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At 11:59 a.m. on Thursday, the anticipation was palpable on the banks of the Sandy River in Troutdale. Hundreds of people lined the river’s edge, dip nets at the ready, waiting for the first ...

Dr. Waldman is a professor of biology at Queens College and the author, most recently, of “Running Silver: Restoring Atlantic Rivers and Their Great Fish Migrations.” In his 1937 book, “Kennebec: ...