The aim of this study was to determine the effect of a dietary multi-species probiotic on growth, gut morphology and immune parameters in Senegalese sole (Solea senegalensis). Fish were fed with two experimental diets, a control diet and the same diet supplemented with the probiotic for 72 days. A sub-lethal bath challenge with Photobacterium damselae subsp. piscicida was performed after the growth trial. Intes...