Effectiveness of commercial freshwater bathing as a treatment against amoebic gill disease in Atlantic salmon
Amoebic gill disease (AGD) is the most serious health problem in Atlantic salmon culture in Tasmania, Australia. This disease is caused by an amoeboid protozoan, Paramoeba pemaquidensis and has resulted in seacage mortalities as high as 50%. Current treatment involves fish being bathed in freshwater...
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ftunivtasecite:oai:ecite.utas.edu.au:21157 2023-05-15T15:30:32+02:00 Effectiveness of commercial freshwater bathing as a treatment against amoebic gill disease in Atlantic salmon Parsons, HJ Nowak, BF Fisk, DM Powell, M 2001 https://doi.org/10.1016/S0044-8486(00)00567-6 http://ecite.utas.edu.au/21157 en eng Elsevier http://dx.doi.org/10.1016/S0044-8486(00)00567-6 Parsons, HJ and Nowak, BF and Fisk, DM and Powell, M, Effectiveness of commercial freshwater bathing as a treatment against amoebic gill disease in Atlantic salmon, Aquaculture, 195, (3-4) pp. 205-210. ISSN 0044-8486 (2001) [Refereed Article] http://ecite.utas.edu.au/21157 Agricultural and Veterinary Sciences Fisheries Sciences Aquaculture Refereed Article PeerReviewed 2001 ftunivtasecite https://doi.org/10.1016/S0044-8486(00)00567-6 2019-12-13T21:03:24Z Amoebic gill disease (AGD) is the most serious health problem in Atlantic salmon culture in Tasmania, Australia. This disease is caused by an amoeboid protozoan, Paramoeba pemaquidensis and has resulted in seacage mortalities as high as 50%. Current treatment involves fish being bathed in freshwater for periods of 2-3 h. The aim of this project was to determine the effectiveness of commercial freshwater bathing. Gill samples were collected from Atlantic salmon before and after routine freshwater bathing. Each fish was weighed, measured (fork length), gross AGD score determined, gill smears stained with "Diff Quick" and trypan blue and gill arches examined using routine histology. Freshwater bathing significantly reduced the prevalence of characteristic mucoid patches on the gills, presence of paramoebae on gill smears and the number of paramoebae per lesion in histological sections (P < 0.05). Trypan blue staining of gill smears revealed that 27% of the paramoebae were still alive after 2-h freshwater bathing, although the numbers appeared to be lower than before freshwater bathing. Paramoebae were commonly found (71.2%) in cysts formed by fused gill lamellae within AGD lesions. Before the bathing, only 31.9% of paramoebae were present within the cysts and the remaining parasites were present on the surface of the hyperplastic lesions. Results of this study showed that freshwater bathing is effective in the removal of the majority of paramoebae associated with fish infected with AGD. However, alterations in bathing procedure or an alternative treatment may be required to achieve the total removal of paramoebae from gills of Atlantic salmon. 2001 Elsevier Science B.V. Article in Journal/Newspaper Atlantic salmon eCite UTAS (University of Tasmania) Aquaculture 195 3-4 205 210 |
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eCite UTAS (University of Tasmania) |
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ftunivtasecite |
language |
English |
topic |
Agricultural and Veterinary Sciences Fisheries Sciences Aquaculture |
spellingShingle |
Agricultural and Veterinary Sciences Fisheries Sciences Aquaculture Parsons, HJ Nowak, BF Fisk, DM Powell, M Effectiveness of commercial freshwater bathing as a treatment against amoebic gill disease in Atlantic salmon |
topic_facet |
Agricultural and Veterinary Sciences Fisheries Sciences Aquaculture |
description |
Amoebic gill disease (AGD) is the most serious health problem in Atlantic salmon culture in Tasmania, Australia. This disease is caused by an amoeboid protozoan, Paramoeba pemaquidensis and has resulted in seacage mortalities as high as 50%. Current treatment involves fish being bathed in freshwater for periods of 2-3 h. The aim of this project was to determine the effectiveness of commercial freshwater bathing. Gill samples were collected from Atlantic salmon before and after routine freshwater bathing. Each fish was weighed, measured (fork length), gross AGD score determined, gill smears stained with "Diff Quick" and trypan blue and gill arches examined using routine histology. Freshwater bathing significantly reduced the prevalence of characteristic mucoid patches on the gills, presence of paramoebae on gill smears and the number of paramoebae per lesion in histological sections (P < 0.05). Trypan blue staining of gill smears revealed that 27% of the paramoebae were still alive after 2-h freshwater bathing, although the numbers appeared to be lower than before freshwater bathing. Paramoebae were commonly found (71.2%) in cysts formed by fused gill lamellae within AGD lesions. Before the bathing, only 31.9% of paramoebae were present within the cysts and the remaining parasites were present on the surface of the hyperplastic lesions. Results of this study showed that freshwater bathing is effective in the removal of the majority of paramoebae associated with fish infected with AGD. However, alterations in bathing procedure or an alternative treatment may be required to achieve the total removal of paramoebae from gills of Atlantic salmon. 2001 Elsevier Science B.V. |
format |
Article in Journal/Newspaper |
author |
Parsons, HJ Nowak, BF Fisk, DM Powell, M |
author_facet |
Parsons, HJ Nowak, BF Fisk, DM Powell, M |
author_sort |
Parsons, HJ |
title |
Effectiveness of commercial freshwater bathing as a treatment against amoebic gill disease in Atlantic salmon |
title_short |
Effectiveness of commercial freshwater bathing as a treatment against amoebic gill disease in Atlantic salmon |
title_full |
Effectiveness of commercial freshwater bathing as a treatment against amoebic gill disease in Atlantic salmon |
title_fullStr |
Effectiveness of commercial freshwater bathing as a treatment against amoebic gill disease in Atlantic salmon |
title_full_unstemmed |
Effectiveness of commercial freshwater bathing as a treatment against amoebic gill disease in Atlantic salmon |
title_sort |
effectiveness of commercial freshwater bathing as a treatment against amoebic gill disease in atlantic salmon |
publisher |
Elsevier |
publishDate |
2001 |
url |
https://doi.org/10.1016/S0044-8486(00)00567-6 http://ecite.utas.edu.au/21157 |
genre |
Atlantic salmon |
genre_facet |
Atlantic salmon |
op_relation |
http://dx.doi.org/10.1016/S0044-8486(00)00567-6 Parsons, HJ and Nowak, BF and Fisk, DM and Powell, M, Effectiveness of commercial freshwater bathing as a treatment against amoebic gill disease in Atlantic salmon, Aquaculture, 195, (3-4) pp. 205-210. ISSN 0044-8486 (2001) [Refereed Article] http://ecite.utas.edu.au/21157 |
op_doi |
https://doi.org/10.1016/S0044-8486(00)00567-6 |
container_title |
Aquaculture |
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195 |
container_issue |
3-4 |
container_start_page |
205 |
op_container_end_page |
210 |
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1766360978332581888 |