Dietary yeast culture supplementation improves initial rearing of McConaughy strain rainbow trout

Abstract

The addition of a yeast culture food supplement (DVAqua from Diamond V. Mills, Cedar Rapids, IA, USA) was evaluated during feeding of McConaughy strain rainbow trout Oncorhynchus mykiss. Two trials were run consecutively, starting with initial feeding, and were replicated over 2 years. The yeast culture was added to commercial trout starter at levels of 0.125 and 0.25 g kg−1. The number of rainbow trout that died during the first 4 weeks of rearing was significantly reduced in the tanks receiving either of the yeast culture‐supplemented diets compared with the tanks receiving a control starter diet. Ending tank weights and gain were significantly and consistently greater in the tanks fed the 0.25 g kg−1 yeast culture diet. Individual fish weights were also significantly heavier in the fish‐fed yeast culture containing diets in each year of the study at the end of 27 days. In the trials from 4 to 8 weeks postinitial feeding, mortality rates were significantly less only in the tanks receiving 0.25 g kg−1 yeast culture supplementation. Individual fish lengths and weights at the end of the second trial were significantly greater in the tanks receiving either level of yeast culture compared with the control diet only in 1 year. Total tank weights and feed conversion were not significantly different between any of the treatments. The inclusion of DVAqua yeast culture provided significant increases in trout survival and growth through the first 4 weeks of feeding, with continued benefits for the next 4 weeks.

Dietary Ergosan as a Supplemental Nutrient on Growth Performance, and Stress in Zebrafish (Danio Rerio)

“…In this study, all treatment groups presented higher growth indices (BWG, SGR, and CF) and lower FCR than the control group after a period of 90 days feeding. These findings are in agreement with the on rainbow trout that received fermented S. cerevisiae (Barnes et al 2006) and Ergosan (Gioacchini et al 2010). In this study, Ergosan enhanced growth indices and feed intake.…”

Nutritional yeast culture has specific anti-microbial properties without affecting healthy flora. Preliminary results

“…Yeast culture is a Saccharomyces cerevisiae based product that is used as a nutritional additive to animal feed (Schingoethe et al, 2004;Barnes et al, 2006). Data presented here show that XP yeast culture specifi cally inhibited growth of E. coli and C. tropicalis, with only a minor inhibition of growth of S. aureus or healthy oral fl ora.…”

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“…Phytase was added to the experimental diets at a level of 0.4 g/kg, about 2,000 FYT/kg, and it seems to be an adequate level to be included when 400 g/kg of soybean is used. Regarding the use of yeast, it has been reported previously as growth promoter in several species of fish such as Nile tilapia Oreochromis niloticus (LaraFlores et al, 2003;Adbel-Tawwab et al, 2008), grouper Epinephelus coioides (Chiu et al, 2010) and rainbow trout (Barnes et al, 2006). However, for the first time is reported its use in diets with high contents of soybean meal.…”

“…Recently (Cruz et al, 2011) it was report that juveniles of rainbow trout fed a diet with soybean meal (400 g/kg diet) as main source of protein and phytase (0.8 g/kg diet) had a similar growth performance and showed a reduction in P and N excretion, compared to those fed a commercial diet and one with fishmeal as sole protein source. On the other hand, the inclusion of yeast of genus Saccharomyces on feed improved the growth of several species of fish (Lara-Flores et al, 2003;Adbel-Tawwab et al, 2008;Chiu et al, 2010;Barnes et al, 2006), and despite the fact that Saccharomyces yeast are able to produce phytase when the phytic acid is present (Nayini and Markakis, 1984) so far there are not reports of its use on diets with high contents of soybean protein sources. Therefore, the aim of the present research was to determine the effects of the inclusion of yeast and/or phytase to a basal diet with 75% of soybean meal (400 g/kg diet) and 25% of fishmeal (200 g/kg diet) in the growth, P and N excretion, oxygen consumption and serum lysozyme activity of juvenile rainbow trout (Oncorhynchus mykiss) reared under laboratory and farm conditions.…”