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Research Article
Angling gear avoidance learning in juvenile red sea bream: evidence from individual-based experiments
Kohji Takahashi, Reiji Masuda
Journal of Experimental Biology 2021 224: jeb239533 doi: 10.1242/jeb.239533 Published 24 February 2021
Kohji Takahashi
Maizuru Fisheries Research Station, Kyoto University, Maizuru, Kyoto 625-0086, Japan
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  • For correspondence: ta.kohji@gmail.com
Reiji Masuda
Maizuru Fisheries Research Station, Kyoto University, Maizuru, Kyoto 625-0086, Japan
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ABSTRACT

Angling gear avoidance learning is a possible factor that contributes to the vulnerability of caught-and-released fish to angling. Whereas past studies suggested angling gear avoidance learning, they were based on large-scale experiments on groups of fish and unable to verify learning accurately. Details of avoidance learning are also unclear. The present study investigated angling gear avoidance learning through a series of individual-based experiments using red sea bream (Pagrus major) juveniles. Fish avoided angling gear after only one or two catches while showing feeding motivation for pellets, representing avoidance learning for angling gear. Most of the experienced fish avoided krill attached to a fishing line, but not krill alone or pellets presented near the angling gear. Experienced fish were less vulnerable to angling than control fish. Approximately half of the experienced fish kept the memory of angling gear 2 months after learning. The learning effect through the catch-and-release procedure would reduce catchability and the value of fishery-dependent stock assessments.

Footnotes

  • Competing interests

    The authors declare no competing or financial interests.

  • Author contributions

    Conceptualization: K.T.; Methodology: K.T.; Validation: K.T.; Formal analysis: K.T.; Investigation: K.T.; Writing - original draft: K.T.; Writing - review & editing: R.M.; Supervision: R.M.; Funding acquisition: K.T.

  • Funding

    The present study was funded by a Grant-in-Aid from the Japan Society for the Promotion of Science for Fellows and Early-Career Scientists (KAKENHI 18K14512).

  • Data availability

    Data are available from the figshare digital repository: https://doi.org/10.6084/m9.figshare.13499412.v1

  • Received October 18, 2020.
  • Accepted January 21, 2021.
  • © 2021. Published by The Company of Biologists Ltd
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Keywords

  • Fishing
  • Catch and release
  • Cognitive ecology
  • Conditioning
  • Memory
  • Preparedness

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Research Article
Angling gear avoidance learning in juvenile red sea bream: evidence from individual-based experiments
Kohji Takahashi, Reiji Masuda
Journal of Experimental Biology 2021 224: jeb239533 doi: 10.1242/jeb.239533 Published 24 February 2021
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Research Article
Angling gear avoidance learning in juvenile red sea bream: evidence from individual-based experiments
Kohji Takahashi, Reiji Masuda
Journal of Experimental Biology 2021 224: jeb239533 doi: 10.1242/jeb.239533 Published 24 February 2021

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