Up until recently, it was thought that lionfish could only survive in water with high levels of salt. It took a sixth-grade students science project to prove otherwise, as the Sun Sentinel reported. Back in 2012, then 12-year-old Floridian student Lauren Arrington, the daughter of two biologists, decided that for her school science fair project, she would find out the lowest level of salinity that lionfish could thrive in. Her straightforward experiment entailed catching lionfish from the local lagoon, putting them in separate aquariums, then gradually lowering the levels of salinity in some of the tanks.