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Streptococcus iniae, a bacterial infection in barramundi Lates calcarifer

Bromage, E.S. and Thomas, A. and Owens, L. (1999) Streptococcus iniae, a bacterial infection in barramundi Lates calcarifer. Diseases of Aquatic Organisms, 36 (3). pp. 177-181.

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Publisher URL: http://www.int-res.com

Abstract

The cause of ongoing mortality in barramundi Lates calcarifer (Bloch) in seawater culture was identified as Streptococcus iniae by biochemical and physiological tests. This is the first published record of this bacterial species in Australia and the first confirmed report of S. iniae causing mortality in barramundi. The bacterium was highly pathogenic for barramundi when challenged by bath exposure. The pathogen was found to have a LD sub(50) of 2.5 x 10 super(5) and 3.2 x 10 super(4) colony-forming units at 48 h and 10 d respectively. Experimental challenge of barramundi resulted in high levels of mortality (>40%) within a 48 h period. Ten days after the challenge, S. iniae could not be isolated from kidney, spleen, liver or eye of surviving fish. However, the organism was easily isolated from the brain of both moribund and healthy fish, indicating that barramundi can carry the bacterium asymptomatically.

Item Type:Article
Corporate Creators:Department of Employment, Economic Development and Innovation (DEEDI), Agri-Science, Crop and Food Science
Business groups:Agri-Science, Crop and Food Science
Additional Information:© Inter-Research.
Keywords:Fish culture; Pathogenic bacteria; Disease detection; Mortality; Aquaculture; Australia; Streptococcus iniae; Lates calcarifer; PSE, Australia; ISEW, Australia
Subjects:Aquaculture and Fisheries > Aquaculture > Fish culture > Diseases and adverse factors
Deposited On:22 Jun 2004
Last Modified:27 Oct 2011 01:54

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