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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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Please use this identifier to cite or link to this item:http://hdl.handle.net/2115/48313

Title: Cost-effective accurate estimates of adult chum salmon, Oncorhynchus keta, abundance in a Japanese river using a radio-controlled helicopter
Authors: Kudo, Hideaki Browse this author →KAKEN DB
Koshino, Yousuke Browse this author
Eto, Akihiro Browse this author
Ichimura, Masaki Browse this author
Kaeriyama, Masahide Browse this author →KAKEN DB
Keywords: Chum salmon
Aerial census
Radio-controlled helicopter
Salmon escapement
Salmon abundance
Issue Date: May-2012
Publisher: Elsevier
Journal Title: Fisheries Research
Volume: 119-120
Start Page: 94
End Page: 98
Publisher DOI: 10.1016/j.fishres.2011.12.010
Abstract: 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.
Type: article (author version)
URI: http://hdl.handle.net/2115/48313
Appears in Collections:水産科学院・水産科学研究院 (Graduate School of Fisheries Sciences / Faculty of Fisheries Sciences) > 雑誌発表論文等 (Peer-reviewed Journal Articles, etc)

Submitter: 工藤 秀明

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