Metabolic effects of amoebic gill disease (AGD) and chloramines-T exposure in seawater-acclimated Atlantic salmon Salmo salar
ABSTRACT: Our aim was to determine possible metabolic effects amoebic gill disease (AGD) onAtlantic salmon Salmo salar. Standard (RS) and routine (RROU) metabolic rates were evaluated by continuallymeasuring oxygen consumption in 2 independent tanks of fish (18.69 1.01 kg m3, mean SE). Active metabo...
| Published in: | Diseases of Aquatic Organisms |
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| Main Authors: | , , |
| Format: | Article in Journal/Newspaper |
| Language: | English |
| Published: |
Inter-Research
2007
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| Subjects: | |
| Online Access: | https://doi.org/10.3354/dao01853 http://www.ncbi.nlm.nih.gov/pubmed/18159671 http://ecite.utas.edu.au/77760 |
| Summary: | ABSTRACT: Our aim was to determine possible metabolic effects amoebic gill disease (AGD) onAtlantic salmon Salmo salar. Standard (RS) and routine (RROU) metabolic rates were evaluated by continuallymeasuring 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 protocoland 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 AGDaffectedsalmon (2300 cells l1). No significant elevations in RACT or metabolic scope were detected 3 dpost-infection and 2 d post-treatment; however, significant elevations in RS and RROU were detected3 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 ofAGD-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 continuedthe upward trend 1 d following treatment. These results suggest that over the course of AGDdevelopment, RS in Atlantic salmon increases. Therefore, considering the physical conditions whichconstrain RACT, we expect that metabolic scope would become compromised in fish more heavilyaffected with AGD. Treatment with CL-T shows promise for mitigating the respiratory effects of AGDand potentially minimising the loss of metabolic scope.KEY WORDS: Amoebic gill disease AGD Oxygen uptake Metabolic scope Chloramine-T Atlantic salmon |
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