European Green Crab

Fascinating facts about the European Green Crab

• The European green crab was first recorded in San Francisco Bay in 1989 and began rapid northward expansion in 1993. It reached Oregon in 1997, Washington in 1998, and British Columbia in 1999, extending its range by about 750 km (470 mi) in ten years.
• A single female European green crab can produce more than 400 000 eggs, releasing a massive larval cloud that drifts offshore for several developmental stages. After metamorphosing to the megalopa stage, the juveniles return to the intertidal zone where they settle among seaweeds and seagrasses such as Posidonia oceanica. This high reproductive output and offshore nursery habit supply a continual supply of new individuals that fuel the species' invasive success.
• Adult European green crabs are euryhaline, tolerating salinities from 4 to 52 ‰, and can survive temperatures ranging from 0 °C to 30 °C. This broad salinity tolerance lets them inhabit low-salinity estuaries, while the wide temperature range enables survival in icy winter waters beneath ice. Such physiological flexibility underpins their ability to colonise diverse coastal habitats worldwide.
• The European green crab can crush up to 40 ½ inch (13 mm) clams per day and also feeds heavily on oysters, mussels and other small crustaceans, with soft-shell clams being a preferred prey. It has been implicated in declines of soft-shell clam fisheries on the east coast of North America and in reductions of other commercially important bivalve populations.
• In 2025 scientists completed sequencing of the entire European green crab genome, creating a detailed genetic map that can be used to explore the traits behind its worldwide invasion success. This resource builds on earlier findings of marked genetic differentiation among regional populations, such as the distinct lineages between the North Sea, the Bay of Biscay and the Iceland-Faroe Islands group.

Sources

Every fact above was checked against these pages, and kept only where one of them states it.

• Wikipedia

At a glance

About the European Green Crab

In the turbulent tidal zones of the European coastline, the European Green Crab navigates its domain with calculated precision, its vibrant carapace a masterful blend of camouflage and warning signal. As it scuttles sideways across the rocky shoreline, its eyes twitching with alertness, this diminutive but formidable crustacean embodies the very essence of adaptability, its ability to thrive in a wide range of habitats a testament to its remarkable resilience. With each deliberate step, the European Green Crab weaves a subtle yet vital thread into the intricate tapestry of the marine ecosystem, its presence a reminder of the beauty and complexity that lies just beneath the surface.

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