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Increased systemic vascular resistance in Atlantic salmon, Salmo salar L., affected with amoebic gill disease


Leef, MJ and Hill, JV and Harris, J and Powell, MD, Increased systemic vascular resistance in Atlantic salmon, Salmo salar L., affected with amoebic gill disease, Journal of Fish Diseases, 30, (10) pp. 601-613. ISSN 0140-7775 (2007) [Refereed Article]

DOI: doi:10.1111/j.1365-2761.2007.00840.x


Previous investigations into the pathophysiology of amoebic gill disease (AGD) have suggested that there are probable cardiovascular effects associated with this disease. In the present study Atlantic salmon, Salmo salar L., were experimentally infected by cohabitation with diseased individuals. Two commonly used vasodilators, sodium nitroprusside (SNP) and captopril, the angiotensin-converting enzyme (ACE) inhibitor, were used as tools to investigate possible vasoconstriction and/or renin-angiotensin system (RAS) dysfunction in AGD-affected animals. Within the SNP trial, results showed that AGD-affected fish exhibited lowered cardiac output (Q), lowered cardiac stroke volume (V S) and a significantly elevated systemic vascular resistance (R S) compared with non-affected naïve counterparts. These effects were totally abolished following SNP administration (40 μg kg -1), however significant cardiovascular effects associated with SNP were not observed. Within the captopril trial, where AGD-affected fish were more diseased compared with the SNP trial, a significant hypertension was observed in AGD-affected fish. Captopril administration (10 -4 mol L -1 at 1 mL kg -1) resulted in a significant drop in dorsal aortic pressure (P DA) for both AGD-affected and naïve control fish. In terms of peak individual responses, captopril administration effectively lowered P DA in both AGD-affected and naïve control groups equally. The drop in P DA following SNP administration however was significantly greater in AGD-affected fish potentially suggesting disease-related vasoconstriction. The lack of significant cardiovascular effects directly associated with both SNP and captopril administrations possibly relate to the 6 h recovery period following surgical procedures. However, while variable, these results do suggest that there are significant cardiovascular effects including vasoconstriction and hypertension associated with AGD. © 2007 The Authors.

Item Details

Item Type:Refereed Article
Research Division:Agricultural, Veterinary and Food Sciences
Research Group:Fisheries sciences
Research Field:Aquaculture
Objective Division:Animal Production and Animal Primary Products
Objective Group:Fisheries - aquaculture
Objective Field:Fisheries - aquaculture not elsewhere classified
UTAS Author:Leef, MJ (Dr Melanie Leef)
UTAS Author:Hill, JV (Dr Jonathon Hill)
UTAS Author:Harris, J (Dr James Harris)
UTAS Author:Powell, MD (Dr Mark Powell)
ID Code:50051
Year Published:2007
Web of Science® Times Cited:3
Deposited By:TAFI - Aquaculture
Deposited On:2007-08-01
Last Modified:2009-11-05

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