Clearwater Marine Aquarium will present its second in a series of “Echoes of the Ocean: A Marine Life Speaker Series, with its second presentation, “Superheroes of Manatee Conservation” on June 6 from 5 – 8 p.m. at CMA. The second in a series will reflect a 50-year span of research, rescue and release of manatees and CMA’s both a local and global reach.