Chris Bartlett et al
Downeast Fisheries Trail website
Maine Sea Grant College Program
Alewives (Alosa pseudoharengus) and blueback herring (Alosa aestivalis), collectively referred to as river herring, are anadromous fish, which means they spend most of their adult lives at sea but spawn in freshwater. The two species look very similar. Fishermen usually harvest both species together and generally do not distinguish between the two. In Downeast Maine, alewives are more common than bluebacks and locals often use the terms “alewives” to refer to both species.
Beaty, Julia, "Fisheries Now: Alewives and Blueback Herring" (2014). Maine Sea Grant Publications. 72.
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