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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Future Bright For American Shad, Most Abundant Anadromous Fish In Columbia River Basin; Risks To Native Salmonids Unknown

October 28th, 2021

American shad, a non-native fish species introduced to the Columbia River basin in the late 1800s, has replaced salmon and steelhead as the most abundant anadromous fish in the basin – by a long shot – and, although there are a number of uncertainties, their abundance could be impacting salmon and steelhead recovery in the Columbia and Snake rivers, a recent report says.

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Find Invasive Species In Early Stages: E-DNA Being Used To Successfully Detect Unknown Incursions

June 3rd, 2021

Biologists led by the University of Iowa discovered the presence of the invasive New Zealand mud snail by detecting their DNA in waters they were inhabiting incognito. The researchers employed a technique called environmental DNA to reveal the snails' existence, showing the method can be used to detect and control new, unknown incursions by the snail and other invasive species.

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Report Shows Northwest Watercraft Inspections In 2020 Intercepted 107 Mussel-Fouled Boats, Up From 2019

April 30th, 2021

A draft report by the Pacific States Marine Fisheries Commission shows that funding for watercraft inspection stations in the four Northwest states in 2020 remained nearly the same as levels spent in 2019. However, interceptions of small watercraft infested with zebra or quagga mussels at the states’ borders rose by 15 percent.

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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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