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Related Experiment Videos

Evidence for a peripheral olfactory memory in imprinted salmon

G A Nevitt1, A H Dittman, T P Quinn

  • 1Department of Zoology, University of Washington, Seattle 98195.

Proceedings of the National Academy of Sciences of the United States of America
|May 10, 1994
PubMed
Summary

Salmon olfactory memory retention is linked to peripheral olfactory receptors. Imprinted coho salmon showed enhanced sensitivity and behavioral preference for specific odorants, suggesting peripheral memory storage.

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Area of Science:

  • Neuroscience
  • Animal Behavior
  • Sensory Biology

Background:

  • Salmon exhibit remarkable homing abilities, primarily relying on olfactory cues for navigation.
  • The cellular mechanisms underlying olfactory memory and imprinting in salmon remain largely uncharacterized.

Purpose of the Study:

  • To investigate the role of peripheral olfactory receptors in retaining odorant-specific memories in coho salmon (Oncorhynchus kisutch).
  • To determine if imprinting during a critical developmental stage leads to lasting changes in olfactory receptor sensitivity.

Main Methods:

  • Coho salmon were imprinted to phenyl ethyl alcohol during parr-smolt transformation.
  • Peripheral olfactory receptor cell responses to phenyl ethyl alcohol and L-serine were measured using patch-clamp electrophysiology.

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  • Behavioral preference tests were conducted with imprinted and naive adult salmon in field experiments.

    • Main Results:

    • Peripheral olfactory receptor cells from imprinted salmon demonstrated significantly increased sensitivity to phenyl ethyl alcohol compared to naive fish.
    • This enhanced sensitivity was specific to the imprinted odorant, as sensitivity to L-serine did not differ significantly.
    • Field experiments confirmed that imprinted salmon exhibited a stronger behavioral preference for phenyl ethyl alcohol as adults.

    Conclusions:

    • Peripheral olfactory receptor cells play a role in the retention of imprinted olfactory memories in salmon.
    • These findings suggest that olfactory imprinting can induce lasting, peripheral cellular changes that support homestream navigation.