WSG News Blog

Evidence of Invasive European Green Crab Found at Two New Sites

July 9, 2018

Washington Sea Grant’s Crab Team and Washington State’s Department of Natural Resources report evidence of the invasive European green crab at two new sites in the Salish Sea: Fidalgo Bay and Dungeness Landing, near Dungeness Spit. A green crab shell was found at Fidalgo Bay, and a live green crab was captured at Dungeness Landing.

Molted carapace of green crab found in Fidalgo Bay, near Anacortes by Washington Department of Natural Resources Puget Sound Corps and Crab Team volunteers. Photo: Cassidy Johnson/DNR

The crabs also continue to occur in Westcott Bay — the first inland area where they were discovered, on north San Juan Island in August 2016 — as well as at Dungeness Spit, where they were discovered in large numbers last summer.

Interestingly, the crabs found at most monitoring sites are adult sized — at least 39 mm, with some up to 85 mm carapace width. This suggests that the green crabs have been around for at least two or three years, and the warmer water temperatures in 2015 and 2016 may have helped the crab larvae invade Salish Sea waters. What this means for their continued persistence remains to be seen, but it underscores the need for sustained efforts to monitor and detect green crabs at sites around the Salish Sea, which will help to guide management strategies.

For more information about the monitoring efforts, or to learn how to identify green crabs, visit

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