The ichyosaurus is really hard to tame what i do is find a hight level ichthyosaurus and kill all the dangrouse creatures around it and start taming it with dodo kibble and raw fish meat you probably need a raft to go in to the ocean to tame this ichthyosaurus.
If you wanna tame one of these beasts just go to Hervibore island and you’ll find so many of them following basilosaurs I tamed 2 and Breeded them I got baby ichthyasaur but got killed by lvl 1 Meg and I killed it and got teeth.Up if good
Best for killing scorpions on bottom of ocean floor since they don't take torpor. Scorpions down there will knock any other animals out. Once you kill it, hit it with a pickaxe to gather black pearls. Very useful for the next update with tek gear.