National Taiwan Ocean University Institutional Repository:Item 987654321/25110
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题名: Preliminary estimates of blue and mako sharks bycatch and cpue of Taiwanese longline fishery in the Atlantic Ocean
作者: Liu K. M.;W. P. Tsai;S. J. Joung
贡献者: NTOU:Institute of Marine Affairs and Resource Managemen
國立臺灣海洋大學:海洋事務與資源管理研究所
关键词: By-catch;sharks;catch/effort;longlining
日期: 2008
上传时间: 2011-10-20T08:21:18Z
出版者: ICCAT Shark Stock Assessment Meeting
摘要: This report was based on observers’ records of Taiwanese tuna longline fishing fleets operating in the Atlantic Ocean from 2002-2006. According to the shark by-catch rate, five areas, namely, A (5ºN-15ºS), B (15ºS-50ºS, west to 20ºW), C (15ºS-50ºS, 20ºW-20ºE), D (5ºN-20ºN) and E (north of 20ºN), were categorized. The shark catch data reported by observers were used to adjust the historical shark catch in Task I and to estimate the blue shark and mako shark catches of the Taiwanese longline fishery in the Atlantic Ocean. The shark by-catch in the tropical area (areas A and D) is higher than that in the temperate area (areas B, C, and E). Blue shark and mako shark are the dominant species of the shark by-catches in all areas. Shark by-catch in weight ranged from 1601 tons (1984) to 12872 tons (1996) in the South Atlantic Ocean, and ranged from 196 tons (1989) to 3066 tons (1994) in the North Atlantic Ocean. Blue shark by-catch in weight peaked in 1996 at 11628 tons in the South Atlantic Ocean and in 1994 at 2684 tons in the North Atlantic Ocean. The results in this study are preliminary and further investigation is needed.
關聯: SCRS期2008期153期
URI: http://ntour.ntou.edu.tw/handle/987654321/25110
显示于类别:[海洋事務與資源管理研究所] 演講及研討會

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