Winter flounderPleuronectes americanuscollected in the inner New York Bight were tagged and released to determine generalized movement patterns. Between July 1986 and August 1989, there were 7,346 winter flounder (≥18 cm) tagged at 14 inshore stations in Sandy Hook, Raritan, and Lower bays and the Shrewsbury River and at 22 offshore stations associated with a sewage sludge dumpsite 22 km off the New Jersey coast. Results from 206 tag returns indicated that the Navesink–Shrewsbury river system, part of the Sandy Hook–Raritan estuary, supports a population of winter flounder that returns yearly during the spawning season. Winter flounder exhibited limited seasonal migration and intermixed with other winter flounder from the inner New York Bight, indicating the existence of a dynamic assemblage.