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Fish larvae in aquaculture have high mortality rates due to pathogenic bacteria, especially the  Vibrio  species, and ineffective prophylactic strategies. Vaccination is not feasible in larvae and antibiotics have reduced efficacy against multidrug resistant bacteria. A novel approach to controlling  Vibrio  infections in aquaculture is needed. The potential of phage therapy to combat vibriosis in fish larvae production has not yet been examined. We describe the isolation and characterization of two bacteriophages capable of infecting pathogenic  Vibrio  and their application to prevent bacterial infection in fish larvae. Two groups of zebrafish larvae were infected with  V. anguillarum  (∼10 6  CFU mL −1 ) and one was later treated with a phage lysate (∼10 8  PFU mL −1 ). A third group was only added with phages. A fourth group received neither bacteria nor phages (fish control). Larvae mortality, after 72 h, in the infected and treated group was similar to normal levels and significantly lower than that of the infected but not treated group, indicating that phage treatment was effective. Thus, directly supplying phages to the culture water could be an effective and inexpensive approach toward reducing the negative impact of vibriosis in larviculture.

Phage Therapy as an Approach to Prevent Vibrio anguillarum Infections in Fish Larvae Production