In chapter 11 of The Just Men of Cordova (1917) by Edgar Wallace, the author was describing an old man who was changing the topics of talking very quickly:
The old man had a trick of striking off at a tangent; from one subject to another he leapt like a will-o’-the-wisp. Before Horace had framed half a dozen words the old man was dragging his unwilling victim along a piscatorial road, and Sir Isaac was floundering out of his depths in a morass—if the metaphor be excused—of salmon-fishing, trout-poaching, pike-fishing—a sport on which Sir Isaac Tramber could by no means deem himself an authority.
I don't get what's meant by "drag him along a piscatorial road"! Does he mean that "he make him trying to catch him, as if he was a fish, from one topic to another"?!!