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Invasive Crab Alert: Second Mitten Crab Found in Oregon
10 Dec, 2025
Summary
- Second invasive Chinese mitten crab found in Oregon's Willamette River.
- Crab poses risks by damaging dikes, outcompeting native species.
- Washington officials urge public vigilance and reporting of sightings.
Washington residents are being urged to stay vigilant following the recent discovery of a second invasive Chinese mitten crab in Oregon's waterways. The Oregon Department of Fish and Wildlife confirmed the crab's presence in the Willamette River near Portland on November 18, marking the second detection this year within the Lower Columbia River watershed.
Chinese mitten crabs are a prohibited invasive species in Washington state. These creatures thrive in freshwater but reproduce in saltwater environments. Their burrowing behavior can lead to significant erosion, damaging dikes and stream banks, which can impact flood control and water supply systems. Additionally, they threaten native species through predation and competition, and can carry harmful pathogens.
The crab is identifiable by its approximate 3-inch width, hairy, mitten-like claws, and four spines situated on either side of its eyes. Washington officials are asking the public to report any suspected sightings to aid in containment efforts, providing several resources for reporting and identification.
