How much tuna is caught each year?

Question: 

How much tuna is caught each year?

Answer: 

As of 2009, catches of the four principal market species of tuna – skipjack, yellowfin, albacore and bigeye - have been hovering between 4 and 4.5 million tons annually worldwide during the last several years.

Skipjack, the primary species for canned and pouched tuna, makes up 60% of this catch, followed by yellowfin (24%), bigeye (10%), and albacore (5%).