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.

"I was walking in San Francisco Marina, and that's when I saw the kelp attached to a boat," said Chela Zabin, a biologist at the Smithsonian Environmental Research Center in Tiburon, Calif.

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