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Development of New Methods for Quantifying Fish Density Using Underwater Stereo-video Tools
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Bait effects in sampling coral reef fish assemblages with stereo-BRUVs.

Stacey R Dorman1, Euan S Harvey, Stephen J Newman

  • 1School of Plant Biology and the UWA Oceans Institute (M470), University of Western Australia, Perth, Western Australia, Australia.

Plos One
|August 1, 2012
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Summary

Baited remote underwater stereo-video systems (stereo-BRUVs) effectively monitor demersal fish. Pilchards are recommended as a standardized bait for stereo-BRUVs in Western Australia due to consistent fish assemblage recording.

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Area of Science:

  • Marine ecology
  • Fisheries science
  • Ichthyology

Background:

  • Baited underwater video techniques are increasingly used for fish assessment due to being non-extractive, cost-effective, and statistically powerful.
  • Variability in sampling programs can arise from the diverse bait types currently employed in these methods.
  • Standardizing bait is crucial for improving the reliability and comparability of baited remote underwater stereo-video systems (stereo-BRUVs) data.

Purpose of the Study:

  • To investigate the influence of different bait types on fish assemblage structure and composition using stereo-BRUVs.
  • To compare fish assemblages recorded with various baits (pilchards, cat food, falafel mix, no bait) at the Houtman Abrolhos Islands.
  • To determine if bait type affects species richness and the abundance of targeted species in fished and unfished areas.

Main Methods:

  • Stereo-BRUVs were deployed for one-hour recordings at sites inside and outside a targeted fishery closure (TFC).
  • Four bait treatments were tested: pilchards, cat food, falafel mix, and a control (no bait).
  • Fish assemblage structure, composition, and species richness were analyzed across treatments and locations.

Main Results:

  • Significant differences in fish assemblage structure and composition were found between baited and non-baited treatments (P<0.001), but not in species richness.
  • Pilchard and cat food baits recorded similar fish assemblage components.
  • No significant differences in fish assemblages were observed between areas open or closed to fishing, irrespective of bait type.

Conclusions:

  • The use of bait significantly enhances stereo-BRUVs surveys for demersal fish assessment.
  • Pilchards are recommended as a standardized bait for stereo-BRUVs deployments along the mid-west coast of Western Australia.
  • While bait type influences species-specific responses, pilchards offer a reliable option for consistent monitoring.