Assessing Baltic herring stocks with a model that incorporates migration

The model, which incorporates migration, produces higher spawning stock biomass estimates for the western stock and lower ones or the central stock, in comparison with the model that omits migration. The catch and biomass projections performed indicate that the migration effect on catch and biomass ranges from low (less than 5% change) to moderate (up to 20% change) in comparison with projections that omit migration.