UC Davis research engineer Bill Sluis paints a red X Tuesday on rubber mats that will be used to suffocate invasive Asian clams on the bottom of Lake Tahoe's Emerald Bay. The X will guide divers to where the flap can be found in the mat. Sue Cockrell/Enterprise photo
Geoffrey Schladow of the UC Davis Tahoe Environmental Research Center describes how the rubber mats are being readied for installation later this month on the bed of Emerald Bay. Sue Cockrell/Enterprise photo
Asian clams about the size of a thumbnail are displayed in a jar Tuesday morning at UC Davis. The invasive species has the potential to produce large algae blooms along the shore — clouds of green that not only can make Tahoe’s crystal waters less pleasing to the eye but in need of more filtering for drinking. Sue Cockrell/Enterprise photo

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