n. A local English name (current in Yorkshire) of the coal-fish, in allusion to the bluish color of the back.n. The blue-backed salmon or nerka, Oncorhynchus nerka, known in Idaho as the red-fish.n. In Maryland and Virginia, the glut-herring; a herring-like fish, Clupea æstivalis, without vomerine or palatine teeth, with the lower jaw projecting but little, and the peritoneum blackish. It is much like the alewife, but of less value.n. A local name in Maine of the blue-backed trout, Salvelinus oquassa.n. The lake-herring, Argyrosomus artedi, of the Great Lakes.n. A banknote of the Confederate States. Compare greenback.