Nutritional composition of rotifers following a change in diet from yeast and emulsified oil to microalgae |
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| Authors: | Oyvind Lie Herborg Haaland Gro-Ingunn Hemre Amund Maage Einar Lied Grethe Rosenlund Kjartan Sandnes Yngvar Olsen |
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| Institution: | (1) Institute of Nutrition, Directorate of Fisheries, PO Box 185, Bergen, Norway;(2) SINTEF Applied Chemistry Center of Aquaculture, Trondheim, Norway;(3) Aquaculture Research Centre, Nutreco, PO Box 353, Forus, Norway |
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| Abstract: | Rotifers, Brachionus plicatilis, fed baker's yeast and a lipid emulsion (High DNA Super Selco, INVE Aquaculture NV Systems SA, Belgium), were harvested and fed Isochrysis galbana for 72 h, the nutrient composition was analysed during this period. The enrichment effect on the rotifers following transfer to I. galbana was most pronounced for ascorbic acid and thiamin. I. galbana seemed to contribute very little as a source of the lipid-soluble vitamins. Most of the minerals and trace elements were unaffected by the transfer to I. galbana, but Fe, Mn, As and Cd increased, Cu and Ni decreased whereas the effect on Cr and Mo were uncertain. The fatty acid composition of the rotifers changed towards the composition of I. galbana during the experimental period. Intermediate glycogen levels were measured in the rotifers at all sampling times. With the exception of lysine, serine and proline, all amino acid levels seemed to be unaffected by the transfer to I. galbana. This study showed that transfer of rotifers to microalgae (I. galbana) feeding had a positive effect on nutritional value. Macronutrients were maintained at adequate levels, and algal feeding improved the nutritional quality of rotifers with respect to water-soluble vitamins. Changes in rotifer nutrient composition are discussed in relation to nutritional requirements of fish larvae. |
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| Keywords: | Algae (Isochrysis galbana) enrichment Nutrient composition Rotifer (Brachionus plicatilis) |
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