Green’s Dictionary of Slang

Atlantic ranger n.

a herring.

1883		Good Words 378: Peas-pudding, and hard-boiled eggs, rubbing shoulders, as it were, with Atlantic Rangers [F&H].
1890		London Dly News 1 Feb. 4/7: An ‘Atlantic ranger’ is the herring’s finer name. The same end may be served by ‘Glasgow magistrate’ or ‘two-eyed steak’.