Montana Study Reveals How Invasive Species Over Time Disrupt Native Species’ Food Webs; Lake Trout Vs. Bull Trout

November 11th, 2021

Invasive species cause biodiversity loss and about $120 billion in annual damages in the U.S. alone. Despite plentiful evidence that invasive species can change food webs, how invaders disrupt food webs and native species over time has remained unclear.

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Study Analyzes Non-Native Warmwater Fish Consumption Of Juvenile Salmon In Reservoirs; Walleye Predation Much Higher Than Native Pikeminnow

September 23rd, 2021

When warmwater fish species like bass, walleye and crappie that are not native to the Pacific Northwest, but prized by some anglers, overlap with baby spring chinook salmon in reservoirs in Oregon’s Willamette River they consume more baby salmon than native predatory fish per individual, new research found.

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Sea Lion Removal Over Until Fall Chinook Return; Under New Rules Biologists Removed 33 Pinnipeds At Bonneville Dam, 9 At Willamette Falls

June 3rd, 2021

At the end of the first spring in which biologists have been allowed by federal permit to lethally remove both California and Steller sea lions in the Columbia and lower Willamette rivers, fisheries biologists have stopped the removal activity as sea lions have left Bonneville Dam and both rivers for coastal rockeries.

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Evaluating Avian Predation Research: Science Panel Seeks Further Analysis On Effectiveness Of Bird Control Measures Aimed At Boosting Steelhead Survival

April 30th, 2021

The Independent Scientific Advisory Board has released an analysis of two studies offering differing views on the effectiveness of avian predation control measures in the Columbia River basin. The scientists say further comparative research is needed to determine if hazing and killing terns and cormorants are boosting steelhead smolt-to-adult returns.

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Managing Lake Pend Oreille Fisheries: 240,000 Non-Native Lake Trout Removed Since 2006, Walleye Now Targeted

April 9th, 2021

On the heels of a successful and significant reduction of lake trout in Lake Pend Oreille, Idaho is now using some of the same methods – gillnetting and an angler rewards program – it used to fight lake trout in a new effort to reduce the population of invasive walleye in the lake.

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2020 Draft Pinniped Predation Report: Steller Sea Lions At Bonneville Dam Taking Big Whack Out Of Steelhead, Sturgeon

April 2nd, 2021

During the fall 2019 and spring 2020 monitoring seasons at Bonneville Dam, sea lions continued to prey on salmon, steelhead and sturgeon, but the proportion of California sea lions is continuing to drop while that of steller sea lions continues to rise, according to a draft annual pinniped report by the U.S. Army Corps of Engineers.

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