Ichthyological Research

, Volume 56, Issue 3, pp 319–321 | Cite as

Sudden crash of a local population of the endangered bagrid catfish Pseudobagrus ichikawai

  • Katsutoshi Watanabe
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The bagrid catfish Pseudobagrus ichikawai is an endangered freshwater fish (EN in the Red Data Book of Japan; Ministry of the Environment 2003) and distributed only in a narrow region of central Honshu, Japan. The catfish inhabits the middle reaches of rivers in well-protected environments and thus is particularly susceptible to any introduced water pollution or human-made changes to habitat structure (Watanabe 1997; Kobayakawa 2003). Several studies have addressed the conservation (e.g., Watanabe and Mori 1998; Mori and Watanabe 1999) and basic ecology (e.g., Watanabe 1994, 2008; Tashiro et al. 2005) of this species. A long-term (>ten-year) study conducted in a tributary of the Nagara River system, Gifu Prefecture, indicated that the population of P. ichikawai fluctuates greatly, primarily because of changes in recruitment among years, likely to be because of regional or climatic factors such as rain-induced floods (Watanabe and Ichiyanagi 2006, unpublished data). Conservation...


Lower Section Habitat Unit Population Crash Gifu Prefecture Plecoglossus Altivelis 
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I thank the local fishermen’s cooperatives, S. Andoh, H. Murase, and the late S. Watanabe and his family for their help during the field study, and H. Ichiyanagi, S. Mori, K. Ohara, T. Tokuhara, N. Nakanishi, Y. Harada, T. Kikko, S. Ota, and A. Sakai for providing information.


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Copyright information

© The Ichthyological Society of Japan 2008

Authors and Affiliations

  1. 1.Department of Zoology, Division of Biological ScienceGraduate School of Science, Kyoto UniversitySakyo-kuJapan

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