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Butterfish is a totally different fish from sable/black cod. Perhaps you're correct that they call sable "butterfish" in this or these instances, but butterfish is an actual commercial fish which is torally different. Butterfish is a thin but deep fish (in shape like a pompano), whereas black cod is long and pretty thin, a fresh water fish which has those little bones which get in the way of everything, but has a flesh which tastes great, and works best either smoked or in paper-thin slices against the bones, so that each bone fragment is the thinness of the slice, then cooked quickly in a bowl of soup or broth in a chafing dish.