Yes, heads for my fave carp ala Jewish, a traditional Polish Christmas dish. At least in southern Poland.
Sorry Paw, in the civilized part of the world, like Michigan, Karp heads hardly qualify as a fertilizer; the whole carp is a good feed for the roses. Even pike is very tasty if
Y bones are removed, too slimy for refined tastes; in other words, sh*t fish, thousand upon thousand karps, are rotting on the shores of Grand River.
Salmon, all kinds of trout, volley, yellow perch, bluegill, now that's what I call edible fish.