Abstract
High levels of mortality were observed among sea bass ( Dicentrarchus labrax) in a stocking tank at a pilot plant on the Mediterranean Coast. Fish were held in a greenhouse with an open water system. The temperature of the water was 24°C. Pure cultures of a motile rod, Gram- and cytochrome-oxidase negative bacterium were isolated. Additional biochemical tests identified these isolates as being similar to Edwardsiella ictaluri. Experimental infection was induced by intracoelomic injection, at a water temperature of 24°C. The E. ictaluri-like strain was recovered from kidneys of dead fish and identified biochemically. An LD50 test performed at 25°C induced infection by intracoelomic injection. The LD50 was 1.42×10 8 CFU/fish. Edwardsiella ictaluri outbreaks in sea bass have not previously been described elsewhere. The significance of the occurrence of E. ictaluri-like infections in sea bass cultures is discussed.
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