You can't tame these creatures, but you can harvest their biotoxin after killing. Biotoxin is super useful for keeping a creature unconscious when taming. You can harvest about 12 from each Cnidaria.

These guys are annoying when i step in the water they attack and kill me. I know this jellyfish species its the deadly box jellyfish that that kills you in the ocean. Me and my carbonemys are swimming in the water to find dossiers and box jellyfish attack me and dies. 1 like= remove box jellyfish

Basilasaurus is pretty much immune to these guys attacks.

Their only utility other than giving biotoxin is being annoying as hell

Biotoxins are used for toxicant arrows, but on low levels they will substitute the mass use of narcotics. Its also not hard to get, on mobile thats even more true.

Bait them to a beach, just stepping in deep water draws their aggro, once they are near, hit them and step back as sometimes they will try to charge you a bit more even beaching themselves in the process, after it its safe to farm.

Apparently I haven’t seen or heard of anyone talking about Bio Toxins being used as an alternative than Narcotics!

I know many people will say “You save up to use in Toxicant Arrows”!

Truly understandable but! This is an Greater Alternative to feed your creatures Bio Toxins rather than narcotics, If you have no choice or rather is low level to make use of it.

If you need say a gallimimus you need to kill on of them they give a lot of biotoxin just gather a bunch of rocks and craft a sling shot then find one close to the shore the kill it when their dead you can pick it up then

harvest all the biotoxin (but don't eat it) it gives a lot of torpor when eaten

Because the ocean is really dark during the night, I decided to trap these guys in a stone railing box cage , so now I have a luminating water source if I go swimming.

Update Idea for this jelly boi: Since they don’t have eyes, ears, or even a nose form that matter so they swim aimlessly and can’t see where there going, they glow brightly at night time or in deeper water, they are smaller, weaker and stun lock doesn’t last very long, each individual jelly boi killed overs 3-5 bio-toxin but they wander in big groups. I hope the devs can take this into consideration, R.I.P. to the people who lost there dinos to these guys.

You can farm Biotoxin from these using Basilosaurus as it is immune to it's stuns therefore doesn't jake damage from them at all