Oregon Confirms Second Invasive Crab Sighting: Willamette River Alert

Oregon wildlife officials are increasingly concerned following the confirmed capture of an invasive Chinese mitten crab in the Willamette River. This discovery, approximately 150 miles from a previous sighting earlier this year, represents the second instance of this non-native species being found in Oregon waters. The crab, easily identified by its "mitten-like" hairy claws and brownish-orange to greenish-brown appearance, is capable of significant terrestrial movement, including climbing walls up to 13 feet high.

Unlike Oregon's native crab species that inhabit marine environments, Chinese mitten crabs thrive in freshwater and migrate to brackish water for breeding. Originally from East Asia, this species established itself in the San Francisco Bay area decades ago and has since spread along the U.S. East Coast. The Oregon Department of Fish and Wildlife, in collaboration with federal agencies and research institutions, is intensifying efforts to ascertain the extent of the infestation.

Possessing or selling these crabs is illegal in Oregon due to their invasive nature and potential ecological disruption. Officials suspect that illegal food imports could be a pathway for their introduction. To aid in detection, artificial habitats are being deployed, and water samples are being collected in affected river systems, including the Columbia and Willamette rivers, to identify any lingering populations of this concerning invasive species.