Abstract
The rearing environment of first-feeding turbot larvae, usually with high larvae densities and organic matter concentrations, may promote the growth of opportunistic pathogenic Vibrionaceae bacteria, compromising the survival of the larvae. The aim of this study was to assess the effectiveness of the biofilm-forming probiotic Phaeobacter 27-4 strain grown on a ceramic biofilter (probiofilter) in preventing Vibrio anguillarum infections in turbot larvae. In seawater with added microalgae and maintained under turbot larvae rearing conditions, the probiofilter reduced the total Vibrionaceae count and the concentration of V. anguillarum, which was undetectable after 144 h by real-time PCR. The probiofilter also improved the survival of larvae challenged with V. anguillarum, showing an accumulated mortality similar to that of uninfected larvae (35–40 %) and significantly (p < 0.05) lower than that of infected larvae with no probiofilter (76 %) due to a decrease in the pathogen concentration and in total Vibrionaceae. Furthermore, the probiofilter improved seawater quality by decreasing turbidity. Phaeobacter 27-4 released from the probiofilters was able to survive in the seawater for at least 11 days. The bacterial diversity in the larvae, analysed by denaturing gradient gel electrophoresis, was low, as in the live prey (rotifers), and remained unchanged in the presence of V. anguillarum or the probiofilter; however, the probiofilter reduced the bacterial carrying capacity of the seawater in the tanks. Phaeobacter-grown biofilters can constantly inoculate probiotics into rearing tanks and are therefore potentially useful for bacterial control in both open and recirculating industrial units.
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Acknowledgments
We thank Professor Lone Gram for kindly providing the strains used in this study. We are grateful to Dr Miquel Planas for critical revision of the manuscript and to Alexandro Chamorro for technical assistance. We also thank Elisabeth Heseltine for editing the manuscript.
María J. Prol-García obtained a grant from the I3P Program of CSIC, co-financed by European Social Fund. Research funding was also provided by INIA (ACU03-003) and by the I3 Program of the Spanish Ministry of Education and Science (CSIC-PIE 2006 7 01067).
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Supplementary figure 1
PCR-DGGE profile of 16S rDNA fragments of A) turbot larvae from control, BPh, Va and VaBPh tanks; B) rotifer samples from tanks on day 10 post-hatching (rotifer LD10), of rotifers enriched with I. galbana (rotifers Ig) and of rotifers loaded with V. anguillarum (rotifers Va); and C) seawater samples taken from control, BPh, Va and VaBPh tanks. M: marker (A: Kordia algicida, B: Tenacibaculum discolor, C: Vibrio anguillarum 90-11-287, D: Phaeobacter 27-4, E: Ruegeria mobilis, F: Flexibacter sp). Va: band with a migration pattern similar to V. anguillarum, Ph: band with a migration pattern similar to Phaeobacter 27-4. (DOCX 6544 kb)
Supplementary figure 2
Functional organization based on Pareto–Lorenz distribution curves obtained from DGGE profiles on days 3 (×), 5 (◊), 7 (Δ), 9 (○) and 10 (□) after larval hatching of larvae and seawater from control, BPh, Va and VaBPh tanks. The dashed vertical line at the 0.2x axis is plotted to evaluate the range of the Pareto values. (DOCX 701 kb)
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Prol-García, M.J., Pintado, J. Effectiveness of Probiotic Phaeobacter Bacteria Grown in Biofilters Against Vibrio anguillarum Infections in the Rearing of Turbot (Psetta maxima) Larvae. Mar Biotechnol 15, 726–738 (2013). https://doi.org/10.1007/s10126-013-9521-4
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DOI: https://doi.org/10.1007/s10126-013-9521-4