliosus), Shortfin mako (Isurus oxyrinchus), Oceanic whitetip shark( C. longimanus), Sandbar shark( C. plumbeus) had moderate risk (group III); the blue shark(Prionace glauca) had the least risk of overexploitation (group IV). A rigorous management measure was recommended for the two highest risk groups; setting total allowable catch quota was proposed for the median risk group; a consistent monitoring was suggested for the least risk species.
計畫編號 102農科-11.1.1-漁-F6(4)
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