Abstract
Telemetry is a useful technique for elucidating salmon behavior, but the recovery periods before fish can be safely released after the attachment of telemetry devices have not yet been established. Reported recovery times vary widely, from 2 h to 13 days. We examined how anesthesia and surgery to attach external electromyogram (EMG) transmitters affected chum salmon (Oncorhynchus keta) recovery based on three physiological parameters. Fish subjected to anesthesia plus EMG transmitter attachment (EMG group), anesthesia only (AO group), and no handling (control) were placed in a swim tunnel. Critical swimming speed (U crit), oxygen consumption (MO2), and muscle activity (EMG values) were assessed 0, 1, 6, 12, 24, and 30 h after treatment. The MO2 in the EMG and AO groups was higher than in the control group 1 h after treatment, but did not differ significantly from the control in all subsequent trials (from 6 to 30 h after treatment). Values for U crit and EMG were not significantly different from the control group in any of the trials conducted 1–30 h after treatment. We concluded that chum salmon had regained their normal swimming ability by 6 h after treatment and could be safely released into the natural environment.
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Acknowledgments
The authors thank A. Hirayama for comments on the study design; M. Kubo for advice about statistical techniques; M. Kikuchi for input on the selection of the experimental site; Chitose Salmon Aquarium and Chitosegawa River Office for access to the experimental site; and the Sea of Japan Salmon Propagative Association for providing fish for the experiments.
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Hayashida, K., Nii, H., Tsuji, T. et al. Effects of anesthesia and surgery on U crit performance and MO2 in chum salmon, Oncorhynchus keta . Fish Physiol Biochem 39, 907–915 (2013). https://doi.org/10.1007/s10695-012-9750-x
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DOI: https://doi.org/10.1007/s10695-012-9750-x