Apparent digestibility coefficients of brewer's by-products used in feeds for rainbow trout (Oncorhynchus mykiss) and gilthead seabream (Sparus aurata)
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San Martin, D.
A trial was conducted to test the effect of partial replacement of fishmeal by two brewery industry byproducts, yeast and spent grain, included in isoproteic (41% CP) and isolipidic (22% CL) diets for gilthead sea bream (Sparus aurata) and rainbow trout (Oncorhyncus mykiss), having in mind the availability of these byproducts. A first step before an ingredient is included in a commercial feed is to evaluate the nutritional quality of these raw materials by measuring their digestibility. Thus, the apparent digestibility coefficients of the diets and ingredients were determined after a 30 days feeding trial and faecal collection. Apparent digestibility coefficients of these by products in the case of rainbow trout varied between 75 and 88% whereas for gilthead seabream was between 71 and 88%. According to the results obtained, the inclusion of 20–30% of brewers' spent yeast and spent grain in the feed for carnivorous fish either from fresh (rainbow trout) or marine (gilthead seabream) gave similar results to a feed with fish meal as the main protein source and show a good protein, lipid and amino acid digestibility. Taking into account that these by-products are produced in large quantities in Europe, they can be a potential source of protein to reduce the use of plant proteins or fish/animal byproducts (trimmings) and increase the sustainability of both sectors, brewery industry and aquaculture.
639 - Caça. Pesca. Piscicultura
Is part of
Nazzaro, J., D. San Martin, A.M. Perez-Vendrell, L. Padrell, B. Iñarra, M. Orive, and A. Estévez. 2021. "Apparent Digestibility Coefficients Of Brewer's By-Products Used In Feeds For Rainbow Trout (Oncorhynchus Mykiss) And Gilthead Seabream (Sparus Aurata)". Aquaculture 530: 735796. doi:10.1016/j.aquaculture.2020.735796.
Grant agreement number
EC/LIFE/LIFE 16 ENV-ES-000160/EU/New strategies for improving the sustainability of breweries: full waste recovery for Aquaculture feed/LIFE Brewery
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