1. Don't shoot their head, shoot their butt or body. (This is true, dont trust gamepedia)
2. It wont left deep sea, so u can easily stay out of deep sea border and KO them.
3. Make sure to kill everything else around it before start to K.O it.
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