In Oregon, human-made barriers have turned centuries-old migratory routes into life-or-death struggles for fish.
migration barriers that block passage to spawning grounds, alteration of creek habitat, in-channel mining, temporary road-building through channels, water pumping, predation by and competition from ...
migration barriers that block passage to spawning grounds, alteration of creek habitat, in-channel mining, temporary road-building through channels, water pumping, predation by and competition from ...
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