"Fast-Growing Kelp Invades San Francisco Bay"

"SAN FRANCISCO -- A fast-growing kelp from the Far East has spread along the California coast from Los Angeles to San Francisco Bay, worrying marine scientists and outpacing eradication efforts.

In May, scientists for the first time found the invasive seaweed called Undaria pinnatifida clinging to docks at a yacht harbor in San Francisco Bay, fouling boat hulls and pier pilings."

Jason Dearen reports for the Associated Press July 11, 2009.