1806  (1956)  Bye boat fishery wholly laid aside; formerly employed several thousands.
1840  (1860)  A considerable quantity were also taken by what were termed by-boats. . . .
1956  The by-boat belonged to a merchant or fisherman in England, who employed a crew to operate his boat--the word "by" may refer to its being laid "by" for the winter, or to its being an "extra" to the fishing ship.