Pennsylvania Fish & Boat Commission’s invasives chief eyeing many threats in state waters

Sean Hartzell spends his workday with the bad actors of the aquatic world. As the Pennsylvania Fish & Boat Commission’s invasive species coordinator, Hartzell monitors unwanted animals and plants that live in the state’s lakes, rivers, and streams, as well as those that are threatening to come here and take up residence. Among hundreds of non-native aquatic species, about 40 to 50 are particularly troubling, and a handful of those are the worst offenders, he said.