Inva­sive species can wreak havoc on ecosys­tems, like the Atlantic Ocean off the South­eastern U.S. and the Caribbean. Researchers have strug­gled in recent years to combat the pres­ence of lion­fish — which are native to the Indo-​​Pacific waters. Annette Govin­darajan, an instructor in North­eastern University’s Depart­ment of Earth and Envi­ron­mental Sci­ences, explores the dan­gers that this fish and other inva­sive species present.