Size— The largest four specimens yet seen measured 18¼ and 18½ inches; 19 inches, weighing 3 pounds; and 20 inches, weighing 4½ pounds and 24 inches, weighing 7 pounds
General range— Outer part of the continental shelf from the latitude of Chesapeake Bay to the vicinity of Sable Island, Nova Scotia, and perhaps to the Laurentian Channel that separates the Nova Scotian Banks from the Newfoundland Banks. It reaches the inner parts of the Gulf of Maine now and then as a stray.
From Fishes of the Gulf of Maine by Bigelow and Schroeder, 1953
Online courtesy of MBL/WHOI http://www.gma.org/fogm/Zenopsis_ocellata.htm
Good Morning Gloucester 
And from Smithsonian.com … How did this fish get its name?
John Dory: The origin of this fish name is slippery. It sounds like it was surely named after a person but, according to Larousse Gastronomique, the English name is a corruption of its French nickname, Jean-doré. This was in dispute even a century ago; others contend it comes from the Spanish janitore, because St. Peter was the “janitor or porter” of heaven. The fish’s other name, after all, is St. Peter’s fish. VERDICT: UNCLEAR
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