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Effects of husbandry on prevalence of amoebic gill disease and performance of reared Atlantic salmon (Salmo salar L.)

Citation

Douglas-Helders, GM and Weir, IJ and O'Brien, DP and Carson, J and Nowak, BF, Effects of husbandry on prevalence of amoebic gill disease and performance of reared Atlantic salmon (Salmo salar L.), Aquaculture, 241, (1-4) pp. 21-30. ISSN 0044-8486 (2004) [Refereed Article]

DOI: doi:10.1016/j.aquaculture.2004.07.026

Abstract

Improved husbandry has been identified as an area that may alleviate amoebic gill disease (AGD) on Tasmanian salmon farms. We report results of three trials that aimed to reduce AGD prevalence and/or minimise losses associated with AGD. In the first trial, cages were rotated between different sites and data compared to stationary cages that remained on a reference site; this arrangement was repeated over two consecutive years. The second trial studied the effect of prophylactic freshwater bathing, while the third trial considered the effects of sea cage size. All trials evaluated the effect of treatment on AGD prevalence, fish biomass gain, and the percentage of mortalities. No significant reduction of AGD prevalence was detected in terms of Neoparamoeba presence on the gills as measured by the immuno-dot blot assay. However, fish from the rotated cages showed a significant longer period between freshwater baths (P=0.037), and the mean biomass in the rotated cages (P=0.038 in year 1 and P=0.041 in year 2), and the non-prophylactic bathed cages (P=0.048) was significantly higher at the end of the trials. The mortality rate was not affected by any of the treatments. The results of these trials suggest that impact of AGD on salmon industry can be offset by adjustment of husbandry methods. © 2004 Elsevier B.V. All rights reserved.

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:Douglas-Helders, GM (Dr Greetje Douglas-Helders)
Author:Carson, J (Dr Jeremy Carson)
Author:Nowak, BF (Professor Barbara Nowak)
ID Code:30082
Year Published:2004
Web of Science® Times Cited:5
Deposited By:TAFI - Aquaculture
Deposited On:2004-08-01
Last Modified:2011-09-20
Downloads:0

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