A saber-tooth salmon as depicted by Ray Troll
The Saber-toothed Salmon of the Miocene to Pliocene (13 to 4 million years ago) of the Pacific Northwest, known as Oncorhynchus (Smilodonichthys) rastrosus to paleontologists, was exceptionally large for a salmon, measuring over 2 meters (6.5 feet) long! It is named for the large canine-like teeth in its upper jaw, presumably used for competition among males during spawning season, much like the hook that forms on modern male spawning sockeye salmon.
LINK (via:University of Oregon Museum of Natural History)