Grab the most lethal harpoon launcher you can find and get chitin armour, I lost a low level Mosasaurus because of these wretched things

If you wanna kill these, but you're a beginner, just use a slingshot. Or if you can, use a bow and stone arrows. Harvest their bodies, they can't shock you if they're dead. They give bio toxin, which is a very effective narcotic.

Almost always better to use a projectile attack type

just run if you see a jellyfish just run

Fun fact, if you tame a moschops on the island snd level up its melee alot then lead these to the surface and you can kill them! I did this and got 100± bio toxin using this

Great for biotoxin but I have lost countless spines to these freaks, and occasionally a Rex. However they are much better then electromorphus but still, I hate them for killling the first spino I ever tamed.

Guys please, what do I do? I want to tame a Basilosaurus, but these annoying things are everywhere, I am near the Basilosaurus but if I approach to feed them the cnidarias will kill me and my Megalodon (lvl 164 with TEK saddle) help-

Even a single one can kill my tamed Giga.Well,at least I still have Basi to revenge

This thing loves to kill my my sharks

Kill em then Use a chainsaw and jump at them once they died. (Use a boat to jump from)

I thought “I wonder if my pelagornis will collect their bio toxins”. Oops

l lost my bary to these vermins a few days ago lesson learned dont take your bary into cnidaria infested water

How to kill

1 Screw it

2 trap and destroy

3 Rocket launcher

4 A.k 47

5 Really power full dino

6 some How move it

Tip :only works on console: If you and or dino dies Quickly Go to home and close the game :you will go back to your last save, I recommend saving the game before you go near one

On mobile if you have a creature knocked out and need to keep unconscious their biotoxin raises it by 80 and wont harm them. Not sure on consoles

Just use a spear, pike, or a ranged weapon. But just bring a lot of spears if you choose that option.

Just kill em from a raft it's easier

They are easy to kill if you lead them to land. Just use a spear and stab them as many times as your heart desires. However be careful cause 4 if these killed 7 of my dinos when I wasn’t paying attention.

I like to shoot it from the water shore so when it chases after me it gets caught on the shore and then just shoot it and it can't kill you

Everyone hates these they ruin everything I tried to tame a icthyosaurus but they got in the way

Very annoying . once I had a very good run .and I went through the water to get to base and kill a para and then a freaking manta and cndreia

Kills me .honestly the best way to deal with these guys is using a bow better journeyman bow