Surprisingly in mobile ark, if you attack achatinas with raptors, as I have learned from my own experience, you can get angler gel. I have never gone past the shallows in the ocean, yet I have multiple stacks of angler jell. Hope y’all can find this helpful. Don’t know if it works on other versions of ark though.
Tame a kaprosuchos and swim to one of these bad boys and do it's alternate attack it will grab it in it's mouth. walk onto the shore where its safe and have another person feed it while in the gators mouth (if you unmount it drops it) it wont attack or die because it's technically not on the shore.