If you are new to regular ark use EXTRAORDINARY kibble not quetzal kibble for mosas and use an argie trap but with behemoth gates, also shouldn't be carried by tusos or shocked by jellyfish, plus it should have a bleed like a shark and a better appearance
Great all around underwater. Powerful and tanky. I have noticed they are able to survive a jelly fish swarm. I have mine kill around 40 jelly fish while being shocked.
A max level, imprinted mosa with a high armor saddle is virtually unstoppable. I had a green one that I bred and named Jormungand after the world serpent in Norse mythology. It’s strength was mythical! (No pun intended)
These creatures in real life actually needed to surface to breath much like whales, also they stayed near the surface of the water, never straying to deep.
My mosa has 14K HP and over 300 melee with an acendent platform saddle and he can kill anything in the ocean. Even alpha Mosasaurus and still have 13K health. (I play mobile.)