1. Ride on Ichthyosaurus since nothing will agro on you in the water unless you feed a basilosaurus food and mantas see that.

2. Crossbow ONLY with tranqs or longneck rifle with darts to knock it out.

3. Have some bio toxin beforehand (10 is more than enough)

4. Feed raw or prime meat because fish meat is less effective.

5. You have got yourself a shark pet.