Alewife

Alewife (Alosa pseudoharengus), fish in the herring family. Alewives travel in large schools along the Atlantic coastline of the United States. They grow up to 15 in (38 cm) in saltwater and, in the freshwater of the Great Lakes, up to 6 in (15 cm). After maturity, saltwater alewives travel from the Atlantic to freshwater, where they lay their eggs.