Dododex
ARK: Survival Evolved & Ascended Companion
(mobile) Sarcos do not do well as a battle mount in deep waters. Not just…

(mobile) Sarcos do not do well as a battle mount in deep waters. Not just because of their narrow attack range, low dps and slow vertical swimming speed. They consume food like crazy. Ever saw tips telling you this creature or that uses extreme amounts of food? Like Giga or Daedon? Well, Sarco is one of them. Its food stat drains faster than it can automatically consume, which is fine if you're going for relatively short trips like pearl diving or angler hunting, but it is a problem if you're doing something time-consuming like leading a Leeds halfway around the map back to your base. Even on high levels (442 after tame for instance) your sarco will slowly starve even when there's still a stack of meat in its inventory. An Icthy works better as a travel mount while most other underwater creatures are better for combat. If you're looking for an underwater specialist, only choose the sarco if you don't have access to other creatures yet. (Or use a bary)
More Sarco Utility Tips
Once upon a time, my Sarco and I were hunting some Megalodons for fish meat, when a pack of Cnidaria stung the both of us, I tried to swim to the shore but it's too late. Mantas and Megs attacked me and my Sarco. My Sarco tried to fight back, biting his opponents. I swam back to the shore, and... My Sarco never came back. His dead corpse was a feast for Mantas and Megalodons. I hold my fists, my mind thirst for revenge. Rifle in hand, I swam back, shooting every Megalodon and Mantas I see. It was a bloodbath, bodies of Megalodon and Mantas floating in the ocean. I avenged his death… My Sarco…
Rain pours down to the land. He left his beloved wife and son.
One like = One Sarco lives.
TLC patch coming March 2018 adding "Deathroll" grab attack on small creatures and a grab attack (possibly thrash) on larger ones, gaining a 180 degree attack and a small lunge to its attack (maybe for deathroll purpose), will no longer aggo pirahnas and in the wild will sit with mouth gaped open awaiting prey.