Salmon was a type of fish found on Earth, sometimes consumed as food.
In 2267, Spock referred to salmon and the eel-bird's need to spawn at a specific location while attempting to explain the intricacies of Vulcans' pon farr mating rituals. (TOS: "Amok Time")
In 2344, William T. Riker hooked a salmon while fishing in Alaska with his father, Kyle. Kyle proceeded to reel it in out of fear that his son might lose the fish. (TNG: "The Icarus Factor")
A common meal on First Contact Day, Commander Jack Ransom once noted, during a battle where the USS Cerritos' hull was being phasered into pieces, that they were being "carved up like a First Contact Day salmon." (LD: "No Small Parts")