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Experimentally induced marine flexibacteriosis in Atlantic salmon smolts Salmo salar. II. Pathology


van Gelderen, R and Carson, J and Nowak, B, Experimentally induced marine flexibacteriosis in Atlantic salmon smolts Salmo salar. II. Pathology, Diseases of Aquatic Organisms, 95, (2) pp. 125-135. ISSN 0177-5103 (2011) [Refereed Article]

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Copyright 2011 Inter-Research

DOI: doi:10.3354/dao02329


ABSTRACT: The fish disease marine flexibacteriosis is characterised by necrotic lesions on the body, head, fins, and occasionally gills, with erosive lesions on the external surface as the prominent clinical sign. In Australia, the main species affected are Atlantic salmon Salmo salar and rainbow trout Oncorhynchus mykiss in sea-cage culture in Tasmania. Using a dose-dependent trial to determine pathology, 2 forms of the disease were noted in Atlantic salmon. The acute form occurs within 2 to 3 d after inoculation at high doses (1 108 cells ml1) and is characterised by the disintegration of the epithelium. The chronic form of the disease began as small superficial blisters of the epidermis, which develop into ulcerative lesions that leave musculature exposed. The predominant lesion sites were the dorsum and pectoral fins. Jaws were commonly affected, and gill necrosis was also noted. Behaviour of Atlantic salmon as well as the conditions under which they were kept contribute to the size and distribution of lesions observed. Lack of an inflammatory response in pathology and rapid and destructive mortalities observed in higher inoculum doses suggested a role of toxins in the pathogenesis of Tenacibaculum maritimum. This is the first study to examine the development of marine flexibacteriosis lesions and to utilise immunohistochemistry to verify that the bacteria observed in histology was T. maritimum.

Item Details

Item Type:Refereed Article
Research Division:Agricultural, Veterinary and Food Sciences
Research Group:Fisheries sciences
Research Field:Fish pests and diseases
Objective Division:Animal Production and Animal Primary Products
Objective Group:Fisheries - aquaculture
Objective Field:Aquaculture fin fish (excl. tuna)
UTAS Author:van Gelderen, R (Ms Rebecca van Gelderen)
UTAS Author:Nowak, B (Professor Barbara Nowak)
ID Code:71999
Year Published:2011
Web of Science® Times Cited:7
Deposited By:NC Marine Conservation and Resource Sustainability
Deposited On:2011-08-18
Last Modified:2017-07-26
Downloads:1 View Download Statistics

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