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The invasive algae can overtake the environment and displace critical food sources for ocean animals on the Southern California coast. A team on Wednesday started removing the patch of fast-growing algae known as caulerpa prolifera from the harbor in Newport Beach, suctioning it through a tube and filtering the ocean water back out.

The process will take four or five days to complete and much longer until scientists can determine the algae is gone for good. So far, it’s been confined to a roughly 1,000-square-foot (90-square-meter) area not far from a small but popular beach. But tiny fibers can easily break off and take hold elsewhere

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