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Clinical assessment of chloramine-T and freshwater as treatments for the control of gill amoebae in Atlantic salmon, Salmo salar L

Citation

Harris, J and Powell, MD and Attard, M and DeHayr, L, Clinical assessment of chloramine-T and freshwater as treatments for the control of gill amoebae in Atlantic salmon, Salmo salar L, Aquaculture Research, 36, (8) pp. 776-784. ISSN 1355-557X (2005) [Refereed Article]

DOI: doi:10.1111/j.1365-2109.2005.01286.x

Abstract

Infections of gill amoebae that manifest as amoebic gill disease (AGD) occur in Atlantic salmon in Tasmania. The treatment of choice is freshwater bathing; however, the effectiveness of this treatment has declined over time. In this experiment, cage trials of chloramine-T (Cl-T) to treat AGD in Atlantic salmon were conducted over 3 months, and involved an initial bath in either freshwater or seawater with Cl-T, followed by a second bath 6 weeks later. Amoeba densities were reduced to 50-80% of original values for both treatments. Neoparamoeba sp. density was not affected by bathing, and was not significantly different over the course of the experiment. Lesion prevalence was higher for Cl-T-treated fish than for freshwater-treated fish, with overall prevalence levels of 14.30 ± 1.00% and 8.03 ± 0.57% respectively. This was also seen for gross gill scores. In the fortnight after each of the two baths, Cl-T-treated fish had significantly higher lesion levels, although this difference was then resolved by 4 weeks post bathing. The use of Cl-T in seawater is at least as effective as freshwater at reducing amoebae density, and may be a more practical alternative when freshwater is in short supply. © 2005 Blackwell Publishing Ltd.

Item Details

Item Type:Refereed Article
Research Division:Agricultural and Veterinary 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
Author:Harris, J (Dr James Harris)
Author:Powell, MD (Dr Mark Powell)
Author:Attard, M (Mr Michael Attard)
ID Code:33303
Year Published:2005
Web of Science® Times Cited:12
Deposited By:TAFI - Aquaculture
Deposited On:2005-08-01
Last Modified:2006-04-01
Downloads:0

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