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Hearing Assessment in Zebrafish During the First Week Postfertilization.

Qi Yao1,2, Alexandra A DeSmidt1, Mustafa Tekin2,3

  • 11 Department of Biology, University of Miami , Coral Gables, Florida.

Zebrafish
|March 17, 2016
PubMed
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Zebrafish (Danio rerio) hearing develops rapidly in the first week postfertilization. The saccule, not the utricle, is crucial for larval zebrafish auditory function.

Area of Science:

  • Neuroscience
  • Developmental Biology
  • Auditory Science

Background:

  • Zebrafish (Danio rerio) are a key vertebrate model for studying human hearing disorders due to their genetic accessibility and in vivo visualization capabilities.
  • Understanding early auditory development in zebrafish is crucial for modeling hearing impairments.

Purpose of the Study:

  • To investigate the auditory function development in zebrafish during the first week postfertilization.
  • To assess the role of the saccule and utricle in larval zebrafish hearing.
  • To validate the use of transgenic zebrafish for hearing studies.

Main Methods:

  • Auditory function was assessed using microphonic potential recordings in wild-type and transgenic zebrafish from 3 to 7 days postfertilization.
  • Acoustic stimulation was applied at frequencies ranging from 20 to 400 Hz.

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  • The impact of otolith displacement (saccule and utricle) on microphonic thresholds was evaluated.

    • Main Results:

    • Microphonic thresholds significantly decreased with age in zebrafish larvae, indicating developing hearing sensitivity.
    • No significant differences in microphonic responses were observed between wild-type and transgenic zebrafish.
    • Saccular otolith displacement significantly increased microphonic thresholds across all tested frequencies, while utricular otolith displacement only affected low frequencies.

    Conclusions:

    • Larval zebrafish exhibit significant auditory development within the first week postfertilization.
    • The saccule plays a primary role in larval zebrafish hearing, more so than the utricle.
    • Transgenic zebrafish lines used in this study possess normal hearing, validating their use in auditory research.