Sponsor: Great Lakes Fishery Commission Lampreys, one of the most primitive fishes, are of international conservation interest and are model organisms in biology and medicine. Additionally, controlling invasive Sea Lampreys is of great concern in the Laurentian Great Lakes. Hailing from Portland to Portugal, 37 speakers convened over three days to share information on these fascinating fishes. Insights were gained through comparisons across species and at different spatial scales. Investigating dam passage was a common thread. In Europe and the Pacific Northwest, scientists and managers are developing innovative ways to pass lampreys at barriers. In the Great Lakes, researchers are working to selectively block Sea Lampreys. Some technologies developed for control, including use of pheromones and alarm cues, have potentially promising applications in lamprey conservation. The symposium also highlighted knowledge gaps in lamprey biology. Little is known about the trophic phase of many lamprey species, particularly in the open ocean or Great Lakes. Larval lampreys have been discovered in lentic areas such as estuaries, both in fresh and salt water, but how these populations came to be is not well understood. The Great Lakes Fishery Commission was pleased to sponsor this symposium, helping to promote dialogue and foster collaboration among lamprey enthusiasts everywhere. — Julie Hinderer, Great Lakes Fishery Commission, [email protected] Read the symposium abstracts here.