Abstract
Freshwater sculpin dwelling in Lake Chuzenji, Nikko, Kanto District, Japan, was identified as the lacustrine type of Cottus reinii, Utsusemikajika, by using a combination of pectoral fin ray counts (15–17, mode 16), mitochondrial DNA variations and egg size (1.33 ± 0.06 mm). We suppose that C. reinii in Lake Chuzenji was introduced unintentionally from Lake Biwa along with either Oncorhynchus masou subsp. or Sarcocheilichthys variegatus microoculus during the late nineteenth to early twentieth centuries. This is the first report of an establishment of the lacustrine type of C. reinii outside of Lake Biwa.
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Acknowledgments
We thank Yuhei Kanzawa, Takeshi Kikko, Arimune Munakata, Tsutomu Okabe, Machi Yamamoto and the Kuji River Fishermen’s Cooperative for providing sculpin samples. The authors also thank Koji Muto and the staff of the Lake Chuzenji Fishermen’s Cooperative for providing information about the sculpin in Lake Chuzenji, Akira Goto and Hideharu Tsukagoshi for providing information about the biology of the Cottus pollux species complex, Kouta Miyamoto for providing the photograph of the sculpin from Lake Chuzenji, and Tomoko Harazaki, Ayako Kondo and Maki Yoshida for their assistance with the DNA analyses. We are grateful to two anonymous reviewers whose comments have greatly improved the manuscript. This study was supported in part by the Fisheries Agency, Ministry of Agriculture, Forestry and Fisheries, to SY, and MEXT/JSPS Grants-in-aid for Scientific Research no. 22570082 to RY.
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Yokoyama, R., Yamamoto, S. Freshwater sculpin dwelling in Lake Chuzenji, Nikko, Kanto District, Japan, is identified as Utsusemikajika, Cottus reinii, unintentionally introduced from Lake Biwa. Ichthyol Res 59, 389–393 (2012). https://doi.org/10.1007/s10228-012-0298-7
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DOI: https://doi.org/10.1007/s10228-012-0298-7