They are rapidly increasing in the world's oceans due mainly to Man. Most variations breed under man-made marine structures such as piers. The killing off of predatory fish for human food allows the transparent creatures to vastly increase in number.
Two million workers became unemployed when the comb jelly native to North America invaded the Black Sea in 1980 and destroyed anchovy fisheries. Only the introduction of a jelly rival saved the day by consuming the destroyers.
This could be the subject of a horror movie: The tentacled monsters enter the water supply of major cities, die there, then rise up in their thousands from polyps emanating from detritus of parent corpses.
reverse jellyfish years jellies thrive change millions ocean trend global species overfishing climate british mcs survey numbers blooms records data strong increases oceans evidence karmic device punish planetary transgressions chaos set create masses opens conditions rapidly age rising jelly society researcher headlines coastal science university spawned cycle year swarms brotz mediterranean people regional populations increase support natural bay gibbons human future || jelly || = || , ||