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Hokkaido University Collection of Scholarly and Academic Papers >
Graduate School of Fisheries Sciences / Faculty of Fisheries Sciences >
Peer-reviewed Journal Articles, etc >
Cost-effective accurate estimates of adult chum salmon, Oncorhynchus keta, abundance in a Japanese river using a radio-controlled helicopter
| 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)
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Submitter: 工藤 秀明
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