Golden mussel (Limnoperna fortunei), an invasive, non-native freshwater/brackish bivalve, was recently discovered in the Sacramento – San Joaquin Delta. This discovery is the first known occurrence of golden mussels in North America. The species poses a significant immediate threat to the natural ecosystems, water conveyance systems, infrastructure and water quality in California and across the U.S. Golden mussels are similar in appearance, biology, and impacts to quagga and zebra mussels, but can establish in waters with considerably lower calcium levels than required by quagga and zebra mussels.

If you observe this species take clear, close up photos, using some suitable object to show scale (size) and immediately report online