The California Department of Fish and Wildlife and partners have confirmed the presence of New Zealand mudsnails, or NZMS, at Warm Springs Fish Hatchery near Lake Sonoma. While NZMS have been detected in other portions of the watershed, this is the first confirmed detection at Warm Springs Hatchery. NZMS were detected in an intake pipeline and an aeration pond during a regularly scheduled quarterly hatchery survey this summer. Since the detection, scientists have conducted surveys in about 75% of Coho-bearing streams in the watershed and have not observed NZMS presence beyond previously known locations.

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