Nutritional aspects of haemorrhagic syndrome ("Hitra disease") in farmed Atlantic salmon Salmo salar

Haemorrhagic Syndrome (HS) or "Hitra Disease" currently constitutes the most important disease problem in Norwegian salmonid farming. Histopathological and chemical findings strongly support the hypothesis of HS being a multifactorial disease complex in which nutritional and/or metabolic disorders are important components. The resemblance to vitamin E/selenium deficiency syndromes in other domesticated animals is discussed.