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Does speaker presentation affect auditory evoked potential thresholds in goldfish?

Friedrich Ladich¹, Lidia Eva Wysocki

¹Department of Behavioural Biology, University of Vienna, Althanstrasse 14, 1090 Vienna, Austria. friedrich.ladich@univie.ac.at

Comparative Biochemistry and Physiology. Part A, Molecular & Integrative Physiology

|July 16, 2009

Summary

Auditory evoked potential (AEP) recordings in goldfish show that speaker type and fish position minimally impact hearing thresholds. Variations in AEP results are likely due to other factors like noise or calibration.

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Area of Science:

* Ichthyology
* Bioacoustics
* Auditory Neuroscience

Background:

* Auditory evoked potential (AEP) recording is a key technique for assessing fish auditory sensitivity.
* Previous studies utilized air speakers with fish at the water surface, yielding results close to behavioral data.
* Modifications in AEP protocols across labs necessitate investigating the impact of equipment and subject positioning on auditory threshold determination.

Purpose of the Study:

* To determine if speaker choice (air vs. underwater) and fish position (at or below the water surface) influence auditory threshold measurements in goldfish (Carassius auratus).
* To identify the primary factors contributing to discrepancies in AEP thresholds reported across different research laboratories.

Main Methods:

* Auditory thresholds of goldfish (Carassius auratus) were measured using an air speaker and an underwater speaker.

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* Fish were positioned alternately at the water surface and 5 cm below the surface.

* Hearing thresholds were recorded at 200 Hz, 500 Hz, and 1000 Hz.

Main Results:

* Mean hearing thresholds varied by 5.6 dB at 200 Hz, 3.7 dB at 500 Hz, and 4 dB at 1000 Hz across the four tested setups.
* The choice of speaker and fish position had a relatively small impact on the obtained auditory thresholds.

Conclusions:

* Differences in AEP thresholds for goldfish across studies are more likely attributable to variations in threshold definition, background noise levels, population specifics, or calibration errors, rather than speaker type or fish depth.
* Standardization of AEP recording protocols is crucial for reliable and comparable auditory sensitivity data in fishes.