To quote the super legit Wikipedia entry on the Sabertooth Salmon (Oncorhynchus rastrosus).. "the sabertooth salmon, is an extinct species of Salmon that lived along the Pacific coast of North_America, first appearing in the late Miocene, then dying out some time during the Pleistocene. Adults grew to be 2.7 m (9 ft) in length"
These things were 9ish feet .... If they were adding a 9-foot blood sucking salmon to mount/ride ... Now that's something I'd be interested in!!