5. RESEARCH DOCUMENTS SEA LIONS’ IMPACT ON SALMON

Sightings of ocean-roving pinnipeds such as California sea lions have for decades been reported by fishers and others as far upstream as Bonneville Dam — more than 140 river miles from the Pacific Ocean.

But their presence seems more in evidence below the dam in recent years, intercepting adult salmon as they approach fish ladders that get them past that first hydrosystem hurdle on the Columbia River.

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