The effect of Pediococcus acidilactici on the gut microbiota and immune status of on-growing red tilapia (Oreochromis niloticus).

Abstract:

AIM:To assess Pediococcus acidilactici as a dietary supplement for on-growing red tilapia (Oreochromis niloticus). METHODS AND RESULTS:Tilapia were fed either a control diet or control diet supplemented with Ped. acidilactici at 10(7) CFU g(-1) for 32 days. Ped. acidilactici colonized the intestinal tract and significantly affected the intestinal microbial communities. PCR-DGGE revealed direct antagonism of gastric Ped. acidilactici with an endogenous uncultured bacterium during a period of reverting to nonsupplemented feeding. Light microscopy revealed that gut integrity and leucocyte levels were unaffected by Ped. acidilactici; however, blood leucocyte levels and serum lysozyme activity were elevated after 14-days' feeding. No significant improvements in growth performance were observed at the end of the trial (day 32), but survival was significantly higher in the probiotic group. CONCLUSIONS:  The study demonstrates that oral supplementation of Ped. acidilactici modulates intestinal bacterial communities in on-growing red tilapia and also stimulates some aspects of the nonspecific immune response. SIGNIFICANCE AND IMPACT OF THE STUDY:  To our knowledge this is the first study assessing the effects of probiotics on the gut microbiota of tilapia using culture-independent methods. Such methods are crucial to understand the mechanisms which underpin and mediate host benefits.

journal_name

J Appl Microbiol

authors

Ferguson RM,Merrifield DL,Harper GM,Rawling MD,Mustafa S,Picchietti S,Balcázar JL,Davies SJ

doi

10.1111/j.1365-2672.2010.04713.x

subject

Has Abstract

pub_date

2010-09-01 00:00:00

pages

851-62

issue

3

eissn

1364-5072

issn

1365-2672

pii

JAM4713

journal_volume

109

pub_type

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