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Rearing environment affects spatial learning in juvenile Chinook salmon Oncorhynchus tshawytscha.

Karen M Cogliati1, Julia R Unrein1, Carl B Schreck1

  • 1Department of Fisheries and Wildlife, Oregon State University, Corvallis, Oregon, USA.

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|June 30, 2019
PubMed
Summary

A complex rearing environment did not improve spatial memory in juvenile Chinook salmon. Hatchery-raised fish showed better maze learning, possibly due to density and social cues, not habitat complexity.

Keywords:
captive-rearingcognitioncomplex structuredensityenvironmental enrichmenthatchery

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Area of Science:

  • Aquaculture
  • Animal Behavior
  • Ecology

Background:

  • Rearing environments can influence fish behavior and cognitive abilities.
  • Understanding spatial memory in juvenile fish is crucial for aquaculture and conservation.
  • Chinook salmon (Oncorhynchus tshawytscha) are a key species for ecological and economic reasons.

Purpose of the Study:

  • To test if a complex physical rearing environment enhances short-term spatial memory in juvenile Chinook salmon.
  • To compare learning ability in a spatial navigation task between fish reared in bare, complex, and conventional hatchery environments.

Main Methods:

  • Juvenile Chinook salmon were reared in low-density bare tanks, low-density complex tanks, and high-density hatchery tanks.
  • Individually marked fish were tested for seven days in a spatial maze task with social reinforcement.
  • Movement, time to exit, and learning (decrease in mistakes) were recorded.

Main Results:

  • Fish from the bare treatment were less likely to initiate the maze task.
  • Hatchery-reared fish were more likely to exit the maze and showed effective learning over trials.
  • Habitat complexity did not necessarily promote spatial learning; rearing density and social motivation likely influenced behavior.

Conclusions:

  • A complex physical rearing environment may not be the primary driver for enhanced spatial learning in juvenile Chinook salmon.
  • Differences in rearing density and social cues in conventional hatchery settings may promote better performance in spatial tasks.
  • Further research is needed to disentangle the effects of environmental complexity, density, and social factors on fish cognition.