The Salmon: The Extraordinary Story of the King of Fish. Michael Wigan

a salmon and grilse catch averaging 109,000 fish between 1811 and 1815, which had shrunk to a third of that in the early 1850s. That contraction had itself halved by the end of the century. Pollution, poaching, over-fishing and industrialisation began to hammer stocks of a fish which above all needed unadulterated water and a clear passage.

      Brittany has a rocky coastline but French historians of the eighteenth century reckon that as many as 4,500 tons of salmon were landed in good years. Using an average weight of ten pounds per fish, this equates to roughly one million salmon. The 1789 revolution ended this happy state of affairs when landed assets, including fishing rights, were distributed amongst the population without safeguards for maintaining the harvest. Fishing was allowed above the navigable reaches of rivers and the waters were ransacked. Prior to that, sense had prevailed: mills were obliged in law to open their gates by night and on Sundays, and if salmon were held up in their passage to the redds in the headwaters, it was never for long.