Do you ever wonder what the white stuff is that seeps out of your salmon when you cook it? According to Food Network, it is protein called albumin. When you cook the fish, the muscles contract and the albumin surfaces. It's edible but you can wipe it off with a paper towel. You can see it more in overcooked fish, which is the reason why I see it all the time. So there, now you know it and shall not wonder anymore.