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They taste ridiculously good. However I am conscious of it, and I rarely have it.

Also, they are part of the few edible maritime species whose populations are increasing (http://www.humanosphere.org/environment/2016/05/rapidly-chan...).

I believe this is only a current indicator because of less predators. Ie over-fishing.

We don't know, but most studies that look at what does well in acidic oceans come up with jelly fish. Lots of jelly fish.

Yum, heavy metal infused jelly fish...

Interesting!