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Resume The proportion of vibrio E, dominant in healthy turbot larvae, was artificially increased in the rotifer enrichment medium. The main effect of this vibrio enrichment was to improve the resistance of larval turbot challcngcd with a pathogenic strain of Vibrio sp1endidu.s. vibrio P. The improvement of the sumival rates was significant with 1.5 x 10' CFU of vibrio E added per ml of enrichment medium, and it was still maximum at the highest dose tested (5 x lu7 CFU.~~.'; 80 I 2% of survivors after 48 h of challenge, versus 50 I 2 '36 for the control group). Further in vitro characterisation showcd that vibrio E was able to grow in the presence of the chelating agents EDDHA and EDTA, while producing siderophore, as revealed by chrome azurol S dyeing. The pathogenic vibrio P did not grow on iron-depleted medium, and it did not seem to produce siderophore. Consequently, a second expcriment attempted to appraise the role of iron availability in the interaction between the pathogenic and probiotic vibrios. To this end, turbot larvae were fed with rotifers treated by the bacterial siderophore deferoxamine. This trcatment significantly increased the resistance of larvae challenged with vibrio P in comparison with the control group, but tu a Iesser extent than the group enriched with vibrio E. There was also an increase of the growth rate due to either the siderophore treatment or the vibrio enrichment, as well. No further improvement was observed when the rotifers were simultaneously both treated and enriched. It was concluded that the probiotic effect of vibrio E may be at least partly due to competition for iron with the pathogen.

Siderophore production and probiotic effect ofVibriosp. associated with turbot larvae,Scophthalmus maximus