Abstract
The amphidromous sculpin Cottus pollux small-egg type (SE) is an endemic species in rivers that flow into the Pacific Ocean on the east side of Honshu Island, Japan. However, our molecular genetic and morphological analyses using recently collected specimens showed that C. pollux SE inhabits some rivers flowing into the Sea of Japan, where this species is originally non-indigenous. Thus, these results suggest that C. pollux SE was anthropogenically introduced into these rivers. In addition, our data on the size distribution of juvenile fishes suggest that non-indigenous C. pollux SE reproduce at least in rivers of Ishikawa Prefecture.
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We thank Hokuto Shirakawa, Masahito Higuchi, and Ei Kawahara for their help in collecting samples.
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Tsukagoshi, H., Sakai, K., Yamamoto, K. et al. Non-indigenous amphidromous sculpin Cottus pollux small-egg type (Teleostei: Cottidae) detected in rivers entering the Sea of Japan off Honshu Island, Japan. Ichthyol Res 60, 93–97 (2013). https://doi.org/10.1007/s10228-012-0316-9
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DOI: https://doi.org/10.1007/s10228-012-0316-9