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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

Artikel i vetenskaplig tidskrift
Författare A. Vidakovic
D. Huyben
Henrik Sundh
A. Nyman
J. Vielma
V. Passoth
A. Kiessling
T. Lundh
Publicerad i Aquaculture Nutrition
ISSN 1353-5773
Publiceringsår 2019
Publicerad vid Institutionen för biologi och miljövetenskap
Språk en
Länkar dx.doi.org/10.1111/anu.12988
Ämnesord 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
Ämneskategorier Marin ekologi

Sammanfattning

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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