| 
      Different superscripts represent  significant differences (P < 0.05)  observed between exposures within the feeding groups (i.e. within columns). T represents a trend  (P < 0.10) towards  difference between exposure groups within the same column. ** indicates a trend towards a difference (P < 0.10) between the control and probiotic  fed groups (i.e. between columns).
        |  | Control | Probiotic |  
        | PBS | 9.9 ± 2.8T** | 13.9 ± 3.1a** |  
        | V.    anguillarum | 8.0    ± 1.5 | 7.4 ± 1.9b |  
        | P.    acidilactici | 9.0    ± 1.6 | 10.4 ± 1.7c |  
        | V.    anguillarum+ P. acidilactici | 6.8 ± 2.9T | 6.8 ± 1.6b |  |