They will kill you off faster than the Shining, and the can also paralyze your Dino and you. I wouldn't use a water Dino, I'd find one, check if any others are there, and then I'd use Crossbow and good tranqs.
Hate them I let my Meg (level 10 ) swim around because I didn't think anything would attck it 3 minutes later your meg was killed by this mf I am crying now I cant believe it did that. I only new to ark I have been playing for 5 days now leave a like so others see this
i remember one time i shot the jelly with a crossbow and it tried to get me so i ran away and i was fast enough to get on land but then the jelly got to the surface ( bcoz it tried to get me ) and died.i have just avenged my diplo 1 up = 1 rip for barnie