1897  One of the most delicious of deep water fish is the skil, or black cod, as it is sometimes called.
1907  Skil [is a] local name of the black candle-fish (Anoplopoma fimbria), an excellent food fish of the waters of the N. Pacific Coast. . . .
1964  The sablefish . . . is smoked and sold under the name of "black cod". . . . The sablefish belongs to the skilfish family . . . the giant skilfish . . . may attain a weight of 200 pounds.