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A fishwife or fishlass is a woman who sells fish. In this context, the word wife means woman rather than married woman. This usage stems from Old English wif (woman) and is similar to the German weib, also meaning "woman". This sense of the word is still used in Modern English in constructions such as midwife and old wives' tale. "Lass" means girl or young woman, particularly one who is unmarried.
Often the wives and daughters of fishermen, fish wives were notoriously loud and foul-mouthed, as noted in the expression, To swear like a fishwife. One reason for their outspokenness is that their wares were highly perishable and so lost value if not sold quickly.
London's traditional fish market was frequented by such types who were known as "the wives of Billingsgate". "They dressed in strong 'stuff' gowns and quilted petticoats; their hair, caps and bonnets were flattened into one indistinguishable mass upon their heads. ... They smoked small pipes of tobacco, took snuff, drank gin and were known for their colourful language."
In the 18th century, fishwives frequently appeared in satires as fearsome scourges of fops and foreigners. Their vigorous and decisive mien was contrasted with that of politicians who were, by contrast, portrayed as vacillating and weak. For example, in Isaac Cruikshank's A New Catamaran Expedition!!!, a fleet of fishwives sails across the Channel to terrify the French and shame the Prime Minister, William Pitt.
William Finden noted, in 1842, that the wives and daughters of the Cullercoats fishermen searched for the bait, digging sand-worms, gathering mussels or seeking limpets and dog-crabs. They also assisted in baiting the hooks. In addition to this, they carried the fish to the market to sell them. "When fish are scarce, they not unfrequently carried a load on their shoulders, weighing between three or four stone, to Newcastle, which is about ten miles distant from Cullercoats, in the hope of meeting with a better market."
Aw's a Cullercoats fish-lass, se cozy an' free
Browt up in a cottage close on by the sea;
An' aw sell fine fresh fish ti poor an' ti rich--
Will ye buy, will ye buy, will ye buy maw fresh fish?
The Cullercoats Fishlass became a popular subject of American artist, Winslow Homer, who resided in the pictureque fishing village, to paint, from the spring of 1881 to November 1882. Homer soon became sensitive to the strenuous and courageous lives of its inhabitants, particularly the women, whom he depicted hauling and cleaning fish, mending nets, and, most poignantly, standing at the water's edge, awaiting the return of their men.
Jean F Terry wrote, in 1913, "The Cullercoats fishwife, with her cheerful weather-bronzed face, her short jacket and ample skirts of blue flannel, and her heavily laden "creel" of fish is not only appreciated by the brotherhood of brush and pencil, but is one of the notable sights of the district". 
William S Garson, in his 1935 book, The Romance of Old Tynemouth and Cullercoats, wrote: "The Cullercoats fishwife plays a man's part in helping to launch the lifeboat, frequently wading waist-high into furious and ice-cold waters, and she never hesitates to allow her man to take a place on the boat, though he may go to face death and disaster." 
The Scottish fishwives of Newhaven had quite a different reputation, being noted for their beauty and industry, and celebrated by royalty — George IV and Queen Victoria. They were hard-bargainers though, and all the fishermen of the Firth of Forth brought their catches to Newhaven for the fishwives to sell in Edinburgh. The fishwives wore distinctive costumes of blue duffle coats covering layers of colourful striped petticoats with a muslin cap or other similar headdress. Their fish, such as haddock and herring, were carried on their backs in creels.
Statue of the Nairn Fishwife
The fishwife, Holland 1672 by Adriaen van Ostade
Newhaven fishwife with creel (by Alexander Ignatius Roche 1861–1921)
Bronze cast statue of a fishwife and little girl, Peterhead
Fisherwomen, Cullercoats, Winslow Homer 1881
Newcastle based film youth film company, ACT 2 CAM are set to make a film about the life of a young fish wife, entitled "The Cullercoats Fishlass". The story follows the fortunes of a Cullercoats fishwife living in Edwardian times. 
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