If you find a suspected European green crab or its shell in Washington, report it as soon as possible using the form on the European green crab identification and information page. Download an identification guide and take pictures to confirm identification. 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.
This webpage includes detailed updates and resources. For information for the public on identifying and reporting European green crabs, please visit the European green crab identification and information page.
Sign up for our European Green Crab Management Updates email list.
For previous updates, please click the Conservation tab below. You can also find more information on our interactive European Green Crab Hub (wdfw.wa.gov/greencrabhub), which supports coordination of ongoing emergency measures, data collection, and science.
An increasing threat
The European green crab (Carcinus maenas) is a globally damaging invasive species that poses a threat to native shellfish, eelgrass, and estuary habitat critical for salmon and many other species.
Potential impacts include destruction of eelgrass beds and estuarine marsh habitats, threats to the harvest of wild shellfish and the shellfish aquaculture industry, salmon and forage fish recovery, and a complex array of ecological impacts to food webs. Research is ongoing regarding potential impacts on juvenile Dungeness crab and crab fisheries
In areas where European green crabs have been able to establish large populations for extended periods of time, they have had dramatic impacts on other species, particularly smaller shore crabs, clams, and small oysters. While green crabs 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. Their digging can have significant negative impacts on eelgrass, estuary and marsh habitats.
Learn more in this short video about European green crab impacts in New England on the Massachusetts coast. The below Northwest Now video segment from August 2022 covers European green crab concerns and management in Washington state.
Description and Range
European green crabs are shore crabs and are found in shallow areas—typically less than 25 feet of water—including estuaries, mudflats, intertidal zones, and beaches. They are not likely to be caught by recreational shrimpers or crabbers operating in deeper water, but may be encountered by beachgoers, waders, clam and oyster harvesters, or those crabbing off docks or piers in shallow areas.
The most distinctive feature 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. There are three rounded lobes between the eyes; and the last pair of legs are somewhat flattened. The carapace is broader than it is long and seldom exceeds 4 inches across.
In Washington state, the European green crab is most often confused with the native hairy shore crab or helmet crab.
Or download this WDFW flier with European green crab reporting information and photos of native crab species.
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 Niño currents. They were detected in southeast Alaska in 2022.
European green crabs 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.
Beginning around 2018, state and federal agencies, tribes, and partners began to detect significant increases in European green crabs—potentially linked to warmer water conditions, especially in 2021—in areas including Willapa Bay, Grays Harbor, Makah Bay, and Lummi Bay.
While infestations are present at locations along the Washington Coast as well as in Lummi Bay in Whatcom County and Sooke Basin on southern Vancouver Island in British Columbia, European green crab numbers remain low across other areas of the Strait of Juan de Fuca, San Juan Islands, and Bellingham and Padilla bays. They were first detected in Hood Canal in 2022.
European green crabs have not been confirmed in the Salish Sea south of northern Hood Canal and Marrowstone Island in Admiralty Inlet. Early-detection monitoring continues across central and south Puget Sound.
Rules and seasons
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.
The European green crab is 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.
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.
If you find a suspected European green crab or its shell in Washington, report it as soon as possible. You can also report sightings through the Washington Invasive Species Council app or Invasive Animal Reporting Form.
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.
Permits and management support may be available for shellfish growers or private tideland owners encountering European green crabs. Please contact firstname.lastname@example.org.
Beachgoers, anglers, recreational crabbers, and others are asked not to tamper with European green crab traps, which are often deployed in shallow areas exposed at low tide and are typically identified with a bright orange buoy and an official tag or permit.
For those who own or manage shellfish beds, beaches, or tidelands, support and permits for European green crab trapping may be available.
WDFW European green crab updates
- December 2023 - Quarterly Report (Q5) to State Legislature
- November 2023 - News release: Invasive European green crab report leads to rapid response at Salt Creek Recreation Area
- October 2023 - European Green Crab Public Update (Sept/Oct)
- September 2023 - European Green Crab Public Update (July/August)
- September 2023 - Quarterly Report (Q4) to State Legislature
- June 2023 - European Green Crab Public Update (May/June)
- June 2023 - News release: WDFW launches online hub for coordinated management of invasive European green crab
- June 2023 - Quarterly Report (Q3) to State Legislature
- May 2023 - European green crab federal funding requests (two-pager)
- April 2023 - European Green Crab Public Update (March/April)
- March 2023 - European Green Crab Letter to Congress
- March 2023 - European Green Crab Letter to NOAA
- March 2023 - Quarterly Report (Q2) to State Legislature
- February 2023 - Letter on EGC and Prohibited invasive species to shellfish shippers, dealers
- February 2023 - European Green Crab Public Update (January/February)
- January 2023 - European Green Crab FY23 Strategic Action Plan
- December 2022 - European Green Crab Public Update (November/December)
- December 29, 2022 - News release: Live European green crabs confiscated from seafood market; species remains prohibited in Washington
- December 13, 2022 - European Green Crab Management Update (one-pager)
- December 2022 - Quarterly Report (Q1) to State Legislature
- October 2022 - European Green Crab Public Update
- September 2022 - European Green Crab Public Update
- August 2022 - European Green Crab Public Update
- July 2022 - European Green Crab Public Update
- June 26, 2022 - News release: Emergency measures deployed to control invasive European green crabs in Washington waters
- May 19, 2022 - News release: Community science volunteers discover invasive European green crab in Hood Canal
- January 20, 2022 - Blog post: European green crab increase warrants emergency actions
Please contact email@example.com for earlier updates, or read on for additional information.
Emergency measures deployed to control invasive European green crabs
In 2021, WDFW, tribes, 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 was 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, tribes, 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; including emergency funding in the remainder of Fiscal Year 2022 and funding through Fiscal Year 2023. The Legislature fully-funded this request in the 2022 Supplemental Budget, which was signed by Gov. Inslee.
The Washington State Emergency Management Division assigned European green crab response as a formal mission # 22-1085 on April 18, 2022. After meeting with other state and federal agencies, the Washington Department of Fish and Wildlife (WDFW) Director Kelly Susewind formally implemented an Incident Command System (ICS) on May 5 in delegating authority to Allen Pleus, WDFW’s Aquatic Invasive Species Policy Coordinator, to serve as Incident Commander. The ICS also identifies Coastal and Salish Sea management branches.
With the emergency order and funding, WDFW has been working with tribes, other state and federal agencies, as well as shellfish growers and private tidelands owners to establish a coordinated response, hire and deploy personnel, and purchase and distribute equipment to areas with known green crab infestations. More than 285,000 of the invasive crabs were removed from Washington waters in 2022, most from Willapa Bay and the Lummi Nation’s Sea Pond.
WDFW’s Aquatic Invasive Species (AIS) unit anticipates deploying more than 25 staff and 1,000 traps during the 2023 field season, along with other equipment and resources.
In April 2023, the Washington State Legislature and governor continued the level of funding with $6,082,000 appropriated annually for green crab management in the 2023-25 Operating Budget.
For 2023-2025, WDFW is funding co-managers, tribes, and partners for continued statewide EGC management as part of the approximately $12 million dollars appropriated by the Washington State Legislature in this biennium. In total, nearly $9 million will be passed through including:
- $2 million for the Pacific and Grays Harbor Conservation Districts to support coastal work;
- $2.9 million to the Lummi Nation;
- $950,000 to the Makah Tribe;
- $1.34 million to Washington Sea Grant;
- $800,000 to the Washington Department of Natural Resources;
- $640,000 to the Washington Department of Ecology; and
- $200,000 to the Recreation and Conservation Office (RCO).
For more background information, see our June 2022 news release: Emergency measures deployed to control invasive European green crabs in Washington waters.
Limiting the invasion
The Washington Department of Fish and Wildlife (WDFW) has focused much of its efforts in the early detection of green crabs by monitoring locations that offer good habitat for the species. If the species is detected at a new location, WDFW conducts rapid response actions to reduce or eliminate those new populations, and to prevent the spread of European green crab from established locations.
See our 2023 Strategic Action Plan (SAP)
Or learn how a broad collaboration of volunteers, agencies, and tribes is working together to keep the crabs at bay in Washington state in this interactive story map.
Shellfish Transfer Permits
Washington State prohibits the release of non-native species into Washington’s waters and the intentional import of live green crabs. To reduce risk of unintentional introductions, WDFW restricts movement of shellfish from green crab areas and requires that anyone seeking to move live shellfish into or around state waters be approved for an import or transfer permit, which may include precautionary treatment measures to further reduce risk.
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 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.
Salish Sea Transboundary Action Plan
As the prevention of green crab infestations requires widespread help, WDFW worked with the Canadian Department of Fisheries and Oceans, the Puget Sound Partnership, and Washington Sea Grant to develop the Salish Sea Transboundary Action Plan.
For more information on European green crab management in British Columbia, see this webpage from the Invasive Species Council of B.C., or watch this new video from Coastal Restoration Society about green crabs on Vancouver Island.
You can also find more information on our interactive European Green Crab Hub (wdfw.wa.gov/greencrabhub), which supports coordination of ongoing emergency measures, data collection, and science.
A European Green Crab Management Updates email list is also available for sign up at wdfw.wa.gov/about/lists.
Outreach and identification materials
General information and educational materials:
- Invasive European green crabs in Washington interactive StoryMap (2023)
- European green crab in Washington Plain Language Talking Points (2023)
- Invasive European green crabs in Washington presentation (2023)
- Map of Washington European green crab detections in 2022
- Map of Washington European Green Crab ICS Branches and Management Areas (2023)
- Washington European green crab management definitions
Physical outreach materials:
- European green crab identification and reporting sign for beaches, marinas, boat ramps, water access areas, etc.
Español/Spanish: Señal de informe de cangrejos verdes europeos
- European green crab identification flier
- European green crab informational poster
- European green crab sticker
- European green crab wallet-sized ID card
Español/Spanish: Tarjeta de identificación de cartera de cangrejos verdes europeos
Tiếng Việt/Vietnamese: Thẻ căn cước ví cua xanh châu Âu
- Invasive European green crabs rack card/brochure
Español/Spanish: Folleto/tarjeta publicitaria de cangrejos verdes europeos invasivos
Tiếng Việt'Vietnamese: Thẻ/tờ rơi về loài cua xanh châu Âu xâm lấn
українська/Ukrainian: Інвазивні європейські зелені краби. Картка/брошура
Soomaali/Somali: Kaarka rack carsaanyada cagaaran ee Yurub ee duulaanka / buug-yaraha
- Crabs of Washington identification one-pager
If your organization is interested in acquiring printed copies of these materials, please contact outreach specialist firstname.lastname@example.org.
- European green crab identification graphic
- European green crab coloring sheet
- European green crab identification image with labels
- Washington Sea Grant European green crab identification guides
- Washington Sea Grant European green crab Informational Handout
- USGS Invasive European Green Crabs: A threat to Washington's shellfish industry infographic (2022)
Washington Sea Grant also has additional European green crab identification resources available on this webpage.
Presentations, videos and webinar recordings
View our European Green Crab playlist on YouTube for all recordings.
- European Green Crab Public Update Webinar (during Invasive Species Awareness Week hosted by Washington Invasive Species Council / RCO) - Feb. 21, 2023
- European Green Crab Stakeholder/Partner Meeting (Salish Sea), Feb. 15, 2022
- European Green Crab Stakeholder/Partner Meeting (Outer Coast), Feb. 17, 2022
Environmental Education resources and curriculum
- WDFW Aquatic Invasive Species lesson plan
- Wild Washington webinar: Getting Crabby: Exploring Careers Working with European Green Crabs (YouTube)
- Pacific Education Institute Invasive Species Workshops Inspire Teachers and Students to Take Action, 2023
Please see the Conservation section above or contact email@example.com for additional information.