A two-year study was conducted, beginning in 2018, to understand the effect of density on the biological processes of the Atlantic sea scallop, Placopecten magellanicus . Quarterly sampling was conducted in two study areas of the resource, referred to as the Elephant Trunk Flex and Nantucket Lightship, where extreme recruitment events were observed in 2012 and 2013. Data collected included total scallop catch, as well as individual sea scallop length measurements, adductor muscle, gonad, and viscera weights, sex, reproductive stage, and shell samples for ageing. Data were analyzed to assess the impact of density on growth and yield using several methods. Generalized additive models were developed to model the relationship between catch-at-length and density (Figure 1) . Growth data collected from shell samples were analyzed with a von Bertalanffy growth model. Finally, shell height versus meat weight relationships were estimated that incorporated several variables including density, study area, and depth (Figure 2). All analyses indicated density in combination with settlement at depth in potentially marginal habitat contributed to reductions in growth and yield.