1931, Grace Hegger Lewis, Half a Loaf, H. Liveright (publisher), page 225:And Susan, sure of this inevitable answer, would ask Cook to pop into the fishmonger for a nice bit of salmon, ...
1990, Elizabeth Jane Howard, The Light Years, Simon and Schuster (1995), ISBN 9780671527938, page 294:A nice woman at the fishmonger in Earl’s Court Road—she had to walk miles to find a fish shop—told her how to cook the fillets of plaice she bought.
2007, Leslie Ann Bosher, To the Manor Drawn, Murdoch Books, ISBN 9781921259890, page 157:Cornish peppered mackerel, smoked haddock, Scottish herring and pearl-white skate wings are all laid on a bed of crushed ice at the fishmonger.
(archaic) A pimp."Excellent well; you are a fishmonger." - William Shakespeare, said by Hamlet to Polonius. (Act 2, Scene 2)