Probiotics in fish farming. Evaluation of a bacterial mixture

additif aux aliments des animaux aditivos de piensos aeromonas salmonicida alimentation des poissons animal growth promoters bacteria disease resistance enfermedades de los peces feed additives fish culture fish diseases fish feeding flora microbiana flore microbienne furonculose furunculosis growth rate maladie des poissons microbial flora mortalidad mortalite mortality oncorhynchus mykiss piscicultura pisciculture probiotics probiotique promoteur de croissance animale promotores del crecimiento animal resistencia a la enfermedad salvelinus alpinus supervivencia survie survival taux de croissance