Between the late 1950s and mid 1980s, pink salmon (Oncorhynchus gorbuscha) were introduced to the White Sea, from their native north Pacific rim, by Russian fisheries scientists. The new population expanded slowly at first, but eventually established a thriving ‘odd-year’ breeding cycle.
In 2017 – 2019, this population started expanding very rapidly in the north Atlantic, and pink salmon are now appearing in alternating years in UK rivers. 2023 is the latest of these years: a few days ago on 29 June, the Atlantic Salmon Trust’s Chris Conroy captured some excellent footage from the River Laxford, which you can view HERE.