1845Square sterns were built to replace the pinky, then half-clippers, then regular clippers.Economy and Industry, Maritime & Fishing Industry
As the feeding grounds for fish moved further from the shore, innovations to accommodate the new realities of the fisheries emerged. Larger vessels that could hold more tonnage and travel faster and rail transport all contributed to the exploding growth of the fishing economy. In six short years, from 1841 to 1847, tonnage increased from 357 vessels, with a total of 17,548 tons, to 503 vessels, with a tonnage of 30,724 tons.
The Fisheries of Gloucester from the First Catch by the English in 1623, to the Centennial Year, 1876. Gloucester, Procter Brothers, 1876, http://archive.org/details/fisheriesofglouc00glourich.