Fisheries science and management face common challenges in both freshwater and marine systems due to overfishing, habitat loss, and foodweb changes brought about by invasive species. Despite recent declines in fisheries resources, there have been management successes in both marine and freshwater fisheries. This symposium provides a forum for scientists to discuss and share research and management tools through case studies of how various fisheries concepts and paradigms were applied to achieve management goals. Examples of research topics that cross marine and freshwater systems include: estuarine studies, invasive species control, fish early life history paradigms such as match mismatch and critical stage hypothesis, stock assessment, harvest policies, and fisheries management governance structures.