Abstract
Summary Qualitative and quantitative studies were performed on Vibrio species from seawater and mussel samples at a hatchery in Valencia harbour, and from market mussels. Vibrio alginolyticus and V. harveyi were the most abundant species in all samples. Other species identified were V. pelagius, V. mediterranei, V. tubiashii, V. damsella, V. splendidus, V. fluvialis, V. parahaemolyticus, V. anguillarum, V. cholerae and Aeromonas spp . The abundance of V. harveyi and V. mediterranei was positively correlated with temperature whereas V. pelagius counts showed negative correlation with this parameter. The pathogenic species were recovered in very low numbers. A numerical taxonomic study was performed on several representative isolates. Separation between V. parahaemolyticus and V. alginolyticus was not possible at species level. Two phena were phenotypically different from any described Vibrio species.
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