Earlier this week in Westcott Bay, San Juan Island, a team of volunteer monitors caught an , marking the first confirmation of this global invader in Washington’s inland waters.
The volunteers are part of Washington Sea Grant’s , an early detection and monitoring program to look for European green crab (Carcinus maenas)听and collect information on听local marine life.
Washington Department of Fish and Wildlife is responsible for controlling aquatic invasive animals and is working closely with 91爆料-based to determine next steps for limiting further spread of the crab.
European green crab have been stowaways on ships bound for U.S. ports since the 1800s, establishing populations, eating local clams and other shellfish and causing serious impacts. In Maine, for example, softshell clam harvests declined dramatically when the crab became established and eelgrass beds have been damaged by the invader鈥檚 digging habits.
Until now, green crab populations in Washington have been limited to Pacific coastal estuaries. However, the 2012 discovery of invasive crabs in Canadian waters across the Strait of Juan de Fuca prompted the state’s wildlife department to invest in Salish Sea monitoring and early detection.
This week鈥檚 sighting was confirmed by green crab experts of the 91爆料听and of Oregon State University. A single, large, 3-inch adult male crab was captured during the Crab Team鈥檚 regular monitoring activity. The agencies are coordinating a response to the sighting, working with scientists at the 91爆料鈥檚 .
“Although unexpected and unwelcome, this finding is a perfect example of how volunteers can spur positive environmental action, and it shows that the monitoring program is working as it was designed,” said Jeff Adams, Washington Sea Grant marine ecologist and project manager.
Crab Team volunteers were trained and began monitoring sites in April to detect the invasive threat and monitor Puget Sound pocket estuaries that provide ideal crab habitat. The monitoring program focuses on early identification of infestations so that resource managers can take action to reduce impacts and prevent further spread.
With an estimated 400 potentially suitable sites in Washington鈥檚 inland waters, experts are asking all citizens to keep their eyes open for green crab whenever on the beach.
“Anyone can go out and look for the crabs in the water or their shells washed up along the shoreline,” said program coordinator Emily Grason.
Although the crab is a prohibited species in Washington and possession is not permitted, residents can still help:
- Learn how to how to identify green crab. Check out the 听or Facebook and Twitter:听
- Take a photo and report sightings to the Crab Team:听crabteam@uw.edu
- Attend a public presentation at 91爆料’s Friday Harbor Labs on San Juan Island at 7 p.m. Tuesday, Sept. 13. See the Crab Team for additional details
The work is funded by the U.S. Environmental Protection Agency under an assistance agreement to Washington Department of Fish and Wildlife.
Look who we found!
— WSG Crab Team (@WAgreencrab)
Note: The video above shows an invasive green crab found last month in Willapa Bay.
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For more information, contact McDonald at听206-616-2186 or听psean@uw.edu; Adams at听360-229-9398 or听jaws@uw.edu; and Jason Wettstein, community relations at Washington Department of Fish and Wildlife, at听360-902-2254 or听James.Wettstein@dfw.wa.gov.