Invasive species are greatest threat to Northwest salmon, report says 
By Matthew Preusch US Source: The Oregonian 3/5/2009

Most discussions about the causes of declining salmon runs focus on the four H's: habitat, hatcheries, harvest and hydropower. But the most important factor may be an I, as in invasive species.

That's the conclusion of a new report from the National Oceanic and Atmospheric Administration's Northwest Fisheries Science Center in Seattle.
 

The study, which was published in the journal Bioscience, is sure to be controversial because much of the Northwest's multi-billion dollar salmon recovery work is centered on improving habitat, mitigating the damage of power-producing dams and curtailing commercial or recreational fishing.
This report argues the greatest threat to fish are non-native species like crappie or bass that can eat up juvenile salmon as the make their way downstream from their birthplace to the ocean.

 
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