The results of the stage-based model, showing the status of the entire North West Atlantic Spiny Dogfish stock, forms the basis of the current stock assessment, which is tabled here. [...] The Canadian zone is defined as the eastern waters of the Gulf of Maine, the Bay of Fundy and the Scotian Shelf (Northwest Atlantic Fisheries Organization (NAFO) Divisions 4VWX5YZ), comprising the largest proportion of dogfish in Canadian waters (Campana et al. [...] The premise is that the accuracy of the catch at length will be directly proportional to the quality of the length frequency sampling. [...] MODEL RUNS The length-based TRAC model (Figure 10) could not resolve the rate and magnitude of the increase in the population, evidenced by the surveys for all population components in the mid- 1980s to mid-1990s. [...] The magnitude of the Canadian population estimated by the surplus production model is very similar to that of the stage-based model estimate with migration.