The Inland Fisheries Board in Ireland recorded water temperatures of 220C in the water exiting the Lough Corrib catchment and heading for the sea over the Galway Salmon Weir today (5th July 2018). They subsequently issued a warning to anglers and asked them to voluntarily stop angling on rivers classified as "catch and release" for salmon throughout the country.
These high water temperatures (>200C) virtually incapacitate and take the "fight" out of what are usually cold-water fish.
These pictures were taken two days ago before the request was issued although the stretch of water between the weir and the sea is considered an "open" fishery and normally bag catches of 1-3 salmon are allowed. Flies and not bait hooks or spinners must be used in low water conditions.
Modern Map overlaid by 1888 OS map.