Spore-forming parasites infecting muscles of freshwater fishes : ecology and epidemiology
Fish parasites may potentially harm fisheries and aquaculture. Infected fish are unusable, even though they would not pose a direct risk to human health. The aim of this thesis was to investigate the ecology and epidemiology of three previously unknown or poorly known spore-forming parasites infecti...
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University of Jyväskylä
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Online Access: | http://urn.fi/URN:ISBN:978-951-39-7109-0 |
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ftjyvaeskylaenun:oai:jyx.jyu.fi:123456789/54309 2023-05-15T15:47:15+02:00 Spore-forming parasites infecting muscles of freshwater fishes : ecology and epidemiology Ahonen, Hanna 2017 1 verkkoaineisto (60 sivua) : kuvitettu, karttoja application/pdf http://urn.fi/URN:ISBN:978-951-39-7109-0 eng eng University of Jyväskylä Jyväskylä studies in biological and environmental science Yhteenveto-osa ja 4 eripainosta julkaistu myös painettuna. 1456-9701 332 978-951-39-7109-0 oai:jykdok.linneanet.fi:1703011 URN:ISBN:978-951-39-7109-0 http://urn.fi/URN:ISBN:978-951-39-7109-0 openAccess parasitism host-parasite relationship fishery aquaculture Myosporidium sparguei Microsporidium luciopercae Henneguya zschokkei kalat loiset itiöt parasitismi infektiot kalataudit vesiviljely (kalatalous) kalanviljely sienet polttiaiseläimet Diss. Text Väitöskirja Doctoral dissertation 2017 ftjyvaeskylaenun 2022-04-27T22:53:58Z Fish parasites may potentially harm fisheries and aquaculture. Infected fish are unusable, even though they would not pose a direct risk to human health. The aim of this thesis was to investigate the ecology and epidemiology of three previously unknown or poorly known spore-forming parasites infecting muscles of economically important fish species. The first novel microsporidian species, here described as Microsporidium luciopercae, was found from pike-perch (Sander lucioperca) and European perch (Perca fluviatilis) and formed opaque-looking patches in the muscles. The second novel microsporidian species, Myosporidium spraguei, was found from pike-perch and burbot (Lota lota) and occurred within xenomas in the musculature. The third muscle-dwelling parasite, Henneguya zschokkei (Cnidaria), formed white plasmodia in the muscle of whitefish (Coregonus lavaretus). Among the six study lakes, the prevalence of M. luciopercae in wild pike-perch and perch varied from 0 to 1 %, while M. spraguei was more common (prevalence of 5–26 % in pike-perch and 65 % in burbot). M. spraguei was strongly aggregated and most abundant in the middle-sized (37–45 cm) pike-perch and in larger burbot (> 35 cm), but the infection was not related to host sex, sampling season or host condition. In the case of H. zschokkei, in two inland fish farms, one year-old whitefish were virtually uninfected, but the prevalence of infection was higher in 2 and 3 year old fish (up to 36 % of 3 year old fish were infected). New infections appeared seasonally in July-August. Neither the size of plasmodia nor the proportion of different plasmodium types changed from 2 to 3 year old fish, suggesting slow development of H. zschokkei in whitefish. However, the proportion of infected fish with melanised plasmodia increased with fish age, suggesting an age-dependent host response against this strongly aggregated parasite. Doctoral or Postdoctoral Thesis Burbot Lota lota lota JYX - Jyväskylä University Digital Archive |
institution |
Open Polar |
collection |
JYX - Jyväskylä University Digital Archive |
op_collection_id |
ftjyvaeskylaenun |
language |
English |
topic |
parasitism host-parasite relationship fishery aquaculture Myosporidium sparguei Microsporidium luciopercae Henneguya zschokkei kalat loiset itiöt parasitismi infektiot kalataudit vesiviljely (kalatalous) kalanviljely sienet polttiaiseläimet |
spellingShingle |
parasitism host-parasite relationship fishery aquaculture Myosporidium sparguei Microsporidium luciopercae Henneguya zschokkei kalat loiset itiöt parasitismi infektiot kalataudit vesiviljely (kalatalous) kalanviljely sienet polttiaiseläimet Ahonen, Hanna Spore-forming parasites infecting muscles of freshwater fishes : ecology and epidemiology |
topic_facet |
parasitism host-parasite relationship fishery aquaculture Myosporidium sparguei Microsporidium luciopercae Henneguya zschokkei kalat loiset itiöt parasitismi infektiot kalataudit vesiviljely (kalatalous) kalanviljely sienet polttiaiseläimet |
description |
Fish parasites may potentially harm fisheries and aquaculture. Infected fish are unusable, even though they would not pose a direct risk to human health. The aim of this thesis was to investigate the ecology and epidemiology of three previously unknown or poorly known spore-forming parasites infecting muscles of economically important fish species. The first novel microsporidian species, here described as Microsporidium luciopercae, was found from pike-perch (Sander lucioperca) and European perch (Perca fluviatilis) and formed opaque-looking patches in the muscles. The second novel microsporidian species, Myosporidium spraguei, was found from pike-perch and burbot (Lota lota) and occurred within xenomas in the musculature. The third muscle-dwelling parasite, Henneguya zschokkei (Cnidaria), formed white plasmodia in the muscle of whitefish (Coregonus lavaretus). Among the six study lakes, the prevalence of M. luciopercae in wild pike-perch and perch varied from 0 to 1 %, while M. spraguei was more common (prevalence of 5–26 % in pike-perch and 65 % in burbot). M. spraguei was strongly aggregated and most abundant in the middle-sized (37–45 cm) pike-perch and in larger burbot (> 35 cm), but the infection was not related to host sex, sampling season or host condition. In the case of H. zschokkei, in two inland fish farms, one year-old whitefish were virtually uninfected, but the prevalence of infection was higher in 2 and 3 year old fish (up to 36 % of 3 year old fish were infected). New infections appeared seasonally in July-August. Neither the size of plasmodia nor the proportion of different plasmodium types changed from 2 to 3 year old fish, suggesting slow development of H. zschokkei in whitefish. However, the proportion of infected fish with melanised plasmodia increased with fish age, suggesting an age-dependent host response against this strongly aggregated parasite. |
format |
Doctoral or Postdoctoral Thesis |
author |
Ahonen, Hanna |
author_facet |
Ahonen, Hanna |
author_sort |
Ahonen, Hanna |
title |
Spore-forming parasites infecting muscles of freshwater fishes : ecology and epidemiology |
title_short |
Spore-forming parasites infecting muscles of freshwater fishes : ecology and epidemiology |
title_full |
Spore-forming parasites infecting muscles of freshwater fishes : ecology and epidemiology |
title_fullStr |
Spore-forming parasites infecting muscles of freshwater fishes : ecology and epidemiology |
title_full_unstemmed |
Spore-forming parasites infecting muscles of freshwater fishes : ecology and epidemiology |
title_sort |
spore-forming parasites infecting muscles of freshwater fishes : ecology and epidemiology |
publisher |
University of Jyväskylä |
publishDate |
2017 |
url |
http://urn.fi/URN:ISBN:978-951-39-7109-0 |
genre |
Burbot Lota lota lota |
genre_facet |
Burbot Lota lota lota |
op_relation |
Jyväskylä studies in biological and environmental science Yhteenveto-osa ja 4 eripainosta julkaistu myös painettuna. 1456-9701 332 978-951-39-7109-0 oai:jykdok.linneanet.fi:1703011 URN:ISBN:978-951-39-7109-0 http://urn.fi/URN:ISBN:978-951-39-7109-0 |
op_rights |
openAccess |
_version_ |
1766382044152070144 |