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High intensity anthropogenic sound damages fish ears
Robert D McCauley1, Jane Fewtrell, Arthur N Popper
1Centre for Marine Science and Technology, Curtin University, GPO Box U 1987, Perth 6845, Western Australia. r.mccauley@cmst.curtin.edu.au
The Journal of the Acoustical Society of America
|February 1, 2003
Summary
Marine air-gun exploration causes severe ear damage in fish. Studies show ablated sensory hair cells in fish ears after air-gun exposure, with no signs of healing up to 58 days later.
Area of Science:
- Marine Biology
- Acoustic Ecology
- Oto-toxicology
Background:
- Marine petroleum exploration utilizes high-energy air-guns, producing low-frequency sound.
- Potential for air-gun noise to cause auditory damage in aquatic vertebrates is largely unknown.
- Observed behavioral responses in marine life suggest acoustic impacts.
Purpose of the Study:
- To investigate the ototoxic potential of air-gun noise on fish auditory systems.
- To determine if exposure to air-gun sound causes physical damage to fish ears.
Main Methods:
- Exposure of fish to an operating air-gun.
- Microscopic examination of fish ear structures (sensory epithelia).
- Assessment of hair cell integrity and signs of repair post-exposure.
Main Results:
- Extensive damage to sensory epithelia in the ears of exposed fish.
- Significant ablation of sensory hair cells was observed.
- No evidence of hair cell repair or replacement up to 58 days after exposure.
Conclusions:
- Air-gun noise from marine petroleum exploration causes severe, lasting ear damage in fish.
- The sensory epithelia of fish ears are particularly vulnerable to air-gun acoustic trauma.
- Lack of repair suggests long-term implications for fish populations exposed to seismic surveys.