Christopher J. Churchill, a biologist for the U.S. Department of the Interior and U.S. Geological Survey, displays several zebra mussels found along the shoreline of Lake Ray Roberts, near Sanger, Texas, Jul. 18, 2013.
Christopher J. Churchill, a biologist for the U.S. Department of the Interior and U.S. Geological Survey, displays several zebra mussels found along the shoreline of Lake Ray Roberts, near Sanger, Texas, Jul. 18, 2013. Brandon Thibodeaux

The discovery, confirmed last week by the Texas Parks and Wildlife Department, marks Canyon Lake as the southernmost affected lake in the state. Found first in 2009 in Lake Texoma, the invasive species has now infested 10 lakes in four river basins. (KXAN-TV)

John Reynolds was the newsletters editor for the Tribune from 2013 to 2017. Prior to that, he was a reporter for Quorum Report, a non-partisan online political newsletter focusing on the ins and outs under...