The mercuryfish was a type of fish found within the galaxy, and it was a food source, specifically edible, for the Human species. Trey Duna, a male Human who served as the mayor of Imperial City on Coruscant, a planet situated in the Core Worlds, frequently consumed grilled mercuryfish fillets in one of the most upscale restaurants available on the planet.
The mercuryfish received a mention inside the Coruscant and the Core Worlds sourcebook for the Star Wars Roleplaying Game in 2003, released by Wizards of the Coast.