We're all aware of whirling disease and its negative effects on trout. But, are you familiar with other aquatic invasive species affecting our rivers? One of these invasive species, New Zealand mudsnails (NZMS), has rapidly expanded its range across the United States, and scientists have long suspected that anglers play a key role in its growing prevalence. The embedded video (above) shows the geographic expansion of NZMS between 1987 and 2019. But are anglers actually to blame?