Patterns of Ichthyobodo necator sensu stricto infections on hatchery-reared Atlantic salmon Salmo salar in Norway
Infection patterns with ectoparasitic flagellates belonging to the genus Ichthyobodo were studied in an Atlantic salmon Salmo salar (L.) hatchery in western Norway during an 11 mo period, from eyed eggs to smoltification. Since the earlier species designation Ichthyobodo necator (sensu lato, s.l.) h...
Published in: | Diseases of Aquatic Organisms |
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2010
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Online Access: | http://hdl.handle.net/11250/109130 https://doi.org/10.3354/dao02173 |
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ftimr:oai:imr.brage.unit.no:11250/109130 2023-05-15T15:31:50+02:00 Patterns of Ichthyobodo necator sensu stricto infections on hatchery-reared Atlantic salmon Salmo salar in Norway Isaksen, Trond E. Karlsbakk, Egil Sundnes, Gunnar Nylund, Are 2010-02-17 application/pdf http://hdl.handle.net/11250/109130 https://doi.org/10.3354/dao02173 eng eng Inter-Research urn:issn:0177-5103 urn:issn:1616-1580 http://hdl.handle.net/11250/109130 http://dx.doi.org/10.3354/dao02173 207-214 88 Diseases of Aquatic Organisms 3 salmon laks fish diseases fiskesykdommer monitoring overvåkning VDP::Agriculture and fishery disciplines: 900::Fisheries science: 920::Resource biology: 921 VDP::Agriculture and fishery disciplines: 900::Fisheries science: 920::Fish health: 923 Journal article Peer reviewed 2010 ftimr https://doi.org/10.3354/dao02173 2021-09-23T20:14:51Z Infection patterns with ectoparasitic flagellates belonging to the genus Ichthyobodo were studied in an Atlantic salmon Salmo salar (L.) hatchery in western Norway during an 11 mo period, from eyed eggs to smoltification. Since the earlier species designation Ichthyobodo necator (sensu lato, s.l.) has been shown to represent a complex of several species, the epizootiology of different Ichthyobodo spp. is poorly known. Therefore, we employed molecular methods to ascertain the specific identity of the parasites detected in our study. Only I. necator in the recently redefined and restricted sense occurred (I. necator sensu stricto, s.s.). We observed a 2-peak pattern of infection; the first peak occurred among fry in March and the second peak among fingerlings and pre-smolt in August and September. Skin lesions observed on fingerlings and pre-smolt were significantly associated with Ichthyobodo infections. Also, these infections were negatively correlated with both haematocrit values (Hct) and the condition factor (K) of the fish. The patterns of infection on the farmed salmon suggest that I. necator s.s. is an opportunistic parasite of salmon, flourishing in periods when susceptible hosts are present and the environment favours parasite proliferation. Our study is the first to detect and identify I. necator s.s. on wild-caught adult salmonids (brown trout S. trutta L.). Wild salmonids and sticklebacks Gasterosteus aculeatus (L.) caught in the lakes serving as a water supply to the hatchery were found infected with I. necator s.s., hence these are the likely sources of parasites entering the hatchery via the inlet water. 2015-02-17 Article in Journal/Newspaper Atlantic salmon Salmo salar Institute for Marine Research: Brage IMR Norway Diseases of Aquatic Organisms 88 207 214 |
institution |
Open Polar |
collection |
Institute for Marine Research: Brage IMR |
op_collection_id |
ftimr |
language |
English |
topic |
salmon laks fish diseases fiskesykdommer monitoring overvåkning VDP::Agriculture and fishery disciplines: 900::Fisheries science: 920::Resource biology: 921 VDP::Agriculture and fishery disciplines: 900::Fisheries science: 920::Fish health: 923 |
spellingShingle |
salmon laks fish diseases fiskesykdommer monitoring overvåkning VDP::Agriculture and fishery disciplines: 900::Fisheries science: 920::Resource biology: 921 VDP::Agriculture and fishery disciplines: 900::Fisheries science: 920::Fish health: 923 Isaksen, Trond E. Karlsbakk, Egil Sundnes, Gunnar Nylund, Are Patterns of Ichthyobodo necator sensu stricto infections on hatchery-reared Atlantic salmon Salmo salar in Norway |
topic_facet |
salmon laks fish diseases fiskesykdommer monitoring overvåkning VDP::Agriculture and fishery disciplines: 900::Fisheries science: 920::Resource biology: 921 VDP::Agriculture and fishery disciplines: 900::Fisheries science: 920::Fish health: 923 |
description |
Infection patterns with ectoparasitic flagellates belonging to the genus Ichthyobodo were studied in an Atlantic salmon Salmo salar (L.) hatchery in western Norway during an 11 mo period, from eyed eggs to smoltification. Since the earlier species designation Ichthyobodo necator (sensu lato, s.l.) has been shown to represent a complex of several species, the epizootiology of different Ichthyobodo spp. is poorly known. Therefore, we employed molecular methods to ascertain the specific identity of the parasites detected in our study. Only I. necator in the recently redefined and restricted sense occurred (I. necator sensu stricto, s.s.). We observed a 2-peak pattern of infection; the first peak occurred among fry in March and the second peak among fingerlings and pre-smolt in August and September. Skin lesions observed on fingerlings and pre-smolt were significantly associated with Ichthyobodo infections. Also, these infections were negatively correlated with both haematocrit values (Hct) and the condition factor (K) of the fish. The patterns of infection on the farmed salmon suggest that I. necator s.s. is an opportunistic parasite of salmon, flourishing in periods when susceptible hosts are present and the environment favours parasite proliferation. Our study is the first to detect and identify I. necator s.s. on wild-caught adult salmonids (brown trout S. trutta L.). Wild salmonids and sticklebacks Gasterosteus aculeatus (L.) caught in the lakes serving as a water supply to the hatchery were found infected with I. necator s.s., hence these are the likely sources of parasites entering the hatchery via the inlet water. 2015-02-17 |
format |
Article in Journal/Newspaper |
author |
Isaksen, Trond E. Karlsbakk, Egil Sundnes, Gunnar Nylund, Are |
author_facet |
Isaksen, Trond E. Karlsbakk, Egil Sundnes, Gunnar Nylund, Are |
author_sort |
Isaksen, Trond E. |
title |
Patterns of Ichthyobodo necator sensu stricto infections on hatchery-reared Atlantic salmon Salmo salar in Norway |
title_short |
Patterns of Ichthyobodo necator sensu stricto infections on hatchery-reared Atlantic salmon Salmo salar in Norway |
title_full |
Patterns of Ichthyobodo necator sensu stricto infections on hatchery-reared Atlantic salmon Salmo salar in Norway |
title_fullStr |
Patterns of Ichthyobodo necator sensu stricto infections on hatchery-reared Atlantic salmon Salmo salar in Norway |
title_full_unstemmed |
Patterns of Ichthyobodo necator sensu stricto infections on hatchery-reared Atlantic salmon Salmo salar in Norway |
title_sort |
patterns of ichthyobodo necator sensu stricto infections on hatchery-reared atlantic salmon salmo salar in norway |
publisher |
Inter-Research |
publishDate |
2010 |
url |
http://hdl.handle.net/11250/109130 https://doi.org/10.3354/dao02173 |
geographic |
Norway |
geographic_facet |
Norway |
genre |
Atlantic salmon Salmo salar |
genre_facet |
Atlantic salmon Salmo salar |
op_source |
207-214 88 Diseases of Aquatic Organisms 3 |
op_relation |
urn:issn:0177-5103 urn:issn:1616-1580 http://hdl.handle.net/11250/109130 http://dx.doi.org/10.3354/dao02173 |
op_doi |
https://doi.org/10.3354/dao02173 |
container_title |
Diseases of Aquatic Organisms |
container_volume |
88 |
container_start_page |
207 |
op_container_end_page |
214 |
_version_ |
1766362350285225984 |