The State of World Fisheries and Aquaculture (SOFIA) attributed the increase in global seafood production to aquaculture; 51.7 million metric tons of farmed seafood was produced in 2006, compared to 92 million metric tons of wild seafood.

Then you can add 10-30% for bycatch depending on what reports you look at. That would add 9-27million metric tonnes to the already 92 million metric tonnes.

A great deal of concern has been expressed by fishery managers and conservation/environmental groups that bycatch and discards may be contributing to biological overfishing and altering the structure of marine ecosystems.

The urgency of the current fisheries decline has begun to galvanize both governments and the private sector, at least in the developed world. Such nations as the United States, Canada, and the members of the European Union have recently adopted tougher fishing controls and have started to shrink the size of their fishing fleets.

An international group of ecologists and economists warned that the world will run out of seafood by 2048 if steep declines in marine species continue at current rates, based on a four-year study of catch data and the effects of fisheries collapses.