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Fish yawn: the state-change hypothesis in juvenile white-spotted char Salvelinus leucomaenis

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Title: Fish yawn: the state-change hypothesis in juvenile white-spotted char Salvelinus leucomaenis
Authors: Yamada, Hiroyuki Browse this author
Wada, Satoshi Browse this author →KAKEN DB
Keywords: Yawning
Mouth gaping
State-change hypothesis
Issue Date: 13-Jun-2024
Publisher: Springer
Journal Title: Journal of ethology
Publisher DOI: 10.1007/s10164-023-00777-2
Abstract: Yawning is a ubiquitous stereotyped action in vertebrates. Yawning may induce behavioral state changes in animals through its arousal function, but no studies have explicitly examined this state-change hypothesis in fish. This study examined the state-change hypothesis in juvenile white-spotted char, Salvelinus leucomaenis. We observed 48 yawns in 23 out of 41 juveniles during 600 s of observation in the laboratory. Thirty-two of these yawns occurred while juveniles were stationary on the substrate, and they were concentrated immediately before the behavioral transition from stationary to active. These results support the state-change hypothesis. Sixteen yawns were observed after the behavioral transition, and their durations were longer than those before the transition. Although we suspected that this prolonged yawning after the transition would be associated with feeding and thermoregulation in the juveniles, we could not determine the cause of this difference. Further studies are needed to understand fish yawning and the origin of animal yawning.
Rights: This version of the article has been accepted for publication, after peer review (when applicable) and is subject to Springer Nature’s AM terms of use, but is not the Version of Record and does not reflect post-acceptance improvements, or any corrections. The Version of Record is available online at:
Type: article (author version)
Appears in Collections:水産科学院・水産科学研究院 (Graduate School of Fisheries Sciences / Faculty of Fisheries Sciences) > 雑誌発表論文等 (Peer-reviewed Journal Articles, etc)

Submitter: 和田 哲

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