Chinese Mitten Crab

The Chinese mitten crab was first identified in the south San Francisco Bay in 1992 by commercial shrimp trawlers, and quickly spread to the Sacramento and San Joaquin Rivers. The Chinese mitten crab threatens ecosystems, earthen structures, and fisheries by preying on and competing with many species, including fish eggs, clams, and mussels; and by eroding riverbanks, wetland edges, and levees.


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