Invasive Species Threaten Salmon In Pacific Northwest

[Achilles Tang]

Researchers assembled a database of invasive animals and plants in Washington, Oregon, and Idaho. The large numbers present included many nonindigenous fishes. The effect of the invasive species on salmonids was assessed by extrapolation from previous studies. The results indicate that non-native fishes, in particular, pose a major threat to native salmonids comparable to hatcheries, harvest, habitat loss, and changes to the hydrosystem.

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