Polz Lab
Microbial Ecology and Evolution
R.M. Parsons Laboratory
Environmental Science and Engineering

Javier Dubert-Perez

Postdoctoral Fellow


B.Sc. in Biology. University of Santiago de Compostela, Spain. 2008.

M.Sc. in Microbiology and Parasitology. University of Santiago de Compostela, Spain. 2010.

PhD in Microbiology. University of Santiago de Compostela, Spain. 2015.


Research summary

Microbiological aspects play an important role in aquaculture, particularly in artificial ecosystems like shellfish hatcheries. In these facilities, episodes of mortality (vibriosis) caused by some pathogenic species of genus Vibrio constitute the main bottleneck in the production process during the early stages of development. During my PhD, we have analyzed the Vibrio populations associated to the different compartments of the hatchery and their relationship with the success/failure of the cultures. Results demonstrated the close relationship between vibrios and the hatchery environment, then, vibrios flow among the different hatchery compartments is inevitable. In addition, three new pathogenic Vibrio spp. were identified. We have also contributed to advance in the elucidation of the pathogenesis of vibriosis following the infection process in bivalve larvae through GFP-tagged pathogenic species. We have also demonstrated the unsuitable use of chloramphenicol since promoted the rapid appearance of resistant vibrios by means of R-plasmids and was not effective to prevent the vibriosis. We have designed different protocols to reduce the Vibrioconcentration and improve the hatchery management from microbiological point of view. During this period, I gained experience in diagnosis, genomic and molecular biology and host-pathogen interactions.

Recently, I´m focusing in diverse topics like phages therapy against pathogenic vibrios or the study of natural competence in environmental vibrios. Regarding to natural competence, I´m trying to identify genes and regulatory connections to reveal how common natural competence is among diverse Vibrio isolates and other Vibrio species and to demonstrate their natural transformation.



Dubert J, Aranda-Burgos JA, Ojea J, Barja JL, Prado S. 2017. Mortality event involving larvae of the carpet shell clam Ruditapes decussatus in a hatchery: isolation of the pathogen Vibrio tubiashii subsp. europaeus. Journal of Fish Diseases, doi: 10.1111/jfd.12593

Dubert J, Balboa S, Regueira M, González–Castillo A, Gomez-Gil B, Romalde JL. 2016. Vibrio barjaei sp. nov., a new species of the Mediterranei clade isolated in a shellfish hatchery. Systematic and Applied Microbiology, 39: 553-556. doi: 10.1016/j.syapm.2016.09.001

Dubert J, Osorio CR, Prado S, Barja JL. 2016. Persistence of antibiotic resistant Vibrio spp. in shellfish hatchery environment. Microbial Ecology, 72:851-860. doi: 10.1007/s00248-015-0705-5

González-Castillo A, Enciso-Ibarra J, Dubert J, Romalde JL, Gomez-Gil B. Vibrio sonorensis sp. nov. isolated from a cultured oyster Crassostrea gigas. Antonie van Leeuwenhoek, 109:1447-1455. doi: 10.1007/s10482-016-0744-z

Dubert J, Romalde JL, Spinard EJ, Nelson DR, Gomez-Chiarri M, Barja JL. 2016. Reclassification of the larval pathogen for marine bivalves Vibrio tubiashii subsp. europaeus as Vibrio europaeus sp. nov. International Journal of Systematic and Evolutionary Microbiology, 66:4791 - 4796. doi: 10.1099/ijsem.0.001431

Spinard EJ, Dubert J, Nelson DR, Gomez-Chiarri M, Barja JL. 2016. Draft Genome sequence of the emerging bivalve pathogen Vibrio tubiashii subsp. europaeus. Genome Announcements, doi: doi:10.1128/genomeA.00625-16

Dubert J, Spinard EJ, Nelson DR, Gomez-Chiarri M, Romalde JL, Barja J. 2016. Draft genome sequence of the new pathogen for bivalve larvae, Vibrio bivalvicida. Genome Announcements, doi: 10.1128/genomeA.00216-16

Dubert J, da Costa F, Aranda-Burgos JA, Martínez-Patiño D, Prado S, Barja JL. 2016. Beneficial effects of carpet shell clam (Ruditapes decussatus) depuration during short periods of conditioning in shellfish hatchery: role of the temperature and phytoplankton on reduction and diversity of vibrios. Aquaculture, 459: 65-72. doi: 10.1016/j.aquaculture.2016.03.030

Deering R, Chen J, Sun J, Ma H, Dubert J, Barja JL, Seeram N, Wang H, Rowley D. 2016. N-Acyl Dehydrotyrosines, tyrosinase inhibitors from the marine bacterium Thalassotalea sp. PP2-459. Journal of Natural Products, 79: 447-450. doi: 10.1021/acs.jnatprod.5b00972

Dubert J, Romalde JL, Prado S, Barja JL. 2016. Vibrio bivalvicida sp. nov., a novel larval pathogen for bivalve molluscs reared in a hatchery. Systematic and Applied Microbiology, 39: 8-13. doi: 10.1016/j.syapm.2015.10.006

Dubert J, Nelson DR, Spinard EJ, Kessner L, Gomez-Chiarri M, da Costa F, Prado S, Barja JL. 2015. Following the infection process of vibriosis in Manila clam (Ruditapes philippinarum) larvae through GFP-tagged pathogenic Vibrio species. Journal of Invertebrate Pathology, 133: 27-33. doi: 10.1016/j.jip.2015.11.008

Dubert J, Fernández-Pardo A, Novoa S, Barja JL, Prado S. 2015. Phytoplankton production systems in a shellfish hatchery: variations of the bacterial load and diversity of vibrios. Journal of Applied Microbiology, 118: 1264-1275. doi: 10.1111/jam.12787

Prado S, Dubert J, Barja JL. 2015. Characterization of pathogenic vibrios isolated from bivalve hatcheries in Galicia, NW Atlantic coast of Spain. Description of Vibrio tubiashii subsp. europaensis subsp. nov. Systematic and Applied Microbiology, 38: 26-29. Elsevier, 02/2015. ISSN 0723-2020 doi: 10.1016/j.syapm.2014.11.005

Prado S, Dubert J, Romalde JL, Toranzo AE, Barja JL. 2014. Vibrio ostreicida sp. nov., a new pathogen of bivalve larvae. International Journal of Systematic and Evolutionary Microbiology, 64: 1641-1646. doi: 10.1016/j.syapm.2015.10.006

Prado S, Dubert J, da Costa F, Martínez-Patiño D, Barja JL 2014. Vibrios in hatchery cultures of the razor clam, Solen marginatus(Pulteney). Journal of Fish Diseases, 37: 209-217.doi: 10.1111/jfd.12098

Torres M, Romero M, Prado S, Dubert J, Tahrioui A, Otero A, Llamas I. 2013. N-acylhomoserine lactone-degrading bacteria isolated from hatchery bivalve larval cultures. Microbiological Research, 168: 547-554. doi: 10.1016/j.micres.2013.04.011


Book chapters:

Barja JL, Dubert J, Montes J, Olveira JG, Prado S, Martínez-Patiño D. 2016. Microbiological approaches to understand the threats for the wedge-shell clam (Donax trunculus) in natural beds. In: Oysters and clams: cultivation, habitat threats and ecological impact Nova Science Publishers, Nueva York, United States. ISBN 978-1-63485-074-2

Prado S, Dubert J, Barja JL. 2013. Studies on the microbiota associated with clams in Hatcheries, p 191–216. In: da Costa F (Ed), Clam fisheries and aquaculture. Nova Science Publishers, Nueva York, United States. ISBN 978–1–62257–518–3.

Prado S, Dubert J, Romalde JL, Barja JL. 2011. Advances in our knowledge of microbiota of hatchery-cultured Solenidae, p 169–179. In: Guerra A, Lodeiros C, Baptista M, da Costa F. (Eds), Razor clams: biology, aquaculture and fisheries. Xunta de Galicia, Consellería do Mar, Santiago de Compostela. Spain. ISBN: 978–84–453–4986–1.