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Histopathological and haematological changes in amago salmon, Oncorhynchus rhodurus (Jordan & McGregor), fed a vitamin‐D‐free diet
Author(s) -
Taveekijakarn P,
Miyazaki T,
Matsumoto M,
Aral S
Publication year - 1996
Publication title -
journal of fish diseases
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.819
H-Index - 85
eISSN - 1365-2761
pISSN - 0140-7775
DOI - 10.1046/j.1365-2761.1996.d01-85.x
Subject(s) - biology , endocrinology , medicine , vitamin , epidermis (zoology) , hypocalcaemia , pathological , oncorhynchus , anatomy , necrosis , fish <actinopterygii> , calcium , genetics , fishery
Two purified diets supplemented with 0 or 20 000 IU vitamin D 3 kg −1 of diet were fed to amago salmon, Oncorhynchus rhodurus (Jordan & McGregor), for 22 weeks. The feeding stopped when fish with deficiency signs including reduced growth, and caudal region and fin tip damage increased in number. Deficient fish had a thinned epidermis consisting of atrophied and necrotic epidermal cells over the basal cells. In lesions of the caudal peduncle, the skin and the underlying musculature were extensively necrotized. The liver showed degenerated and necrotic hepatocytes. Respiratory epithelium and cardiac muscle fibres were swollen. Hypocalcaemia was evident. No pathological changes were found in bone, eyes, brain and alimentary tract. The control groups fed a nutritionally complete diet grew well and displayed no pathological changes. The pathological changes were reversed after 4 weeks of feeding of vitamin‐D 3 ‐suppliemented diet.