The return of alewives, native migratory fish, to Maine rivers and streams is an annual spring event and the focus of restoration efforts statewide. Lots of attention is paid to the migration route, as people clear obstructions and remove barriers and improve passage from streams into lakes, the alewife’s ultimate destination where they spawn and lay eggs. This article in Maine Boats, Homes & Harbors reviews the available research on what happens to alewives in lakes, and their role in lake ecosystems. Many Maine lakes have been without alewives for 50 or 100 years or more.
Alewives in lakes