Those cnidocysts add a little tang to the tongue, kind of like a hot sauce! Jennifer at Shifting Baselines brings us the burger d'Jour, or the reality of the United States' current consumption of seafood. If things go as projected, all that will be left are Jellies! Is that so bad? The japanese eat them, but jellies aren't very nutritious. Leatherback sea turtles, a jelly specialist, need to consume a plethora of jellies to maintain expensive physiological processes like growth, metabolism and endothermy.
Another ENORMOUS problem is the use of the word jellyfish. Not only is this wrong on so many levels, it connotates a paraphyletic meaning if you will. Fish are the last common ancestors of the Amniotes (including humans), all of which contain backbones. Clearly this isn't the case. Morphological evidence suggests that jellies, though sometimes with a rigid hydrostatic system, rock-hard carbonate skeleton, sand grain and mucus tubes, or just plain ole incorporating sediment right into the body wall, do not contain contain a backbone, nor a notocord, nor pharyngeal gill slits, or dorsal-hollow nerve cord. Molecular and morphological evidence (see trees posted at Evolgen) also places the Jellies as a more or less basal group in the animal phylogeny and well separated from fish.
Next: Sea Stars aren't fish either! It is the stated mission of The Other 95% to strike from common usage the terms "Jellyfish" and "Starfish".