Last October, an invasive species never before seen in North America was discovered in the deep waters of the Port of Stockton, about 92 miles east of San Francisco. No larger than the size of a paperclip, the seemingly innocuous, caramel-colored shells of golden mussels clinging to buoys and monitoring equipment in the Sacramento-San Joaquin Delta — and subsequently found at O’Neill Forebay in the San Luis Reservoir near Los Banos — have left California officials scrambling to stop the spread. On Wednesday, the California Department of Fish and Wildlife released its plan to address what it’s calling an “urgent invasive species threat,” with strategies to prevent further distribution of golden mussels and to minimize their impact on the environment, recreation, agriculture and, notably, drinking water infrastructure.

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• Western Water Rewind: Golden mussel, California’s newest Delta invader, is likely here to stay – and spread