Very easy to tame if you know what your doing. First tame an Ichthyosaur. Then grab a crossbow and some tranq arrows and find one and knock it out. It is not be able to attack if you are on the Ichthy. As you are taming it, be sure to remain on the Ichthy unless feeding narcs, so other creature don’t hurt you. Vote up if this helped
He will flee as soon as any torpor is dealt, which means you can trap him against a underwater cliff to tame him. He takes superior or snake kibble on mobile, and can break stone and gets tons of oil when tamed.