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HandWiki. Japanese River Otter. Encyclopedia. Available online: https://encyclopedia.pub/entry/29796 (accessed on 24 September 2026).
HandWiki. Japanese River Otter. Encyclopedia. Available at: https://encyclopedia.pub/entry/29796. Accessed September 24, 2026.
HandWiki. "Japanese River Otter" Encyclopedia, https://encyclopedia.pub/entry/29796 (accessed September 24, 2026).
HandWiki. (2022, October 18). Japanese River Otter. In Encyclopedia. https://encyclopedia.pub/entry/29796
HandWiki. "Japanese River Otter." Encyclopedia. Web. 18 October, 2022.
Japanese River Otter
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The content is sourced from: https://handwiki.org/wiki/Biology:Japanese_river_otter

The Japanese river otter (Japanese: ニホンカワウソ(日本川獺 ー, Hepburn: Nihon-kawauso) (Lutra lutra whiteleyi) is an extinct variety of otter formerly widespread in Japan. Dating back to the 1880s, it was even seen in Tokyo. The population suddenly shrank in the 1930s, and the mammal nearly vanished. Since then, it has only been spotted several times, in 1964 in the Seto Inland Sea, and in the Uwa Sea in 1972 and 1973. The last official sighting was in the southern part of Kōchi Prefecture in 1979, when it was photographed in the mouth of the Shinjo River in Susaki. It was subsequently classified as a "Critically Endangered" species on the Japanese Red List. On August 28, 2012, the Japanese river otter was officially declared extinct by the Ministry of the Environment. It is the official animal symbol of Ehime Prefecture. In February 2017, a wild otter was caught on camera on Tsushima Island, Nagasaki Prefecture. However, it is not known whether the observed otter was a Japanese river otter.

river otter ニホンカワウソ日本川獺 otter

References

  1. Suzuki, Tomohiko; Yuasa, Hajime; Machida, Yoshihiko (1996). "Phylogenetic position of the Japanese river otter Lutra nippon inferred from the nucleotide sequence of 224 bp of the mitochondrial cytochrome b gene". Zoological Science 13 (4): 621–626. doi:10.2108/zsj.13.621. PMID 8940916.  https://dx.doi.org/10.2108%2Fzsj.13.621
  2. Yamamoto, K.; Ando, M. (2011). Trends in otter-related newspaper articles in Japan over 135 years (Report). Group Bulletin. 28. IUCN Otter Specialist. pp. 31–34. http://www.iucnosg.org/Bulletin/Volume28B/Yamamoto_Ando_2011.pdf. 
  3. Blundell, Gail M.; Ben-David, Merav; Bowyer, R. Terry (2002). "Sociality in river otters: cooperative foraging or reproductive strategies?". Behavioral Ecology 13 (1): 134–141. doi:10.1093/beheco/13.1.134.  https://dx.doi.org/10.1093%2Fbeheco%2F13.1.134
  4. "Japanese River Otter Facts". http://extinct-animals-facts.com/Recently-Extinct-Animal-Facts/Extinct-Japanese-River-Otter-Facts.html. 
  5. Mueller, Jennifer. "Extinct Otters". Demand Media. http://animals.pawnation.com/extinct-otters-6758.html. 
  6. ." id="ref_6">"Otter Reproduction." Otter Facts and Information. BioExpedition.com, n.d. Web. 24 Oct. 2014. .
  7. Motokazu, Ando (2012). Lake Biwa: Interactions between Nature and People. New York: Springer Dordrecht Heidelberg. pp. 141–142. ISBN 978-94-007-1782-4. 
  8. Epstein, Mike. "Japanese River Otter Declared Extinct After Three Decades". The Mary Sue. http://www.themarysue.com/japanese-otter-extinct/. 
  9. The Mainichi Shimbun. 2017. ニホンカワウソ ２００９年に目撃情報. Retrieved on April 12, 2017 https://mainichi.jp/articles/20170329/k00/00e/040/212000c
  10. Ehime Prefecture. ニホンカワウソ生息状況調査事業 調査概要（26 年度） (pdf). Retrieved on April 12, 2017 https://www.pref.ehime.jp/h25115/biodiversity/documents/26kawauso.pdf
  11. "Wild otter filmed alive in first Japan sighting since 1979". 17 August 2017. https://www.japantimes.co.jp/news/2017/08/17/national/wild-otter-thought-extinct-filmed-alive-first-japan-sighting-since-1979/. 
  12. Motokazu, Ando. "Extinction of Japanese River Otter". http://www.otterspecialistgroup.org/Library/Colloquium_10/Presentations/10-11-10-40_Ando.pdf. 
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