I saw the author, my friend Lisa-ann Gerswhin give a talk recently. The startling points I came away with are: 1) There are several strong self-reinforcing loops that dramatically help jellyfish, at the expense of human-valued things -- like fish. 2) Jellyfish are becoming so abundant they're jamming water inlets... to nuclear power plants and everything else. 3) Jellyfish can eat stuff (fish), but nothing can eat jellyfish -- they're a completely different food chain.