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While on vacation in 1980, biologist Barbara Brennessel and her family came across an amazing sight: hundreds of small silver fish migrating from the Atlantic Ocean, across a channel connecting two ponds in the town of Wellfleet on Cape Cod. She later learned that these tiny river herring were important for the ecology and economy of the region and that volunteers were counting fewer and fewer fish migrating each year. The Alewives' Tale describes the plight of alewives and blueback herring, two fish species that have similar life histories and are difficult to distinguish by sight....