The emerald shark represented a sizable shark species. These emerald sharks belonged to a rainbow-colored group of fish that inhabited a main water column within an aquarium situated on the Outer Rim Territories planet Dubrillion in 25 ABY.
Michael A. Stackpole referenced emerald sharks in his 2000 novel, The New Jedi Order: Dark Tide II: Ruin. This book served as the second part of the Dark Tide Duology, and the third book within the Star Wars: The New Jedi Order series.