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Spatial and temporal variation in the distribution of juvenile southern bluefin tuna Thunnus maccoyii: implication for precise estimation of recruitment abundance indices


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タイトル: Spatial and temporal variation in the distribution of juvenile southern bluefin tuna Thunnus maccoyii: implication for precise estimation of recruitment abundance indices
著者: Fujioka, Ko / Kawabe, Ryo / Hobday, Alistair J. / Takao, Yoshimi / Miyashita, Kazushi / Sakai, Osamu / Itoh, Tomoyuki
発行日: 2010年 5月
出版者: 日本水産学会
引用: Fisheries Science, 76(3), pp.403-410; 2010
抄録: Acoustic tags were used to examine the spatial and temporal distribution of southern bluefin tuna (SBT) in southern Western Australia, which is in a region where fishery-independent acoustic surveys of the recruitment abundance index of SBT have been historically undertaken. We investigated patterns of SBT distribution within and inshore of the acoustic survey area during three summer seasons. Annual differences in distribution patterns were characterized by two distinctive migration pathways. An inshore-migrating pathway was observed in two seasons (2004/2005 and 2006/2007), with a relatively high proportion of tagged SBT (84.5, 65.0%) migrating inshore of the acoustic survey area. The other pathway was concentrated along the shelf (2005/2006 season), with an estimated 63.3% of tagged SBT moving within the survey area. These variable migration patterns may bias the interannual fluctuations in abundance indices. Current survey methods can be modified to include both inshore and continental shelf areas. This contribution shows that the accuracy of acoustic surveys can be improved by including ecological patterns.
キーワード: Acoustic telemetry / Migratory pathway / Movement patterns / Recruitment abundance index / Residence time
URI: http://hdl.handle.net/10069/25189
ISSN: 09199268
DOI: 10.1007/s12562-010-0228-4
権利: © The Japanese Society of Fisheries Science 2010 / The original publication is available at www.springerlink.com
資料タイプ: Journal Article
原稿種類: author
出現コレクション:090 学術雑誌論文

引用URI : http://hdl.handle.net/10069/25189

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