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Seismic acquisition causes substantial decrease in catch rates of commercially-important fish.

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Summary
This summary is machine-generated.

Marine seismic surveys significantly reduced commercial catch rates for whiting and flathead fish by up to 99% and 75% respectively. Impacts persisted for whiting for at least 10 months, indicating potential long-term effects on fisheries.

Keywords:
Catch ratesFishImpact assessmentSeismic noise

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Area of Science:

  • Marine Biology
  • Fisheries Science
  • Acoustic Ecology

Background:

  • Seismic surveys generate high-intensity noise, potentially harming marine life and altering behavior.
  • Commercial fishing grounds for eastern school whiting and tiger flathead overlapped with a marine seismic survey (MSS) area in southeastern Australia.

Purpose of the Study:

  • To assess the impact of marine seismic surveys on commercial catch rates of whiting and flathead.
  • To quantify the duration of these impacts on targeted fish species.

Main Methods:

  • Commercial Danish seine vessels conducted stratified random surveys in seismic acquisition and control areas (11,000 km²).
  • A Before-After-Control-Impact (M-BACI) analysis was performed on commercial logbook data.
  • Catch rates were compared between seismic and control areas, and analyzed over time.

Main Results:

  • Catch rates for whiting decreased by 99% and for flathead by 75% immediately after the MSS compared to control areas.
  • Negative impacts persisted for whiting for at least 10 months post-survey.
  • M-BACI analysis confirmed a significant reduction in whiting catch rates but not flathead, potentially due to fleet dynamics.

Conclusions:

  • Marine seismic surveys can substantially impact commercial fisheries, with effects varying by species and survey overlap.
  • Fish likely avoided the seismic acquisition area or were displaced, rather than experiencing direct mortality.
  • Further research is needed to understand species-specific responses and potential masking effects in fisheries data.