A great beginner tame, once you have an icthyosaurus, you can swim up to it and passive tame it. I just tamed one, and less than 5 minutes after I tamed a level 4, it’s killed 2 megalodons and 4 mantas. Like so noobs and beach bobs can see.
Good fighter, immune to jellies, supernatural healing boost at the surface, produces oil in its inventory, impervious to squid grabs, looks kinda cute too, only one bad thing about it: it gets squashed in the deep! Only slowly but the damage is there!
A little fact: If you have a basil and you are in the ocean and got dismounted from your mount (like an ichy) and you have a tamed basil with you , make him follow you and swim directly to the surface.The basil will follow you and push you up wards (if it doesn't, just make it swim close to the surface and just swim/climb onto its back) your welcome! :)