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Lingcod (Ophiodon elongatus) populations along the West Coast of North America have recovered from overfishing, but the status of genetically distinct lingcod in Puget Sound, Washington is less clear. This project will use small-scale lingcod releases to learn about the benefits and risks of using stock enhancement as a tool to help rebuild marine fish populations. We have conducted experiments to improve rearing methods, improve release methods, and learn about lingcod life history, and are proceeding with a before-after-control-impact study that will quantify ecological impacts on wild fishes. WDFW collaborates on this project by conducting creel surveys. This project has been or is currently supported by the Science Consortium for Ocean Replenishment, the Puget Sound Recreational Fisheries Enhancement Fund, and NOAA Aquaculture. Previous or present partners include the Northwest Indian Fisheries Commission, the Nisqually Tribe, WDFW, and the Washington SCUBA Alliance. Lab and field data on effects of acoustic tags on hatchery lingcod behavior (feeding, movement).