Throughout August, The Texas Tribune will feature 31 ways Texans' lives will change because of new laws that take effect Sept. 1. Check out our story calendar for more.
DENTON — Every two months, Christopher Churchill, a U.S. Geological Survey biologist, scuba dives in Ray Roberts Lake, northwest of Dallas, to monitor the growth rates of zebra mussels, which have wreaked havoc on several Texas lakes and rivers.
“A year ago, it was hard to find just one zebra mussel,” Churchill said. “They’re everywhere now.”
Churchill’s assignment follows the 2009 discovery of the non-native zebra mussels in ...