They told us in school that the guts should come out immediately because as soon as the fish dies, the acids/enzymes/whatever in the guts start to eat away at and generally fuck up the meat. So, most fish you buy even whole will already be gutted, at least around here. However, they will not be scaled. Though I recently bought a whole bass that was not gutted and I was somewhat surprised by that. Interesting. Where I bought it, they were about to scale and gut it for me to take whole, as they would normally do, but I insisted they leave it untouched. Silly me, I know. They aren't bad. I wouldn't go as far to say they are delicious. But maybe I've just never had properly prepared fish eyes. There's an interesting story I read about a man lost at sea who subsisted on nothing but fish for the course of over a month. At first, he would only eat the raw flesh, but after a while his body started craving other parts of the fish, such as the liver, heart, and eyes. Mainly because eating only the flesh supplies one with a limited source of nutrition, and these other less desirable parts contain other essential fatty acids and nutrients one needs to survive. Eating the eyes, in this case, provided him with fresh water.