The threat of invasive mussels has led the Okanagan Basin Water Board (OBWB) to propose a potential temporary ban on all out-of-province boats entering B.C.'s waterways. James Littley, deputy administrator for the OBWB, said two species of freshwater mussels — zebra and quagga mussels — could be catastrophic to lake and river systems if stringent measures aren't put in place to keep them out of the province.