Tamed my first one with raw prime meat from killing plesiosaur took about 17 and using their prime meat to tame a level 15 with a 98% taming effectnesss about 30 minutes using a harpoon and tranq spears to knock it out i made 29 took about 23 although I think i misses 5 or 6 shots so take that with a grain of salt but use a deinosuchus they take 50% less damage to the head so face it head on make sure it has a high health pool 12k or more which is extremely easy to get to one of mine is level 180 close to 13k health and 400% damage thay tank the ocean creatures as long as you don't get surrounded by 30 megs like I did sadly the Mosasaurus did not survive before I could crypo it i had 30 megs and two alpha 110 megs run up on me so sucks for me hope you guys have better luck then me