Oceanarium Rosario Islands

This guide to the Oceanarium on the Rosario Islands near Cartagena follows marine biologists chasing a single unpredictable night each August, when two of the Caribbean's most endangered corals, staghorn and elkhorn, spawn all at once. It traces years of waiting in the dark water off this island, watching for a burst that lasts only minutes before another twelve months pass. Look into the nursery pools around you, where fragments are grown on floating tables like a garden.