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Related Experiment Videos

How does tripus extirpation affect auditory sensitivity in goldfish?

Friedrich Ladich1, Lidia Eva Wysocki

  • 1Institute of Zoology, University of Vienna, Althanstrasse 14, 1090 Vienna, Austria. friedrich.ladich@univie.ac.at

Hearing Research
|September 2, 2003
PubMed
Summary

The Weberian ossicles significantly enhance hearing sensitivity in otophysine fishes. Removing these ossicles in goldfish causes substantial hearing loss, particularly at higher frequencies, demonstrating their crucial role in auditory perception.

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Area of Science:

  • Ichthyology
  • Auditory Neuroscience
  • Sensory Biology

Background:

  • Otophysine fishes possess unique Weberian ossicles linking the swimbladder to the inner ear.
  • These ossicles are hypothesized to play a critical role in auditory sensitivity.

Purpose of the Study:

  • To quantify the contribution of the tripus, a component of the Weberian ossicles, to auditory sensitivity in goldfish.
  • To investigate the effects of unilateral and bilateral tripus extirpation on hearing thresholds.

Main Methods:

  • Auditory evoked potential (AEP) recording technique was employed to measure hearing thresholds.
  • Tripus extirpation (unilateral and bilateral) was performed on goldfish.
  • Hearing sensitivity was assessed across frequencies from 100 to 4000 Hz.

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Main Results:

  • Bilateral tripus removal caused significant hearing loss across all tested frequencies (7-33 dB).
  • Unilateral tripus removal did not result in a measurable change in hearing sensitivity.
  • Goldfish with bilateral extirpation remained more sensitive than non-otophysine cichlids, suggesting alternative sound transmission pathways.

Conclusions:

  • The Weberian ossicles, specifically the tripus, are essential for high auditory sensitivity in otophysine fishes.
  • Sound transmission to the inner ear can occur partially independently of the ossicular chain, possibly via swimbladder oscillations.
  • The efficiency of the auditory system in otophysines increases with frequency due to the optimized swimbladder-inner ear connection facilitated by the Weberian ossicles.