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Publisher's PDFThe sea scallop (Placopectenmagellanicus) fishery in theAtlantic is assessed during annualsurveys by using both dredgingand surface-deployed imaging techniques.In this pilot study in theMid-Atlantic Bight, we used an autonomousunderwater vehicle (AUV)to photograph the seafloor and toevaluate its use for determiningscallop density and size. During 22surveys in 2011, 257 km of seafloorwere photographed, resulting in over203,000 color images. Using trainedannotators and photogrammetricsoftware, we determined scallopdensity and shell heights for 15,252scallops. The inshore scallop groundsnear Long Island (at depths <40 m)had a density of 0.077 scallops perm2, whereas the inshore groundsof the New York Bight had a densityof 0.012 scallops per m2. Shellheights derived from images werefound to agree well with measurementsfrom scallops collected witha commercial dredge. We show thatimages obtained with an AUV can beused to reliably estimate both densityand shell height consistent withdirect sampling from the same area.Moreover, side-scan sonar imagesobtained with an AUV can be usedto detect dredge scars and, therefore,can provide a simultaneous,relative estimate of fishing effort inthat area. AUVs provide a highly accuratesuite of data for each surveysite and therefore allow the designof experimental studies of fishingpractices.University of Delaware. Department of Geological Sciences.University of Delaware. School of Marine Science and Policy

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Assessing the use of a camera system within an autonomous underwater vehicle for monitoring the distribution and density of sea scallops (Placopecten magellanicus) in the Mid-Atlantic Bight