Pathogenicity of Vibrio harveyi to salmonids

X. H. Zhang, B. Austin

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    185 Citations (Scopus)


    Out of 19 Vibrio harveyi isolates obtained from a diversity of hosts and geographical locations, 14 were pathogenic to rainbow trout, Oncorhynchus mykiss (Walbaum), and Atlantic salmon, Salmo salar L., with mortalities of up to 100% following intraperitoneal injections of 106 cells fish-1. The extracellular products (ECPs) of only five pathogenic isolates were harmful to fish. Both pathogenic and non-pathogenic cultures produced ECPs containing caseinase, gelatinase, phospholipase, lipase and haemolysins. Vibrio harveyi VIB 645, which was the most pathogenic isolate, produced ECPs with a maximal effect on salmonids from preparations obtained by using cellophane overlays on tryptone soya agar supplemented with 1% (w/v) sodium chloride with incubation at 28 °C for 24 h. This preparation contained the highest titre of haemolytic activity to Atlantic salmon (1:256) and rainbow trout (1:32) erythrocytes.

    Original languageEnglish
    Pages (from-to)93-102
    Number of pages10
    JournalJournal of Fish Diseases
    Issue number2
    Publication statusPublished - 2000


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