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Growth performance, nutrient digestibility and intestinal morphology of rainbow trout (Oncorhynchus mykiss) fed graded levels of the yeasts Saccharomyces cerevisiae and Wickerhamomyces anomalus

Journal article
Authors A. Vidakovic
D. Huyben
Henrik Sundh
A. Nyman
J. Vielma
V. Passoth
A. Kiessling
T. Lundh
Published in Aquaculture Nutrition
ISSN 1353-5773
Publication year 2019
Published at SWEMARC
Department of Biological and Environmental Sciences
Language en
Links dx.doi.org/10.1111/anu.12988
Keywords alternative protein sources, feed formulation, intestinal health, nutrient bioavailability, salmonids, yeast, salmo-gairdneri richardson, fish-meal, nitrogen-utilization, atlantic, salmon, dried yeast, fed diets, phytase, accumulation, substitute, inclusion, Fisheries, lahiguera m, 1981, comparative biochemistry and physiology a-molecular & integrative physiology, v69, p583
Subject categories Marine ecology

Abstract

In a 10-week study, we evaluated the effects of replacing 20%, 40% or 60% of fishmeal (present in control diet at 300 g/kg) on a digestible protein basis with yeast Saccharomyces cerevisiae or a yeast mixture of Wickerhamomyces anomalus and S. cerevisiae on growth performance, nutrient digestibility, nutrient retention and intestinal health of rainbow trout (Oncorhynchus mykiss). Triplicate tanks with 35 rainbow trout (144.7 +/- 25.1 g mean +/- SEM) were fed rations of 1.5% of total biomass per tank. Replacement of 60% of fishmeal with yeast mixture resulted in lower specific growth rate of 1.0% versus 1.2%/day for other diets. Apparent digestibility coefficients for crude protein and most amino acids were highest in fish fed fishmeal-based diet, with similar values for fish fed the diet with 20% replacement with yeast mixture. Diet with 20% replacement with yeast mixture resulted in highest phosphorus digestibility. Replacement of 60% of fishmeal with S. cerevisiae resulted in oedematous mucosal fold tips in the proximal intestine. The results of this study suggest that these yeasts can replace up to 40% of fishmeal under current inclusion levels in diets for rainbow trout without compromising growth performance, nutrient digestibility or intestinal health.

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