A Proposed Mechanism for the Observed Ontogenetic Improvement in the Hearing Ability of Hapuka (Polyprion Oxygeneios)

Overview

Journal J Comp Physiol A Neuroethol Sens Neural Behav Physiol

Publisher Springer

Specialties Neurology
Social Sciences

Date 2013 Apr 26

PMID 23615768

Citations 1

Authors

P E Caiger

J C Montgomery

M Bruce

J Lu

C A Radford

Affiliations

Soon will be listed here.

Abstract

Swim bladder extensions and hearing ability were examined in the temperate reef fish Polyprion oxygeneios (hapuka). Using the auditory evoked potential (AEP) technique, hearing thresholds were determined in four age-classes of hapuka, from larvae to juveniles. The youngest age-class had poor hearing abilities, with lowest thresholds of 132 dB re 1 μPa, and a narrow auditory bandwidth (100-800 Hz). Hearing ability improved significantly throughout the remainder of their first year, including decreases in thresholds of up to 27 dB, and an increase in auditory bandwidth (up to 1,000 Hz). Magnetic resonance imaging (MRI) was used to investigate structural mechanisms that may account for this ontogenetic improvement in hearing. These showed rostral extensions of the swim bladder developing early in the juvenile stage, and extending with increasing age closer to the otic capsule. It is suggested that this indirect connection between the swim bladder and the otic capsule could impart pressure sensitivity closer to the inner ear, accounting for the increase in sensitivity seen during development, although further investigation of older fish is required for conclusive evidence. The improvement in hearing ability in hapuka could be potentially related to a unique life history of extended pelagic durations up to 4 years.

Citing Articles

Ocean acidification effects on fish hearing.

Radford C, Collins S, Munday P, Parsons D Proc Biol Sci. 2021; 288(1946):20202754.

PMID: 33653144 PMC: 7935027. DOI: 10.1098/rspb.2020.2754.

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