Marissa McMahan collects juvenile lobsters

HARPSWELL, ME - AUGUST 31: Marissa McMahan holds a juvenile lobster in Lowell's Cove in Harpswell on Monday, August 31, 2015. While lobstering with father off Georgetown in 2012, McMahan discovered black sea bass in the lobster traps, a fish normally found in warmer mid-Atlantic waters. McMahan is now a doctoral student at Northeastern University doing her dissertation on how black sea bass are spreading and interacting with with lobster and other native species. (Photo by Gregory Rec/Portland Portland Press Herald via Getty Images)