A major threat to these fish populations is the same that many plant and animal species face: habitat destruction. In the case of salmon and steelhead, water impoundments, diversions, pollution, and disappearance of water channels have all severely impacted habitat needed by juveniles and smolts for survival. Increasing human populations with their requisite need for water have simply removed much of the fish’s natural habitat. Other factors are introduction of invasive species and overfishing.
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