Be very careful near them I was cruising around with my Dino’s in the sea( a level91 bronto a rex a sarcophagus and a wyvern )I got onto my sarco and went under to get silica pearls and I see my bronco died so I got to surface thinking megladons then out of nowhere I get shocked then terror

Wyvern dead rex dead sarco dead bronto dead me DED

In ark mobile and you are a beginner you can shoot it with a bow and a stone arrow

They have a long agro range so be careful near them. They are also found at the surface a lot. I suggest to try to get to shore, then you can try to kill it. Try to get away quickly since there deadly.

Tame a basil( unaffected by shock ) and eat all jellyfish you can then make shocking tranqs with the collected bio toxin for easy taming of all dino

Tame a basilosaurus to kill it, basilosaurs don't take shock stun from these guys and they work great for harvesting biotoxin

There is a glitch where you can bring them to shore and they can’t attack you, effectively taming them, me and my friend did this in a multiplayer for fun

It's really easy to kill these guys all you have to do is make them follow you to the shore and then you shoot them and you have bio toxin

three of these and 1 meg killed my baryonyx be careful when hunting megs on oceans scout your surroundings killing these cnidaria before you hunt

I finally tried attacking some of these with an expendable spino, and I figured out that you just need to attack the jellyfish before they attack you. If you level the damage to about 250%, you can kill the average jelly in three hits, and they harvest more biotoxin than other creatures.

(My giga harvests 12 per jelly, baryonyx is 16 per jelly, and the spino is 18 per jelly). I promise you guys that it’s real. It’s only a problem if you let your tame get too close and then get stun locked by the electric attack of the cnidaria. Keep your distance and murder these suckers for the best narcs in the game! Good luck

You can kill them if you go to the Shore and if they follow you just hit them with your axe or or something so you can you can you kill them I did it once cuz a drop spawned bright by 2 and I killed them afterwards when I got my stuff back and the drop

Rip fang and Mary who tried to follow me

I saw it happen as my lystrosaur swim down the river when she was attacked. I was shocked when she died. Then my moschops also swam and she died too

I lost my lystrosaur and mos chop to 2 Cnidaria

These jellyfish sting and are dangerous. They killed my first dinosaurs

once.

Have a crossbow in your hotbar AT ALL TIMES. Sometimes jellyfish will happen, and you must be ready

Only reason I've died 2 times is because they exist. Easy to kill with a spear tho, atleast they give you bio toxin which im planning to use for a pteradon or something else 🤔

I think the killer jelly is a mix between a box jelly, deep sea jelly and a Man’oWar. The Man’oWar is not a jelly but like it and it’s sting almost burns you, the box jelly also would contribute to the sting and the deep sea jelly will get the glow. Lik if u think so

poke it with a spear and get it's very useful bio toxin.

I hate these guys they killed my friend and trike

Guys you gotta agree with me, These little blue jellyfish mfs are annoying