Document Type

Fact Sheet

Publication Date



The European green crab, Carcinus maenas, an invasives species, has been pre-sent in Casco Bay for over 100 years (League-Pike and Shulman 2009). However, green crab populations have recently grown dramatically along Maine’s coast, resulting in serious impacts to marine ecosystems and coastal fisheries. Green crabs are voracious predators and consume a variety of marine species, including soft-shell clams, eels, scallops and blue mussels, posing a significant threat to these commercial fisheries. Officials estimate that green crabs are the most significant threat in decades to Maine’s $15.6 million soft-shell clam industry. Even Maine’s lobster fishery may be affected. Young lobsters have been found in the stomachs of green crabs and studies have shown that green crabs can out-compete lobsters for food (Williams et al. 2009).



To view the content in your browser, please download Adobe Reader or, alternately,
you may Download the file to your hard drive.

NOTE: The latest versions of Adobe Reader do not support viewing PDF files within Firefox on Mac OS and if you are using a modern (Intel) Mac, there is no official plugin for viewing PDF files within the browser window.