Up to 15 tentacles grow from each corner of the bell and can reach 10 feet in length. Each tentacle has about 5,000 stinging cells, which are triggered not by touch but by the presence of a chemical on the outer layer of its prey.

When battling these creatures make sure not to get tames involved, just bring a sword and a in 1-2 slices they will die

If you are annoyed by cnidira(jellyfishes) tame a basilosoraus or tusso , basilo is easier just kill the mantas surrounding it (using sarco or baryonx , meg) and feed it exceptional kibble or prime meat (raw meat is fine as well) the use the basilo to fight the jellyfishshes since they can't be stunned or shocked , killing jellyfishshes becomes easier with the basilo

play on scorched earth OR extinction to never see this f***

Keep a far distance from these things snipe them from a distance, they will come after you and camp at the beach you ran on to get away they killed my bary seaweed and my spino mintchocochip. If you see groups of them form kill them off when you can

Just grab a shot gun and just blast them out of existence

Kill on sight. VERY NOT FRIENDLY. They will totally obliterate you, your tame, your tames tame, your tames babies... they will even float up out of the water to attack your flyers. Ok that's not real but they're freaking ridiculous.

Is there a mod that removes these and eels from the game?

Only fight them close to the bank. Get them angry and dash to shore. Then, stay out of reach of their electric tentacles and hit with a weapon. Make sure they are close to shore enough so you can stand.

Afterwards, harvest the Cnidaria's potent Biotoxin!

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.

Steer clear, my Carno who could 1v1 Rexs got taken out by one of these.

I GOT A WAY TO MAKE A TORCHER CHAMBER FOR THEM!

First make a little pen in the water with wooden spikes

Then spawn some in there or get them in

Get a ascendant whip and or a ascendant pickax

Then hit ‘em and kill em

*laughs in dilo ranged attack and spears*

So I’m taking a dip in the sea, see three megalodons and whistle my lvl 215 spino that I obtained at a very early level to attack them. This spino is my prize… the Apple of my Ark eye. Anyway, I see three idiot blue jellies WAY FAR AWAY rise up to attack my spino. My spino is just circling the megs and trying to kill them. Little does it know that an electric death awaits it. I sat there in horror, sure that my beautiful spino would die, but(and it is a huge and relieving but), my spino kills the megs just in time, and comes to shore. I ended up getting some biotoxin at the end of the trip, too! All good. BUT BE CAREFUL THEY WILL KILL YOUR LEVEL 215 SPINO. I’ve lost many tames already. The only reason I’m telling you guys this is because there is hope. Good luck, fellow survivors🫡

Don't recommend swimming close unless you have a Basilasaurus, lost my favorite itchyasaurus, her name was flipper , but I learned if you ride a raft, you can get close and stab with spear, easy removal of killer jellyfish.

I found an invincible one:( :( :(

These guys give bio toxin which is 2x more powerful then normal narcotics.

If you sea glowing in the sea do not go to it

Me goes to glowing

Fieind do not go

Me goes anyway

Me dies a slow and shocking death

You have entered the Encountering category? I have 3 words for you.

KILL

THEM

ALL

I rode my 138 Sarco into the sea collecting oil at sea, finished an oil rock, turned around and saw 5 of these bastards ganging up on him while he was sleeping . We both died, take these on by range with crossbows.

F in the chat for my lv 138 “Big Boy Gator”