There is actually a way to tame these suckers! The food they eat is “admincheat forcetame”

It works! :D

(by the way not for mobile only pc and console)

Get in the water and give it anime body pillow then you can go in the water any time without a problem

You cannot tame a jelly fish but you can kill it and use it's wonderful biotoxins as narcotics to tame other huge animals

Their attacks shock you (which makes you unable to move), and they often stick in groups. If you get surrounded by these, you're basically dead. Don't use melee weapons, use a crossbow.

They drop bio toxins, which can be used for a new tranq dart that's more powerful AND shocks the target.