One-third of global marine catch used as livestock feed
 

I had no idea! :shocked:

One-third of global marine catch used as livestock feed
Jeremy Hance, mongabay.com - October 30, 2008
Despite continuous warnings of emptying oceans due to overfishing, a new report finds that one-third of the world’s total marine catch is not feeding
humans, but livestock. The fish are ground-up into meal and fed to pigs, poultry, and even farm-raised fish.
http://www.seaaroundus.org/OtherWebs...pdf (3pp, pdf)

It's used in fish farms and for vegetarian livestock, who are fed fish meal to accelerate their growth (so they're ready at 9 months, instead of at 12 months).