Best to tame during events, on x3 50 black pearls good for any tuso up to 140. Save your turtles)
Tusoteuthis
The Tusoteuthis is a massive, aggressive squid found in the depths of the oceans. In battle, the Tusoteuthis can grab its prey and knock it unconcious, siphoning its blood to gain health. Once tamed, the ink from a Tusoteuthis can be used as a constant Oil source. Some survivors choose to hunt the Tusoteuthis for its Oil.

How ARK players tame and knock out the Tusoteuthis: what to feed it, what to knock it out with, and how to keep it safe.