Science: Old Grads' Return

In a bare concrete pool on the campus of the University of Washington, 15 silver salmon swam happily last week, their fancies turned to thoughts of mating and spawning. They were historic fish—the first salmon to return from the sea to an artificial pool.

The 15 were part of a batch of 26,000 fingerlings hatched at the University's Applied Fisheries Laboratory. The fingerlings were marked by having their fins clipped, and put in the concrete pool. After two weeks there, they were sluiced down a flume into Seattle's Lake Union, from where they found their way to the Pacific. Ever since, Dr....

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