Abstract
The strontium and calcium concentration ratios in the otoliths of Rhinogobius sp. TO collected from the river flowing from a pond of Aichi Expo Park, a waterway from the Yahagi and Kushida Rivers and the Yahagifuru River, Japan, were studied to confirm the presence or absence of sea migrating traits during the larval period. The ratios of all samples showed consistently low ratios from the core to the edge, suggesting that the Rhinogobius sp. TO has a freshwater resident lifestyle. Therefore, conservation of river ecosystems is essential to protect the natural populations of this goby.
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Acknowledgments
We would like to thank Ms. M. Otsuki (Ocean Research Institute, The University of Tokyo) for assistance with the chemical analysis of Ca and Sr. We are grateful to Mr. K. Arao (Environmental Science Laboratory) for offering us samples. This work was supported in part by Grant-in-Aid No. 20688008 from the Ministry of Education, Culture, Sports, Science and Technology of Japan.
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Tsunagawa, T., Suzuki, T. & Arai, T. Otolith Sr:Ca ratios of freshwater goby Rhinogobius sp. TO indicating absence of sea migrating traits. Ichthyol Res 57, 319–322 (2010). https://doi.org/10.1007/s10228-010-0158-2
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DOI: https://doi.org/10.1007/s10228-010-0158-2