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Vibrio neptunius sp. nov., Vibrio brasiliensis sp. nov. and Vibrio xuii sp. nov., isolated from the marine aquaculture environment (bivalves, fish, rotifers and shrimps)

¹ Laboratory for Microbiology, Ghent University, K. L. Ledeganckstraat 35, Ghent 9000, Belgium
² BCCM^TM/LMG Bacteria Collection, Ghent University, K. L. Ledeganckstraat 35, Ghent 9000, Belgium
³ College of Marine Life Sciences, Ocean University of Qingdao, 5 Yushan Road, Qingdao, 266003, China
⁴ CIAD/Mazatlán Unit for Aquaculture, AP. 711, Mazatlán, Sinaloa, Mexico 82000
⁵ Laboratory for Culture of Marine Molluscs, Federal University of Santa Catarina, Department of Aquaculture, Florianópolis, Brazil
⁶ Laboratory of Aquaculture and Artemia Reference Center, Ghent University, Rozier 44, Ghent 9000, Belgium

Correspondence
F. L. Thompson
Fabiano.Thompson{at}rug.ac.be

The fluorescent amplified fragment length polymorphism (FAFLP) groups A5 (21 isolates), A8 (6 isolates) and A23 (3 isolates) distinguished in an earlier paper (Thompson et al., Syst Appl Microbiol 24, 520–538, 2001) were examined in more depth. These three groups were phylogenetically related to Vibrio tubiashii, but DNA–DNA hybridization experiments proved that the three AFLP groups are in fact novel species. Chemotaxonomic and phenotypic analyses further revealed several differences among the 30 isolates and known Vibrio species. It is proposed to accommodate these isolates in three novel species, namely Vibrio neptunius (type strain LMG 20536^T; EMBL accession no. AJ316171; G+C content of the type strain 46·0 mol%), Vibrio brasiliensis (type strain LMG 20546^T; EMBL accession no. AJ316172; G+C content of the type strain 45·9 mol%) and Vibrio xuii (type strain LMG 21346^T; EMBL accession no. AJ316181; G+C content of the type strain 46·6 mol%). These species can be differentiated on the basis of phenotypic features, including fatty acid composition (particularly 14 : 0 iso, 14 : 0 iso 3-OH, 16 : 0 iso, 16 : 0, 17 : 0 and 17 : 18c), enzyme activities and utilization and fermentation of various carbon sources.

Published online ahead of print on 12 July 2002 as DOI 10.1099/ijs.0.02447-0.

The GenBank/EMBL/DDBJ accession numbers for the 16S rDNA sequences of LMG strains 20536^T, 20546^T, 21346^T, 20613, 20010 and 21347 are respectively AJ316171, AJ316172, AJ316181 and AJ490150–AJ490152.

Additional phenotypic features of the three novel species are listed as supplementary material in IJSEM Online (http://ijs.sgmjournals.org/).

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