Click here for the nutritional facts on cooked eel. They're a pretty good source of protein, but very, very high in fat and cholesterol. And of course they're horrifying.
Eels are mythical, un-killable creatures from the black abyss. I know this as true and absolute fact, and for that I fear them. If ever they should develop intelligence and rise up against us, we are doomed to be their landlocked slaves. Or dinner.