Paranucleospora theridion (Microsporidia) infection dynamics in farmed Atlantic salmon Salmo salar put to sea in spring and autumn
The microsporidian Paranucleospora theridion (syn. Desmozoon lepeophtheirii) is a parasite of Atlantic salmon Salmo salar and also a hyperparasite of the salmon louse Lepeophtheirus salmonis. The parasite develops 2 types of spores in salmon, cytoplasmic spores in phagocytes and intranuclear spores...
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Online Access: | http://hdl.handle.net/11250/109246 https://doi.org/10.3354/dao02464 |
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ftimr:oai:imr.brage.unit.no:11250/109246 2023-05-15T15:31:39+02:00 Paranucleospora theridion (Microsporidia) infection dynamics in farmed Atlantic salmon Salmo salar put to sea in spring and autumn Sveen, Silje Øverland, Hanne Karlsbakk, Egil Nylund, Are 2012-10-10 application/pdf http://hdl.handle.net/11250/109246 https://doi.org/10.3354/dao02464 eng eng Inter-Research urn:issn:0177-5103 urn:issn:1616-1580 http://hdl.handle.net/11250/109246 http://dx.doi.org/10.3354/dao02464 43-49 101 Diseases of Aquatic Organisms 1 salmon lice lakselus temperature temperatur VDP::Agriculture and fishery disciplines: 900::Fisheries science: 920::Resource biology: 921 VDP::Agriculture and fishery disciplines: 900::Fisheries science: 920::Aquaculture: 922 VDP::Social science: 200::Library and information science: 320::Knowledge retrieval and organization: 323 Journal article Peer reviewed 2012 ftimr https://doi.org/10.3354/dao02464 2021-09-23T20:15:39Z The microsporidian Paranucleospora theridion (syn. Desmozoon lepeophtheirii) is a parasite of Atlantic salmon Salmo salar and also a hyperparasite of the salmon louse Lepeophtheirus salmonis. The parasite develops 2 types of spores in salmon, cytoplasmic spores in phagocytes and intranuclear spores in epidermal cells. The former type of development is assumed to be propagative (autoinfection), while the epidermal spores transfer the parasite to lice. Development in lice is extensive, with the formation of xenoma-like hypertrophic cells filled with microsporidian spores. We show that salmon are infected in the absence of lice, likely through waterborne spores that initiate infections in the gills. During summer and autumn the parasite propagates in the kidney, as evidenced by peaking normalised expression of P. theridion rRNA. Lice become infected during autumn, and develop extensive infections during winter. Lice mortality in winter and spring is likely responsible for a reservoir of spores in the water. Salmon transferred to sea in November (low temperature) did not show involvement of the kidney in parasite propagation and lice on such fish did not become infected. Apparently, low temperatures inhibit normal P. theridion development in salmon. 2017-10-10 Article in Journal/Newspaper Atlantic salmon Salmo salar Institute for Marine Research: Brage IMR Diseases of Aquatic Organisms 101 1 43 49 |
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Open Polar |
collection |
Institute for Marine Research: Brage IMR |
op_collection_id |
ftimr |
language |
English |
topic |
salmon lice lakselus temperature temperatur VDP::Agriculture and fishery disciplines: 900::Fisheries science: 920::Resource biology: 921 VDP::Agriculture and fishery disciplines: 900::Fisheries science: 920::Aquaculture: 922 VDP::Social science: 200::Library and information science: 320::Knowledge retrieval and organization: 323 |
spellingShingle |
salmon lice lakselus temperature temperatur VDP::Agriculture and fishery disciplines: 900::Fisheries science: 920::Resource biology: 921 VDP::Agriculture and fishery disciplines: 900::Fisheries science: 920::Aquaculture: 922 VDP::Social science: 200::Library and information science: 320::Knowledge retrieval and organization: 323 Sveen, Silje Øverland, Hanne Karlsbakk, Egil Nylund, Are Paranucleospora theridion (Microsporidia) infection dynamics in farmed Atlantic salmon Salmo salar put to sea in spring and autumn |
topic_facet |
salmon lice lakselus temperature temperatur VDP::Agriculture and fishery disciplines: 900::Fisheries science: 920::Resource biology: 921 VDP::Agriculture and fishery disciplines: 900::Fisheries science: 920::Aquaculture: 922 VDP::Social science: 200::Library and information science: 320::Knowledge retrieval and organization: 323 |
description |
The microsporidian Paranucleospora theridion (syn. Desmozoon lepeophtheirii) is a parasite of Atlantic salmon Salmo salar and also a hyperparasite of the salmon louse Lepeophtheirus salmonis. The parasite develops 2 types of spores in salmon, cytoplasmic spores in phagocytes and intranuclear spores in epidermal cells. The former type of development is assumed to be propagative (autoinfection), while the epidermal spores transfer the parasite to lice. Development in lice is extensive, with the formation of xenoma-like hypertrophic cells filled with microsporidian spores. We show that salmon are infected in the absence of lice, likely through waterborne spores that initiate infections in the gills. During summer and autumn the parasite propagates in the kidney, as evidenced by peaking normalised expression of P. theridion rRNA. Lice become infected during autumn, and develop extensive infections during winter. Lice mortality in winter and spring is likely responsible for a reservoir of spores in the water. Salmon transferred to sea in November (low temperature) did not show involvement of the kidney in parasite propagation and lice on such fish did not become infected. Apparently, low temperatures inhibit normal P. theridion development in salmon. 2017-10-10 |
format |
Article in Journal/Newspaper |
author |
Sveen, Silje Øverland, Hanne Karlsbakk, Egil Nylund, Are |
author_facet |
Sveen, Silje Øverland, Hanne Karlsbakk, Egil Nylund, Are |
author_sort |
Sveen, Silje |
title |
Paranucleospora theridion (Microsporidia) infection dynamics in farmed Atlantic salmon Salmo salar put to sea in spring and autumn |
title_short |
Paranucleospora theridion (Microsporidia) infection dynamics in farmed Atlantic salmon Salmo salar put to sea in spring and autumn |
title_full |
Paranucleospora theridion (Microsporidia) infection dynamics in farmed Atlantic salmon Salmo salar put to sea in spring and autumn |
title_fullStr |
Paranucleospora theridion (Microsporidia) infection dynamics in farmed Atlantic salmon Salmo salar put to sea in spring and autumn |
title_full_unstemmed |
Paranucleospora theridion (Microsporidia) infection dynamics in farmed Atlantic salmon Salmo salar put to sea in spring and autumn |
title_sort |
paranucleospora theridion (microsporidia) infection dynamics in farmed atlantic salmon salmo salar put to sea in spring and autumn |
publisher |
Inter-Research |
publishDate |
2012 |
url |
http://hdl.handle.net/11250/109246 https://doi.org/10.3354/dao02464 |
genre |
Atlantic salmon Salmo salar |
genre_facet |
Atlantic salmon Salmo salar |
op_source |
43-49 101 Diseases of Aquatic Organisms 1 |
op_relation |
urn:issn:0177-5103 urn:issn:1616-1580 http://hdl.handle.net/11250/109246 http://dx.doi.org/10.3354/dao02464 |
op_doi |
https://doi.org/10.3354/dao02464 |
container_title |
Diseases of Aquatic Organisms |
container_volume |
101 |
container_issue |
1 |
container_start_page |
43 |
op_container_end_page |
49 |
_version_ |
1766362184386871296 |