fish hatcheries
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Most people know the inspiring story of the salmon. Hatched in the gravel of a rushing mountain stream, the smolts are pulled by the waters downstream past logjams, lethal crevices in the rock, and sometimes into side pools from which there is no escape. Mile-after-mile, sometimes many hundreds of miles, the river grows but nowadays…
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It is an argument for removing dams as well. For many years biologists have known that hatchery fish effect the fitness of wild fish through competition and interbreeding. Hatchery fish don’t have the selective pressures that wild fish do so are less fit to survive in the wild. Because of this, when hatchery fish breed…
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“Steelhead turned out by hatcheries quickly evolve into a kind of swimming livestock with a poor chance of surviving in the wild and may carry their inferior traits into wild populations that biologists are trying to save, a new study of fish in Oregon’s Hood River has found.” Read the rest of the story: Hatchery…