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Cost-effective accurate estimates of adult chum salmon, Oncorhynchus keta, abundance in a Japanese river using a radio-controlled helicopter

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この文献へのリンクには次のURLを使用してください:http://hdl.handle.net/2115/48313

タイトル: Cost-effective accurate estimates of adult chum salmon, Oncorhynchus keta, abundance in a Japanese river using a radio-controlled helicopter
著者: Kudo, Hideaki 著作を一覧する
Koshino, Yousuke 著作を一覧する
Eto, Akihiro 著作を一覧する
Ichimura, Masaki 著作を一覧する
Kaeriyama, Masahide 著作を一覧する
キーワード: Chum salmon
Aerial census
Radio-controlled helicopter
Salmon escapement
Salmon abundance
発行日: 2012年 5月
出版者: Elsevier
誌名: Fisheries Research
巻: 119-120
開始ページ: 94
終了ページ: 98
出版社 DOI: 10.1016/j.fishres.2011.12.010
抄録: This paper describes an attempt in 2008 to establish an aerial census of adult chum salmon using a small radio-controlled (RC) helicopter. The Moheji River, located in southern Hokkaido, was chosen because all the salmon in a stretch of the river between a weir and the estuary are seine-netted every morning for artificial propagation. Aerial photographs of the river were taken from a RC helicopter equipped with a digital single-lens reflex camera and polarized filter. To quantify salmon density within the census area, the number of salmon per aerial photograph was counted using image-processing software. Salmon could be clearly identified in photographs taken from an altitude of ∼30 m. Salmon numbers estimated by aerial census and seine-netting were significantly related. The results indicate that a small RC helicopter can be used to generate adult salmon abundance data in Japanese rivers.
資料タイプ: article (author version)
URI: http://hdl.handle.net/2115/48313
出現コレクション:雑誌発表論文等 (Peer-reviewed Journal Articles, etc)

提供者: 工藤 秀明

 

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