Solar ultraviolet radiation as a causal factor of ‘summer syndrome’ in cage‐reared Atlantic salmon, Salmo solar L.: a clinical and histopathological study

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Abstract
During the exceptionally good summer of 1984, severe losses occurred at a number of marine salmon farms in the west of Ireland. Clinical signs and associated histopathology of the disease are described together with relevant meteorological data gathered during the course of the mortalities. The clinical, histopathological and meteorological data observed strongly suggest that prolonged exposure to solar ultraviolet radiation played a major role in the losses which occurred. Other contributory factors involved in the mortalities are described and discussed.