The Rideau River supports an active muskellunge (Esox masquinongy) sport fishery. However, it also faces heavy recreational use and increasing development pressures. Little is known about the specific spawning habitats utilized by this population of muskellunge. This study was conducted by a group of concerned anglers from Muskies Canada Inc. (MCI) to provide an insight into critical spawning habitats used by these fish. External radio tags were attached to ten fish. Immediate catch-and-release survival for the study fish was high. Preliminary results suggests that spawning sites include bays, creeks and river bend areas.