Environmental Biology of Fishes

, Volume 81, Issue 1, pp 77–86 | Cite as

Diel activity and reproductive territory of the Japanese bagrid catfish, Pseudobagrus ichikawai

  • Katsutoshi Watanabe
Original Paper


The endangered Japanese bagrid catfish, Pseudobagrus ichikawai, is typically nocturnal, emerging from shelters, such as crevices along the shore, at sunset to actively forage in open areas throughout the night with short-term movements of up to 40 m (except for mature males). Just before sunrise, individuals return to their shelters, from which they rarely emerge in daytime. Mature males (3 years-of-age or older) are found only in the vicinity of their shelters of during both day and night, which they defend with strong territorial behaviour. The restricted reproductive resources (shelters) probably severely limit the population size and reproduction in this species.


Nocturnal Shelter Home range Siluriformes Bagridae 



I sincerely thank the late S. Watanabe and his family, and S. Ando for their help during the field work, S. Mori, M. Nagoshi and Y. Taki for invaluable advice and discussion, and the Fisheries’ Union of the Upper Reaches of the Tsubo River, the Board of Education of Minokamo City and Gifu Prefecture, and the Japanese National Agency for Cultural Affairs for providing permission for the study.


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Copyright information

© Springer Science+Business Media, Inc. 2006

Authors and Affiliations

  1. 1.Laboratory of IchthyologyTokyo University of FisheriesMinato, TokyoJapan
  2. 2.Department of ZoologyGraduate School of Science, Kyoto UniversitySakyo, KyotoJapan

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