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Stock assessment models help managers make decisions by characterizing the population dynamics of a marine species using biological and fishery information.Most models, however, lack an explicit description of the spatial distribution of fishing activity; harvester effort is assumed to be homogeneous across the fish stock.In most cases this assumption is violated because marine species tend to congregate in favorable habitats, where they are followed by the harvesters.This research aims to describe the spatial distribution of fishing effort and identify the consequences of violating the homogeneous effort assumption.The US sea scallop fishery, the most valuable fishery in the United States in recent years, is used as a case study.