I love tuna fish! How long will it take for me to get mercury poison?

Tuna Tales. Likely never, unless you consumed enormous quantities of this fish. While tuna and several other large game fish tend to concentrate mercury and several other heavy metals in their tissues, much of this can be controlled by choosing the source of your fish. Purchasing tuna from reputable countries can ensure more quality in the fish you consume. This is also true of farmed fish like tilapia.