Saw fish closely resemble marlins, with their long protuberances (albeit with saw teeth along the edges), though conversely they have four webbed-feet and a tail. They are a light blue with very minimal armor, in contrast to most metal heads. It is semi-aquatic dwelling in the sewers and pipes.
The saw fish is a formidable enemy in the water, where it cannot be practically fought without relying on auto-targeting or large explosive weapons. Despite this however, it is only actually fought on land (even if it is in a body of water, it will climb on land to fight you). They do have an above average amount of health, but they are fairly clumsy and lack any ranged attacks.