If you find a suspected European green crab or its shell in Washington, report it using the form below as soon as possible. At this time, we are not asking the public to kill suspected green crabs. This may sound counterintuitive but is intended to protect native crabs from cases of mistaken identity. As a Prohibited species, it is illegal to possess a live European green crab in Washington.
Report your sighting
Please enter European green crab for Species in the form below. Download Washington Sea Grant's Crab Identification Guide and take several pictures from different angles to confirm identification. It’s also helpful to include a coin or other object to help show its size. It’s also helpful to include a coin or other object to help show the crab's size.
Other ways to report European green crabs
You can also report European green crab sightings through the Washington Invasive Species Council app.
Or call WDFW Aquatic Invasive Species staff at 1-888-WDFW-AIS (1-888-933-9247).
This webpage includes information for the public on European green crab identification, reporting, and management. For more detailed resources for practitioners and partners as well as regular updates, please visit the European green crab species page.
A destructive invader
European green crabs are a globally damaging invasive species that pose a threat to Washington's economic, environmental, and cultural resources. Potential impacts include destruction of eelgrass beds and estuarine marsh habitats, threats to the harvest of wild shellfish and the shellfish aquaculture industry, the Dungeness crab fishery, salmon recovery, and a complex array of ecological impacts to food webs.
In areas where green crab have been able to establish reproducing populations, they have had dramatic impacts on other species, particularly smaller shore crab, clams, and small oysters. While green crab cannot crack the shell of a mature oyster, they can prey upon young oysters, and will dig down six inches to find clams to eat. One green crab can consume 40 half-inch clams a day, as well as other crabs its own size.
For the latest updates see our June 2022 news release: Emergency measures deployed to control invasive European green crabs in Washington waters
How to identify the European green crab
In the Pacific Northwest, there are many small, green native crabs that are easily confused with European green crabs unless you have a trained eye. In addition, green crabs can actually turn quite red as they age. In Washington state, the European green crab is most often confused with native helmet crab or hairy shore crab.
Download a crab identification guide from Washington Sea Grant or learn more about green crab ecology in this handout.
Or download this WDFW flier with European green crab reporting information and photos of native crab species.
The most distinctive feature of the European green crab is not its color – which can vary from reddish to a dark mottled green – but the five spines or teeth on each side of the shell. This number of spines is different from any other crab you are likely to see on the beach.
At its largest, the back shell (carapace) measures up to 4 inches across, but it is more common to find smaller, younger crabs. Males are generally larger than females of the same age.
Although known by the common name of green crab, color is not its distinguishing feature. Juvenile crabs can change their shell color to match their surroundings each time they molt. Adults are usually dark greenish with yellow markings, and often have some orange at the joints. The underside of the crab is off-white, but can sometimes be bright yellow or even red.
The back shell (carapace) is wider at the front than the back. The best way to distinguish the green crab from other species is by the number of spines next to the eye (marginal teeth). The green crab is entirely distinct from other native crabs with its five marginal teeth.
Legs and claws
The green crab has relatively long legs compared to the main body, and narrow claws. The last pair of legs is slightly flattened.
At this time, we are not asking the public to kill suspected green crabs. This may sound counterintuitive but is intended to protect native crabs from cases of mistaken identity. European green crab are classified as a Prohibited Level 1 Invasive Species in Washington, meaning they may not be possessed, introduced on or into a water body or property, or trafficked (transported, bought or sold), without department authorization, a permit, or as otherwise provided by rule. These regulations may change in the future, but for now they are the law.
It might be hard to let a crab go when you are concerned it could be invasive, but keep in mind that WDFW will respond to any confirmed sightings quickly, and the best thing you can do is to get the information to us as soon as possible. Permits and management support may be available for shellfish growers or private tideland owners encountering European green crabs.
Are European green crabs edible?
Though considered edible and fished commercially in parts of their native range, European green crabs aren’t any bigger than your fist and don't make the most appealing meal. Where eaten, they are used primarily for crab stock and soup.
At this time, we are not asking the public to kill suspected green crabs. This may sound counterintuitive, but is intended to protect native crabs from cases of mistaken identity. To protect native crab species and prevent the spread of invasive species, it is currently illegal to possess or transport live European green crabs in Washington.
Join the Washington Sea Grant Crab Team
WDFW has teamed up with the Washington Sea Grant Crab Team who is leading a volunteer-based early detection and monitoring program for European green crab. The Crab Team is also working to improve the understanding of native salt marsh and pocket estuary organisms and how they could be affected by green crabs.
To learn more about early detection, monitoring, and volunteer opportunities, please visit the Sea Grant’s Crab Team website.
Limiting the invasion
European green crab were discovered on the Washington coast in 1998 in Willapa Bay and Grays Harbor, and later in Makah Bay. European green crabs were first documented in the Salish Sea at Sooke Basin, British Columbia in 2012, and in the San Juan Islands in 2016.
Since 2016, European green crabs have been detected in Padilla Bay, Drayton Harbor, Lummi Bay, Sequim Bay, and Dungeness National Wildlife Refuge, among other areas. The most southernly location within the Salish Sea where green crabs have been documented is on the west side of Whidbey Island. As of early 2022, European green crabs have not been detected within Puget Sound south of Admiralty Inlet.
The European green crab first became established the United States in the mid 1800s, arriving by ship to the Cape Cod region. In the early 1900s they spread northwards, where they are believed to have contributed to the dramatic declines in the soft shell clam fishery as far north as Nova Scotia. In 1989, green crabs were first discovered on the West Coast in San Francisco Bay, California and made it into Oregon, Washington, and British Columbia coastal estuaries in the late 1990s helped by strong El Nino currents.
Learn more about potential impacts from European green crab on Washington's shellfish growers and aquaculture in this March 2022 blog post from the U.S. Fish and Wildlife Service.
Emergency measures request for invasive green crab response 2021-22
In 2021, WDFW, tribal co-managers, and partners identified an exponential increase of invasive European green crabs (EGC) within the Lummi Nation’s Sea Pond and outer coast areas, including Makah Bay, Grays Harbor, and Willapa Bay. This poses an imminent threat to Washington’s economic, environmental, and cultural resources. The $2.3 million appropriated by the State Legislature for EGC management in the 2021-23 biennium is not sufficient to control these exploding populations.
On Dec. 14, 2021, Director Susewind submitted an emergency measures request for invasive green crab response to Governor Jay Inslee. While emergency funding was not immediately available, on Jan. 19, 2022, Gov. Inslee issued an emergency order to address the exponential increase in the European green crab population within the Lummi Nation’s Sea Pond and outer coast areas. The proclamation directs WDFW to begin implementation of emergency measures and urges the Legislature to provide additional emergency funding as requested by the WDFW as soon as possible.
Working with the Governor’s office, the Office of Financial Management, tribal co-managers including the Lummi Nation, Makah Tribe, and others, and Washington Sea Grant, WDFW requested $8,568,00 million from the State Legislature during the 2022 supplemental session to control increasing European green crab populations. The Legislature fully-funded this request in the 2022 Supplemental Budget, which was signed by Governor Inslee on March 31, 2022.