Just Jellies

There are things swimming in the oceans that we will never see or ever come into contact with during our lifetime.
There are also creatures that we know of and use their carcasses for everyday purposes like cosmetics and food.
Now comes an unexpected, and unknown, species of jellies that will change how we feel and use the abundance of our seas.
Their ravenous devouring capabilities will eventually consume everything living in the world's oceans and connected waterways.
That unquenchable hunger also extends to anything that just so happens to enter the water too.
US!
Humanities love for the sea, rivers, and lakes, will never be the same after their gobbling up everything arrival.
They're Just Jellies.
Right?