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The Welfare of Fish pp 129–148Cite as

Fish Brains: Anatomy, Functionality, and Evolutionary Relationships

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Part of the book series: Animal Welfare ((AWNS,volume 20))

Abstract

In this chapter, we provide an overview of the anatomy, functionality, and evolution of the fish nervous system. Our focus will be on the brain in the vertebrate group with the greatest variation in brain form and function, the actinopterygian bony fishes. We first describe central (CNS) and autonomic (ANS) nervous systems and then characterize the major distal components of the CNS (spinal cord, spinal nerves, cranial nerves), before we summarize the brain regions and their connections and highlight some similarities and differences between different fish taxa. The second part of this chapter is devoted to variation in fish brain anatomy, including a discussion of comparative brain anatomy evolution and brain plasticity. We finish with a summary of the evolutionary costs and benefits of brain size based on results in guppies (Poecilia reticulata) artificially selected for large and small brains. With respect to fish welfare, we conclude that their great brain diversity reflects the diverse cognitive needs of fishes. However, their lifelong high rates of neurogenesis should also make individuals capable to cognitively adapt to a certain range of environmental conditions.

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Authors and Affiliations

  1. Zoological Institute, Stockholm University, Stockholm, Sweden

    Alexander Kotrschal

  2. Behavioural Ecology, Insitute of Animal Sciences, Wageningen University, Wageningen, Netherlands

    Alexander Kotrschal

  3. Department of Behavioural Biology, University of Vienna, Wien, Austria

    Kurt Kotrschal

  4. Konrad Lorenz Forschungsstelle, University of Vienna, Grünau, Austria

    Kurt Kotrschal

  5. Wolf Science Center, University of Veterinary Medicine, Ernstbrunn, Austria

    Kurt Kotrschal

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  1. Alexander Kotrschal
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Correspondence to Alexander Kotrschal .

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Editors and Affiliations

  1. Institute of Marine Research, Bergen, Norway

    Tore S. Kristiansen

  2. Department of Biological Sciences, University of Bergen, Bergen, Norway

    Anders Fernö

  3. Department of Biology, University of Crete, Heraklion, Greece

    Michail A. Pavlidis

  4. IMARES, Wageningen University & Research Centre, YERSEKE, The Netherlands

    Hans van de Vis

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Kotrschal, A., Kotrschal, K. (2020). Fish Brains: Anatomy, Functionality, and Evolutionary Relationships. In: Kristiansen, T., Fernö, A., Pavlidis, M., van de Vis, H. (eds) The Welfare of Fish. Animal Welfare, vol 20. Springer, Cham. https://doi.org/10.1007/978-3-030-41675-1_6

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