ScottBall_apple-snail-SARA_River-Draining-water-museum-reach-1-6-2019-3

An invasive nonnative apple snail is held by a San Antonio River Authority employee after it was extracted from the San Antonio River. Credit: Scott Ball / San Antonio Report

An invasive nonnative apple snail is held by a San Antonio River Authority employee after it was extracted from the San Antonio River.