In conclusion, the dietary administration of LPS from P. agglomerans at 20 μgkgBW−1day−1
in rainbow trout fry resulted in an improvement of growth performance in terms of BW and SL; a more homogeneous fish size distribution and better condition factor of animals, as well as a more efficient use of the diet. In addition, the dietary administration of LPSp enhanced the density of intestinal goblet cells and increases the level of leukocytes in the intestinal mucosa suggesting an enhancement of the intestinal innate immune function. These results were supported by the enhancement of the blood non-specific immune function observed in fish fed LPSp-containing diets. These results may be of practical significance for fish farmers, since the inclusion of LPS from P. agglomerans in fish diets might not only prevent disease in aquaculture systems (Kohchi et al., 2006), but also improve their growth performance and efficiency of the rearing process.
Acknowledgments