If the piranhas they say are some of the most annoying, these bastards are deadly af. Mantas pierce through armour, shred it, while these guys stun you. Include the piranhas, and omae wa mou shindeiru. Best bet is Basilosaurus, or decent levelled mosa ( not recommended as shock attacks are the weakness of the mosa) and tusoteuthis, because of the attack range. I hunt these down to total extinction, then gladly save up the bio toxin they drop for giga, royal griffin ( I play on mobile so...) or taming of other whatnot thingys. If you want to kill these early game, as they are seen on the shore quite easily, just grab a few spears and/or pikes then slaughter these bastards. Lure them by walking until swim mode into the water, then depending on your movement speed go backpedal to the shoreline. This will successfully lure them near you and you can slaughter them as you please without endangering you or your mount.

This is the kind of creature I'd happily hunt to extinction...

Never go near it with your Dino, it will kill you, your Dino, your friends, your family, the guy down the street, some guy over in Africa, all while they won't do a thing to attack it.

Go for a swim they said, it'll be fun they said...

i threw a spear at a group of these guys, then my sarco went to kill them and I watched in horror as she flew through the air dead, now all I do is kill every last one of these guys

says it’s early game? I heavily disagree with that and they might kill a giga given the right circumstances
Ubfoot so can see..

Seductress of the sea,
I shine most beautifully.
But get near,
And it's schockingly clear
Why you'd better stay far from me.

Learned the hard way that bouncing on their tops isn't an option. Nemo lies ;-;
~CL1

Lost almost all of my tames from a jelly fish...... That's it I wanna start a business of slaughtering jelly fish and i'm not gonna stop it.

Rip the 32 tames I had they all died to jelly fish 😭

The most overpowered creature i've met

These things spawn on The Island at the bottom right of the map near the Lava Cave. These cheeky little buggers are more than happy to ruin your day by swarming and stunlocking you and your tames nonstop unless you are on a Basilosaurus, which is the only creature that is immune to their attacks. If you don't have a Basilosaurus, lure them close to shore and cheese it with a spear or pike, better yet pray that they beach themselves and die.