Abstract
Antipredator behavior of the paralarval stages of merobenthic octopuses is largely unknown. Reported here is an investigation of the behavioral response of Octopus sinensis paralarvae to the sympatric predator fish Girella punctata. Fishes of this species exhibited predatory behavior by engulfing individual paralarvae, but most fishes almost immediately rejected the paralarva from the mouth. No paralarvae died after being engulfed and ejected. The number of such temporary engulfings of a paralarva by a fish during the test period (10 min) decreased with the increase in the number of times a paralarva was engulfed. The frequency of engulfing attacks by the fish also declined. The paralarvae did not eject ink before being engulfed, but 43% of the paralarvae exhibited inking immediately after ejection from the fish’s mouth. The fishes ingested the ink masses released by the paralarvae, and the proportion of fish ingesting the ink masses increased with increasing experience of encountering the ink. When the paralarvae ejected ink, the time interval between first engulfing and subsequent engulfing increased, apparently in relation to distraction of the fish by the ink. These results suggest that paralarvae have an antipredatory mechanism which causes predatory fish to eject them after they have been engulfed. In addition, the paralarvae use the stimulus of being ejected from the mouth of a fish as a cue for ink ejection. The ink mass may be attractive to the fish as a food item because of its potential action as a phagomimetic distraction, enabling the paralarvae to escape.
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Acknowledgements
We thank Kei Yamamoto, Takanari Iwata, Saki Fujiwara, and Zen Yamada for helping with sample collection, and Ian G. Gleadall (AiCeph LLC, Sendai) for assistance in preparing the manuscript and valuable advice. We are also grateful to the editors and anonymous reviewers for valuable comments and suggestions, which have improved the manuscript.
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This research was supported by the research program on development of innovative technology grants from the Project of the Bio-oriented Technology Research Advancement Institution (BRAIN) under Grant Number JPJ007097.
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Conceptualization: SD, KH, methodology: SD, MY, formal analysis and investigation: SD, MY, KH, writing—original draft preparation: SD, writing—review and editing: KH, YK, KS, resources: YK, KS, SD, MY.
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Dan, S., Yamaji, M., Kamei, Y. et al. Antipredator strategy of paralarvae of East Asian common octopus Octopus sinensis d’Orbigny, 1841: causing rejection after engulfing by a fish, and subsequent ink release for distraction during escape. Mar Biol 170, 109 (2023). https://doi.org/10.1007/s00227-023-04250-z
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DOI: https://doi.org/10.1007/s00227-023-04250-z