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Appendix B3: Comparison of scallop density estimates using the SMAST scallop video survey data with a reduced view field and reduced counts of individuals per image.

Introduction The University of Massachusetts Dartmouth School for Marine Science and Technology (SMAST) has conducted an annual continental shelf-wide video survey for scallops in the MidAtlantic and Georges Bank areas since 2003. The survey provides information about abundance, density, shell height distribution and spatial aggregation of scallops in the Mid Atlantic Bight (MAB) and Georges Bank (GBK) regions of the scallop resource. In this analysis, we examined alternative methods for calculating scallop density from SMAST survey images. To address potential bias in density calculations resulting from scallops on an edge of the visible image, we compared different methods of counting scallops and different methods for expanding the image view area. For this assessment, the Invertebrate Subcommittee decided to calculate density using all scallops visible in images (as before) and an assumed view field equal to the area calculated from the dimensions of the sample frame plus 1⁄2 of mean shell height in each area for each year. This increased density estimates by 1-3% in the MAB and GBK stock areas. In the future, densities will be calculated both by excluding scallops that lie on the top and right edges of the video images and using the area within the sampling frame and by including all visible scallops and adjusting the dimensions of the sample frame based on mean shell by area.