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News 2326 views last update:9 Aug 2016

Effect of algae inclusion in salmon diets

The inclusion of two different algae products in salmon feed did not cause any major positive, nor negative, effect in Atlantic salmon growth and feed efficiency, Australian researcher found.

The study was published in PLOS One.

Previous studies have proven that the inclusion of small amounts (<10% of the diet) of algae in fish feed (aquafeed) resulted in positive effects in growth performance and feed utilisation efficiency. marine algae have also been shown to possess functional activities, helping in the mediation of lipid metabolism, and therefore are increasingly studied in human and animal nutrition.>

The aim of this study, performed by Deakin University in Australia, was to assess the potentials of two commercially available algae derived products (dry algae meal), Verdemin (derived from Ulva ohnoi) and Rosamin (derived from diatom Entomoneis spp.) for their possible inclusion into diet of Atlantic salmon (Salmo salar).

Fish performances, feed efficiency, lipid metabolism and final product quality were assessed to investigate the potential of the two algae products (in isolation at two inclusion levels, 2.5% and 5%, or in combination), in experimental diets specifically formulated with low fish meal and fish oil content.

The results indicate that inclusion of algae product Verdemin and Rosamin at level of 2.5 and 5.0% did not cause any major positive, nor negative, effect in Atlantic salmon growth and feed efficiency. An increase in the omega-3 long-chain polyunsaturated fatty acid (n-3 LC-PUFA) content in whole body of fish fed 5% Rosamin was observed.

Source: PLOS One

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