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Environmental Biology of Fishes

, Volume 101, Issue 3, pp 383–401 | Cite as

Rearing environment influences boldness and prey acquisition behavior, and brain and lens development of bull trout

  • William R. Brignon
  • Martin M. Pike
  • Lars O. E. Ebbesson
  • Howard A. Schaller
  • James T. Peterson
  • Carl B. Schreck
Article

Abstract

Animals reared in barren captive environments exhibit different developmental trajectories and behaviors than wild counterparts. Hence, the captive phenotypes may influence the success of reintroduction and recovery programs for threatened and endangered species. We collected wild bull trout embryos from the Metolius River Basin, Oregon and reared them in differing environments to better understand how captivity affects the bull trout Salvelinus confluentus phenotype. We compared the boldness and prey acquisition behaviors and development of the brain and eye lens of bull trout reared in conventional barren and more structurally complex captive environments with that of wild fish. Wild fish and captive reared fish from complex habitats exhibited a greater level of boldness and prey acquisition ability, than fish reared in conventional captive environments. In addition, the eye lens of conventionally reared bull trout was larger than complex reared captive fish or same age wild fish. Interestingly, we detected wild fish had a smaller relative cerebellum than either captive reared treatment. Our results suggest that rearing fish in more complex captive environments can create a more wild-like phenotype than conventional rearing practices. A better understanding of the effects of captivity on the development and behavior of bull trout can inform rearing and reintroduction programs though prediction of the performance of released individuals.

Keywords

Boldness behavior Behavioral development Behavioral plasticity Brain development Eye development Species conservation Species recovery Bull trout 

Notes

Acknowledgments

The authors declare no conflict of interest. We would like to thank Dr. Jeffrey Jolley, Greg Silver, Dr. Kari Dammerman, Dr. Robert Mason, Dr. Jason Dunham, and Dr. Jacob Raber for thoughtful reviews of the manuscript. Dr. Matt Mesa provided productive discussion on study design. Rob Chitwood, Olivia Hakanson, and Rachel Palmer provided animal husbandry. References to trade names do not imply endorsement by the U.S. Government. The findings and conclusions in this manuscript are those of the author and do not necessarily represent the views of the U.S. Fish and Wildlife Service.

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Copyright information

© Springer Science+Business Media B.V., part of Springer Nature 2017

Authors and Affiliations

  • William R. Brignon
    • 1
    • 2
  • Martin M. Pike
    • 3
  • Lars O. E. Ebbesson
    • 4
  • Howard A. Schaller
    • 5
  • James T. Peterson
    • 2
  • Carl B. Schreck
    • 2
  1. 1.Columbia River Fisheries Program OfficeUnited States Fish and Wildlife ServiceVancouverUSA
  2. 2.U.S. Geological Survey, Oregon Cooperative Fish and Wildlife Research Unit, U.S.G.S.Oregon State UniversityCorvallisUSA
  3. 3.Advanced Imaging Research CenterOregon Health and Science UniversityPortlandUSA
  4. 4.Uni Research EnvironmentUniversity of BergenBergenNorway
  5. 5.Fish and Aquatic Conservation ProgramUnited States Fish and Wildlife ServicePortlandUSA

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