Really broken in the water so be careful, it will stun lock you to death. Always runs away the shot before it will pass out so if you hit it again just follow it. Oh yeah it stun locks in water automatically when you tame it. RIP Megaladons.
Bolas work on it, I just bola them and beat them with the club, don't bother trying to get fish with food in its inventory unless you have a ton of fish in it,or there's plenty in the area, "untames" too quickly.
If one of these spawns near your base, ready a cross bow and climb on top of a rock at least two stories tall (they can climb up to one story) and aim a crossbow at it. Fire attacks untilnit runs away and chase it and start shooting at point blank.
Good tame if your low level. Make sure you have two to three bolas and have your slingshot with you. Have at least 40-50 stones. Get to a cliff ledge and begin pelting it with stones. (The cliff doesn’t have to be high, just enough for him/she to get stuck.) Throw a bola after firing a few stones and then fire again. This helps you hit the bary easily without it moving. When unconscious, make sure to feed it fish and narco. Shouldn’t take too long to tame.