Join educators, water quality experts and scientists to discover an important local ecological story that might surprise you. Each spring Alewife and blueback herring migrate up local rivers—including the Mystic—to spawn. River herring are vital organisms in our local ecosystem. Despite human created barriers and urban waterways, their numbers are on the rise. Find out about the connections between fish, birds, barriers and water quality. No pre-registration necessary, check in upon arrival. Rain or shine.