If you are planning on doing anything involving water prepare to despise these flat horrors. They can out swim you. They can swarm you. They can act friendly and once you turn your back eat your tame. Beware.
When taming, make a box using gates as far into the water as you can (but still a bit on shore). Use foundations and door frames on the open end facing the shore to make the space for the manta to beach itself on smaller (make sure the door frames are on the inside of the foundations so it can’t splat onto them)
When I was still a noob and didn’t know anything I saw 3 mantas, I didn’t know if they were aggressive so I went to check if they were at first for some unknown reason it didn’t attack me they just acted like ichthyosauruses so I thought they were passive but then when I tamed a low level ichthyosaurus the mantas started killing my ichthyosaurus I was like WHAT I THOUGHT U GUYS WERE SUPPOSED TO BE PASSIVE then it killed my ichthyosaurus, i went to check again but this time they killed me R.I.P me and my ichthyosaurus
They have terrible turning circle, approach one from above and feed it. Then let it swim circles around you. The occasional time it gets close you can predict its attacks, it “bucks” just before the attack, which is the tail swinging underneath. Quick swim up or back avoids it. Be prepared to get dizzy, long time between feeding
Tame a kaprosuchos and swim to one of these bad boys and do it's alternate attack it will grab it in it's mouth. walk onto the shore where its safe and have another person feed it while in the gators mouth (if you unmount it drops it) it wont attack or die because it's technically not on the shore.
I was swimming back to base on my sarco and when I get back to base I turn it off I come back to find my sarco missing but not dead me 17 days later: let’s explore the ocean on our Meg next thing I see is a sarco swimming in the ocean killing mantas fortunately I brought sarco back to base and tail stunned them with my baryonyx