Use transponders. Trust me.

Tag one and tag your raft and you will not lose it no matter how far it swims. Use a basilo so squids and jellies dont get you. Take 2 scuba tanks at least and try with high damage xbow and about 200 tranqs. Use raw mutton and drive raft straight on top. Keep either a live sheep or refrigerated mutton or warp to bed from drop or obby with mutton on you. Ez tame. As easy as a giga if you do it this way.

...if you know what you're doing

- CG