Bring a beryonx and slot of tranq airos

Plesiosaurs are the quetzals of the ocean change my mind

These guys are great and super fast and also very strong. Warning when your gonna go tame these guys bring a sarco or an icthy , they also spawn In 2,s or 3,s so be careful because these guys do a crap ton of damage .

They can't fit through the resource caves' entrances. Just lure it into one and pull out your crossbow/harpoon gun for the knock out. Just be aware of any nearby megalodons, as they can fit into the cave easily and ruin your swimming session.

The weakness of plesiosaur is the depth limit. Use it to tame it.this also work for mosasaurs. Scuba tank and flipper recommended