Depends. According to the fda, light canned tuna is considered "low" in mercury, whereas tuna steaks (albacore tuna) are considered "higher" in mercury than their canned counterparts. As such, one can safely eat up to 12 ounces of light canned tuna per week, or up to 6 ounces of albacore tuna per week. This is assuming no other consumption of mercury-containing seafood.
Read below. The fda had released prior guidelines about safe fish intake, but the latest recommendations finally address tuna. Women of childbearing age, pregnant and nursing women, and children may: * eat up to 12 ounces a week of canned light tuna and other low-mercury fish, such as salmon, shrimp, catfish, pollock, and fish sticks. * eat up to 6 ounces of fresh or canned albacore (white) tuna.