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Temperature-dependent gastric evacuation rate of the Japanese delicate loach Niwaella delicata (Cobitidae)

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Abstract

The gastric evacuation rate (GER) of the delicate loach Niwaella delicata was estimated experimentally under four temperature conditions (10, 15, 20, and 25 °C). The GER was relatively high under the ≥20 °C condition and was nearly zero under the ≤15 °C condition. The relationship between GER and water temperature was estimated following the method of Elliot (1972) as follows: GER = exp (0.436 × temperature − 10.59). This physical characteristic might affect the seasonal activity of this species.

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Acknowledgements

I thank Dr. Takuya Sato and Hiroshi Matsuo for helping with the experiments, and staff of the Asiu Forest Research Station, Kyoto University for kind cooperation. This study was funded by the Sumitomo foundation. All sampling and experimental procedures of this study were performed in accordance with the “Guidelines for the Use of Fishes in Research” published by the Ichthyological Society of Japan in 2003 (http://www.fish-isj.jp/english/guidelines.html).

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  1. Field Science Education and Research Center, Kyoto University, Onojya, Ashiu, Miyama, Nantan, Kyoto, 601-0703, Japan

    Hikaru Nakagawa

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  1. Hikaru Nakagawa
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Correspondence to Hikaru Nakagawa.

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Nakagawa, H. Temperature-dependent gastric evacuation rate of the Japanese delicate loach Niwaella delicata (Cobitidae). Ichthyol Res 65, 172–174 (2018). https://doi.org/10.1007/s10228-017-0599-y

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  • DOI: https://doi.org/10.1007/s10228-017-0599-y

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