Aims:The seasonal trend and frequency of detection of Vibrionaceae in seawater samples and in molluscs collected in the Adriatic Sea was measured. Methods and Results: Over a 2-year period, 726 bacterial strains were isolated, of which 46á9% belonged to the Vibrio genus, 29á8% to the Aeromonas genus and the remaining 23á3% was made up of the Pseudomonas, Flavobacterium, Pasteurella, Agrobacterium and Ochrobacterium genera. Many of the isolated strains were shown to produce toxins. Conclusions: The Vibrio genus, which was isolated more often than the other genera, was particularly prevalent in summer (54á4% of the total number of bacteria isolated during this season), while it was scarce in the winter months.

The Vibrio genus, which was isolated more often than the other genera, was particularly prevalent in summer (54.4% of the total number of bacteria isolated during this season), while it was scarce in the winter months.

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