How can I tell where my Seafood is from?

I am playing Junior hockey this year and I'm staying with a billet family they stock the shelves with no name brand canned tuna..! Anyways google doesn't seem to show useful information anymore so I can find nothing about the origin of this seafood! Can any body point me in the right direction because I have avoided seafood all together unless I know for certain it wasn't from the pacific.. Thank you so much!