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Data on coral reef fish communities collected by diver-based surveys are subject to inherent biases which have the potential to limit holistic, spatially expansive investigations of reef communities. Though studies show worldwide declines in coral health and density, it is possible that evidence of decline on limited spatial scales may be masking reef-wide patterns. It is clear that new methods are necessary to investigate reef communities on wider spatial scales than in some studies previously reporting habitat declines. In this paper we compare and contrast fish density estimates as derived by traditional diver surveys and concurrent acoustic surveys. Fish densities derived from both diver and acoustic surveys display congruent patterns across independent parallel reef tracts. In further agreement, estimates of fish lengths directly observed by divers and estimated acoustically suggest that a seasonal increase in size exists across the surveyed reefs. The efficacy of diver-based surveys was shown to decline with increasing visibility, while acoustic survey results remained insensitive to changes in visibility. Consistent results between survey methods suggest that studies may utilize combined methods to investigate fish density distributions on large spatial scales not typically examined. 2.

A Comparative Study of Concurrent Acoustic and Diver Survey Data, and Fish Community Descriptions of a High Latitude Coral Reef, Florida, USA