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During summer periods when water temperatures are high, Atlantic salmon Salmo salar are forced to halt their migration. This phenomenon was observed in our study in the River Allier in France. Between 200 and 1200 S. salar have come to spawn in the River Allier every year\udfor the last 2 decades, but the population has suffered a severe decline. In 2009, 30 individuals were radio tracked; of these, 11 died during the summer period, while the other 19 resumed their migration in the fall. This mortality level was higher amongst the S. salar that arrived towards the end of the migration period, i.e. those individuals that tended to spend the summer in the lower,\udwarmer stretch of the river. In view of the continuing rise in freshwater temperatures, measures\udare urgently needed to reduce the impact of increased temperatures on fish in the River Allier.\udThis could be achieved by (1) promoting summer delays further upstream by making it easier for\udfish to pass through dams and (2) by protecting the spawning adults, particularly in the locations\udof summer halt. This study is consistent with a growing body of literature that suggests that climate\udchange could have devastating effects on the upstream migration phase of anadromous salmonids

Migration delays and mortality of adult Atlantic salmon Salmo salar en route to spawning grounds on the River Allier, France