Go to herbivore island (The island) at the right bottom. Go to map if unsure. Look around and you should find some itchyosaurus. But be careful, in the water they look like sharks, don’t mistaken them as sharks they have a pointed snout. Like if you found it helpful! :)
(Mobile) The friendliest creature in the ocean and possibly the entire island. It will never attack you, even if you hit it repeatedly and have ammonite rage status on you. It might not seem cute to you, but you're a true monster if you kill them on purpose.
So I had 2 icthys and it was amazing, they didn’t make anything aggro,but 2 Brontie fell in the water and killed them accidently. So I had to get a new one. It took ages but I eventually tamed one. But as soon as it was tamed 2 megs attacked it. It barely survived, but out when I was taking another icthy with it all the megs and mantas started to attack it. I’m so confused the other ones didn’t make anything aggro