These guys are easiest to tame in crystal isles. The white shoals tend to have them in the sectioned off waters. I found one in one of the... divets? where the giant crystals are, and the edges were too shallow for it to get out, No extra rays spawned and megalodons couldn’t get to me. The shallows aren’t deep enough for them to pathfind through but I could get him out manually with a nice jump. It also doubles as a safe home for him (he’s only level 20 post-tame, so not as OP as basilos. normally are.