A few years ago, a biologist on the Skagit River in northern Washington told
me that some salmon which had been spawned and reared in that river weren't
returning to the river as they thought they should. He said that it turned
out that a chemical that had been used to treat dock pilings in the bay
outside of the river's mouth interfered with the homing of the fish before
they left for saltwater as young fish, because they encountered the chemical
in the water at the same time they were imprinting on the river's chemistry.
-- Jay DeLong Olympia, WA
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