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Metabolic effects of amoebic gill disease (AGD) and chloramines-T exposure in seawater-acclimated Atlantic salmon Salmo salar

Citation

Leef, MJ and Harris, J and Powell, MD, Metabolic effects of amoebic gill disease (AGD) and chloramines-T exposure in seawater-acclimated Atlantic salmon Salmo salar, Diseases of Aquatic Organisms, 78 pp. 37-44. ISSN 0177-5103 (2007) [Refereed Article]

DOI: doi:10.3354/dao01853

Abstract

ABSTRACT: Our aim was to determine possible metabolic effects amoebic gill disease (AGD) on Atlantic salmon Salmo salar. Standard (RS) and routine (RROU) metabolic rates were evaluated by continually measuring oxygen consumption in 2 independent tanks of fish (18.69 1.01 kg m3, mean SE). Active metabolic rate (RACT) and metabolic scope (RACT RS) were assessed using a chasing protocol and determined at 3 time periods: (1) pre-infection, (2) 3 d post-infection, and (3) 2 d post-treatment. On Day 3 of the study, the fish were infected with amoebae isolated from the gills of AGDaffected salmon (2300 cells l1). No significant elevations in RACT or metabolic scope were detected 3 d post-infection and 2 d post-treatment; however, significant elevations in RS and RROU were detected 3 d post-infection and 2 d post-treatment. Assessment of RROU data, especially for the light period, also indicated a rise in oxygen consumption rate over the course of the experiment. Treatment of AGD-affected Atlantic salmon with chloramine-T (CL-T) appeared to briefly mitigate the rise in RS, as there was a 30% drop (though non-significant) in RS following treatment. Despite this, RS continued the upward trend 1 d following treatment. These results suggest that over the course of AGD development, RS in Atlantic salmon increases. Therefore, considering the physical conditions which constrain RACT, we expect that metabolic scope would become compromised in fish more heavily affected with AGD. Treatment with CL-T shows promise for mitigating the respiratory effects of AGD and potentially minimising the loss of metabolic scope. KEY WORDS: Amoebic gill disease AGD Oxygen uptake Metabolic scope Chloramine-T Atlantic salmon

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:Aquaculture Crustaceans (excl. Rock Lobster and Prawns)
Author:Leef, MJ (Dr Melanie Leef)
Author:Harris, J (Dr James Harris)
Author:Powell, MD (Dr Mark Powell)
ID Code:77760
Year Published:2007
Web of Science® Times Cited:6
Deposited By:NC Marine Conservation and Resource Sustainability
Deposited On:2012-05-24
Last Modified:2012-10-01
Downloads:0

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