These instances of interference with trade continued for centuries, and we learn that in 1533 it was enacted that butchers should sell their beef and mutton by weight--beef for 1/2d. a pound, and mutton for 3/4d. Stow, in relating this, adds that at this time, and not before, 'foreign' butchers were allowed to sell their flesh in Leadenhall Market. _Fishmongers._--The information relating to the sale of fish in the City Records proves how largely the population of London in the Middle Ages depended upon its ample supply. There was great variety, and a large number of enactments were made as to the sale. The fish mentioned in the _Liber Albus_ as being sold in the London market are: Sturgeon, cod, ray, herring, bass, conger, sole, mackerel, sur-mullet, turbot, porpoise, haddock, sea-ling, sprats, salmon, shad, eels, pike, barbel, roach, dace, dabs, flounders, lampreys, smelts, stickelings, oysters, mussels, cockles, whelks, scallops, and stock fish (imported from Prussia). Of these, sprats, herrings, mussels, whelks and oysters are most often mentioned, but lobsters, crabs and shrimps are not alluded to. Fish was not allowed to be sold retail upon the quays. The stalls in Stocks Market were occupied by the fishmongers on fish days, and by the butchers on flesh days. Other retail markets for fish were held by the wall of St. Margaret's Church, New Fish Street, by the wall of St. Mary Magdalen's in Old Fish Street, and in Westcheap. Stow writes of the first of these places: 'In this Old Fish Street is one row of small houses, placed along in the midst of Knightrider Street which row is also off Bread Street ward. These houses, now possessed by fishmongers, were at the first but moveable boards or stalls set out on market days to show their fish there to be sold; but procuring license to set up sheds, they grew to shops, and by little and little to tall houses of three or four stories in height.' Salmon, cod, and herrings are mentioned in the _Liber Albus_ as being sold in the shops in the neighbourhood of Queenhithe. Old Fish Street, and Old Fish Street Hill which run from it to the Thames, with Queenhithe as their landing-quay, formed the chief fish market of London before Billingsgate supplanted Queenhithe. A curious regulation is found in a royal ordinance in existence as early as the reign of Henry III., by which the first boat in the season with fresh herrings from Yarmouth was forced to pay double custom at the quay.