Aetiological Agents Of Vibriosis Vibrio anguillarum The bacterium

Vibrio anguillarum is a polarly flagellated, Gram-negative, curved rod (Fig. 14.1). It is a facultative anaerobe, with a guanine plus cytosine (G + C) content of 43-46%. It grows rapidly at 25-30°C in rich media, such as brain-heart, trypticase soy broth or agar containing 1.5% sodium chloride (NaCl). On solid medium, it produces circular, cream-coloured colonies. Vibrio anguillarum belongs to one of the halophilic groups of vibrios and survives at different salinities. Hoff (1989) has shown that it is able to survive in sea water for more than 50 months. A list of the phenotypic properties, as well as the salt and temperature range for V. anguillarum, has been published (Schiewe et al., 1981). In the recent past, new names have been proposed for V. anguillarum, such

Vibrio Anguillarum
Fig. 14.1. Electron micrograph of V. anguillarum775 showing single polar flagellum. Shadowed preparation x 10,000. (Micrograph by Dr J.H. Crosa.)

as Beneckea anguillara biotype 1 (Baumann et al, 1978) or ListoneJJa anguillarum (McDowell and Colwell, 1985). For historical and practical reasons and because of its close relationship to other marine vibrios (Crosa, 1989; Tolmasky et al., 1994; Wertheimer et al., 1994), we shall continue to use the original nomenclature, i.e. V. anguillarum, for this important fish pathogen.

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