Ascorbyl palmitate as a dietary vitamin C source for rainbow trout (Salmo gairdneri)
1988; Elsevier BV; Volume: 71; Issue: 4 Linguagem: Inglês
10.1016/0044-8486(88)90205-0
ISSN1873-5622
AutoresSissel Albrektsen, Øyvind Lie, Kjartan Sandnes,
Tópico(s)Reproductive biology and impacts on aquatic species
ResumoThe vitamin C activity of ascorbyl palmitate was investigated for use in salmonid diets. Three groups of “swim up” rainbow trout (Salmo gairdneri) fry were fed identical basal diets for 12 weeks supplemented with no form of ascorbic acid (group A), 600 mg ascorbic acid/kg (group B) and ascorbyl palmitate in equimolar amounts to the group B supplement (group C). The fish in group C showed reduced growth for the first 8 weeks. From week 8 onwards growth rate in group C paralleled that in group B, while the fish fed the diet devoid of any form of vitamin C (group A) showed a reduced growth rate. The concentrations of ascorbic acid at the end of the experiment were < 0.5, 64 and 55 μg/g in whole fish and < 0.5, 156 and 118 μg/g in the liver for groups A, B and C, respectively. Vertebral collagen in fish fed ascorbyl palmitate contained similar levels of hydroxyproline to that in fish fed ascorbic acid as vitamin source. An in vitro assay demonstrated the presence in the rainbow trout gut of enzymatic activity hydrolyzing the ascorbyl palmitate.
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