Brewery by-products (yeast and spent grain) as protein sources in rainbow trout (Oncorhynchus mykiss) feeds

A trial was conducted to analyze the effect of inclusion yeast and spent grain obtained from breweries in feeds for rainbow trout ( Oncorhynchus mykiss ), taking into account availability these by-products, produced large quantities Europe. The ingredients were assayed both dried hydrolyzed format compared with a commercial or yeast. According results, 20% 15% feed, formulated only fish meal, similar results growth among all groups, food conversion significantly lower control feeds, muscle composition fed feed showed protein digestibility 87%–89% without differences Hydrolysis had no effects on feeds. Protein grain. An rate not higher than is recommended. These industrial by-products can be good source reduce use plant-based increase sustainability sectors, brewery industry, aquaculture.