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Evolutionary changes in cognition due to fisheries mortality?

Tamal Roy1, Alexander Kotrschal2, Robert Arlinghaus1

  • 1Division of Integrative Fisheries Management, Albrecht-Daniel-Thaer Institute of Agricultural and Horticultural Sciences, Faculty of Life Sciences, Humboldt-Universität zu Berlin, Philippstrasse 13, Haus 7, 10115 Berlin, Germany; Department of Fish Biology, Fisheries and Aquaculture, Leibniz Institute of Freshwater Ecology and Inland Fisheries, Müggelseedamm 310, 12587 Berlin, Germany; Science of Intelligence, Research Cluster of Excellence, Marchstrasse 23, 10587 Berlin, Germany.

Trends in Ecology & Evolution
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Harvested fish may evolve faster life histories, sacrificing brain energy for reproduction. This can lead to reduced cognitive abilities in fish populations, impacting fisheries quality.

Keywords:
boldnessbrainfisheries-induced evolutionlearning and memorylife-history

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Area of Science:

  • Evolutionary biology
  • Fisheries science
  • Neuroscience

Background:

  • Harvest mortality can drive evolutionary changes in fish populations.
  • Fast life-history strategies prioritize current reproduction over future investment.
  • Energetic trade-offs may limit brain development in harvested fish.

Purpose of the Study:

  • To investigate how harvest-induced evolution affects fish cognitive abilities.
  • To understand the link between life-history evolution and brain investment.
  • To assess the impact of cognitive changes on fish populations and fisheries.

Main Methods:

  • Review of existing literature on fisheries-induced evolution and life-history theory.
  • Analysis of potential selective pressures on fish behavior and cognition.
  • Theoretical modeling of energetic allocation between reproduction and brain function.

Main Results:

  • Fisheries may select for fast life histories, reducing energy for brain development.
  • Evolutionary pressures can favor shy or less cognitively capable individuals.
  • Altered cognitive performance can result from harvest-induced evolutionary changes.

Conclusions:

  • Harvest mortality can lead to evolutionary shifts that impair fish cognition.
  • These cognitive changes can negatively affect individual fish and overall fish populations.
  • Understanding these evolutionary impacts is crucial for sustainable fisheries management.