We're 'fishing down the food chain': first killing off fish near the top of the food chain, then smaller ones, and now jellyfish, squid, crabs and sea urchins. 90% of all large fish have disappeared in the last half century. Jellyfish catches are now way up - in part because there's less other stuff left, in part because they have fewer competitors.

Thanks to +Thomas R. for pointing this out. See also this 2005 Los Angeles Times report on 'the rise of slime':

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