The Idaho State Department of Agriculture confirmed this week the presence of quagga mussel larvae in the Snake River at Twin Falls. Multiple samples of quagga mussel at larval life stages have been found in the Centennial Waterfront Park area by ISDA’s early detection monitoring program.
Idaho Fish and Game has received more verified reports and pictures from people catching walleye in the Hells Canyon reach of the Snake River and Salmon River in 2023 than in all previous years.
The invasive Asian clam is more common in the lower Columbia River than its native habitat of southeast Asia, according to a study of the clam’s abundance in the river.
The Columbia River basin in 2023 is still the only major river basin in the U.S. free of quagga and zebra mussels, largely due to the Northwest’s four-state watercraft inspection efforts, according to a presentation this week at the Northwest Power and Conservation Council by Stephen Phillips, senior program manager at the Pacific States Marine Fisheries Commission.
A small invasive beetle that has decimated ash groves in the Midwest was found in Oregon earlier this summer, the first to be found on the West Coast. When – not if – it spreads in Oregon, it has the potential to destroy large swaths of ash trees in forests and along streams located on the west side of the Cascade Mountains. The loss of the trees could impact salmon and steelhead in the Willamette Valley.
Deployment of emergency measures to control invasive European green crabs on the Washington Coast and at sites within the Salish Sea is well underway, including the implementation of an Incident Command System to facilitate statewide coordination between various agencies, tribes, and partners.
In the battle to block destructive zebra and quagga mussels from infesting Pacific Northwest waters, the four states at watercraft inspection stations in 2021 intercepted 55 more fouled boats than last year even though the number of total inspections were substantially less than in 2020.
An effort by tribes, the state of Washington and federal agencies to suppress or eradicate invasive Northern Pike is bearing fruit in Lake Roosevelt, the reservoir behind Grand Coulee Dam, according to an update by biologists at this week’s meeting of the Northwest Power and Conservation Council’s Fish and Wildlife Committee.
European green crabs feast on shellfish, destroy marsh habitats by burrowing in the mud and obliterate valuable seagrass beds. The invasive species also reproduces quickly, making it a nightmare for wildlife managers seeking to control its spread in Washington’s marine waters.