Journal
MICROBIAL ECOLOGY
Volume 59, Issue 1, Pages 187-198Publisher
SPRINGER
DOI: 10.1007/s00248-009-9597-6
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Funding
- Texas Sea Grant College Program
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Two separate experiments were conducted with hybrid striped bass to evaluate four potential prebiotics: GroBioticA (R)-A (partially autolyzed brewer's yeast, dairy ingredient components, and fermentation products), mannanoligosaccharide (MOS), galactooligosaccharide (GOS), and inulin. In the in vitro experiment, intestinal contents were incubated with the individual prebiotics (0.5% by weight) at 25A degrees C for 24 and 48 h. Analysis of volatile fatty acids in the supernatant showed that GroBioticA (R)-A, MOS, and GOS tended to produce lower acetate levels but higher butyrate levels at 48 h compared to diet alone. However, denaturing gradient gel electrophoresis (DGGE) analysis failed to detect any differences in the composition of the microbial community among treatments. DNA sequencing of a common band for all inoculated samples revealed close similarity to the anaerobic Fusobacteria bacterium. An 8-week feeding trial also was conducted to evaluate the four prebiotics looking at growth performance; weight gain, feed efficiency ratio, protein efficiency ratio, whole-body ash, moisture, and lipid did not vary among fish fed the various diets. However, DGGE analysis revealed that all prebiotics produced a different type of microbial community in the intestinal tract of hybrid striped bass compared to fish fed the basal diet. Thus, GroBioticA (R)-A, FOS, GOS, and MOS exhibited prebiotic effects in hybrid striped bass.
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