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A bath challenge model for furunculosis in rainbow trout salmo gairdneri richardson and atlantic salmon salmo salar l



A bath challenge model for furunculosis in rainbow trout salmo gairdneri richardson and atlantic salmon salmo salar l



Journal of Fish Diseases 10(6): 495-504



A natural bath challenge method has been developed for furunculosis using Atlantic salmon, Salmo salar L., and rainbow trout, Salmo gairdneri Richardson. Fish were placed in an enclosed, continuously circulating tank system, supplemented with additional oxygen, the temperature raised gradually (overnight) to 15-16.degree. C, a low dose of Aeromonas salmonicida (strain 184/186) introduced into the tank and the challenge maintained for 14 days. The challenge strain was characterized with respect to possible virulence factors and possessed an A-layer, ability to auto-agglutinate, haemagglutinate, adhere to Atlantic salmon cells and resist destruction by serum. No caseinase acivity was detected. LD50 for salmon using this method was 1.8 .times. 103 cells per millilitre while trout had an LD50 of 9.5 .times. 104 cells per millilitre. Onset of the disease appeared to depend on fish size with larger trout (50 g) taking up to 10 days to show signs of the disease while mortalities in smaller trout (8.5 g) commenced on day 1 post-challenge.

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Accession: 004547713

Download citation: RISBibTeXText

DOI: 10.1111/j.1365-2761.1987.tb01101.x



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