Infection dynamics of marine Eubothrium sp. (Cestoda) in farmed Atlantic salmon

Infections with marine tapeworms have been reported as an increasing problem in aquaculture of Atlantic salmon (Salmo salar L.) in Norway over the last few years. These are caused by the cestode Eubothrium sp. Little is known about the infection dynamics of this species and there is a need for knowl...

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Main Author: Ruud, Kristian
Format: Master Thesis
Language:English
Published: The University of Bergen 2019
Subjects:
Online Access:https://hdl.handle.net/1956/24123
id ftunivbergen:oai:bora.uib.no:1956/24123
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spelling ftunivbergen:oai:bora.uib.no:1956/24123 2023-05-15T15:30:31+02:00 Infection dynamics of marine Eubothrium sp. (Cestoda) in farmed Atlantic salmon Ruud, Kristian 2019-06-20T22:00:10Z application/pdf https://hdl.handle.net/1956/24123 eng eng The University of Bergen https://hdl.handle.net/1956/24123 Copyright the Author. All rights reserved Infection dynamics Atlantic salmon Eubothrium sp 759906 Master thesis 2019 ftunivbergen 2023-03-14T17:43:33Z Infections with marine tapeworms have been reported as an increasing problem in aquaculture of Atlantic salmon (Salmo salar L.) in Norway over the last few years. These are caused by the cestode Eubothrium sp. Little is known about the infection dynamics of this species and there is a need for knowledge regarding when these infections occur and how they develop. Four cohorts of Atlantic salmon were followed for their first half year at sea and examined for tapeworms. Two of these were launched in autumn 2017 and two in spring 2018. Sampling was planned to be carried out at one month, three months and six months after sea-launch, but some variations occurred due to practical reasons. A total of 531 salmon were examined during the study. Eubothrium sp. was found to follow a seasonal pattern of infection, with the infection pressure being highest in summer-autumn. Cohorts launched to sea in spring were initially exposed to a lower infection pressure. Abundance of the parasite was negatively correlated with fish size at the time of infection, suggesting that smaller fish have a higher risk of infection. This was supported by early stages of the worms mostly being found in fish under the length 35 cm. Little evidence was seen of infections occurring in fish over this size, perhaps due to reduced feeding on the zooplankton that serve as intermediate hosts of Eubothrium sp. This suggests that effective treatment after the fish has passed this size could lower the chances of reinfection, suggesting that treatment would only be needed once. Masteroppgave i fiskehelse FISK399 MAMN-FISK Master Thesis Atlantic salmon Salmo salar University of Bergen: Bergen Open Research Archive (BORA-UiB) Norway
institution Open Polar
collection University of Bergen: Bergen Open Research Archive (BORA-UiB)
op_collection_id ftunivbergen
language English
topic Infection dynamics
Atlantic salmon
Eubothrium sp
759906
spellingShingle Infection dynamics
Atlantic salmon
Eubothrium sp
759906
Ruud, Kristian
Infection dynamics of marine Eubothrium sp. (Cestoda) in farmed Atlantic salmon
topic_facet Infection dynamics
Atlantic salmon
Eubothrium sp
759906
description Infections with marine tapeworms have been reported as an increasing problem in aquaculture of Atlantic salmon (Salmo salar L.) in Norway over the last few years. These are caused by the cestode Eubothrium sp. Little is known about the infection dynamics of this species and there is a need for knowledge regarding when these infections occur and how they develop. Four cohorts of Atlantic salmon were followed for their first half year at sea and examined for tapeworms. Two of these were launched in autumn 2017 and two in spring 2018. Sampling was planned to be carried out at one month, three months and six months after sea-launch, but some variations occurred due to practical reasons. A total of 531 salmon were examined during the study. Eubothrium sp. was found to follow a seasonal pattern of infection, with the infection pressure being highest in summer-autumn. Cohorts launched to sea in spring were initially exposed to a lower infection pressure. Abundance of the parasite was negatively correlated with fish size at the time of infection, suggesting that smaller fish have a higher risk of infection. This was supported by early stages of the worms mostly being found in fish under the length 35 cm. Little evidence was seen of infections occurring in fish over this size, perhaps due to reduced feeding on the zooplankton that serve as intermediate hosts of Eubothrium sp. This suggests that effective treatment after the fish has passed this size could lower the chances of reinfection, suggesting that treatment would only be needed once. Masteroppgave i fiskehelse FISK399 MAMN-FISK
format Master Thesis
author Ruud, Kristian
author_facet Ruud, Kristian
author_sort Ruud, Kristian
title Infection dynamics of marine Eubothrium sp. (Cestoda) in farmed Atlantic salmon
title_short Infection dynamics of marine Eubothrium sp. (Cestoda) in farmed Atlantic salmon
title_full Infection dynamics of marine Eubothrium sp. (Cestoda) in farmed Atlantic salmon
title_fullStr Infection dynamics of marine Eubothrium sp. (Cestoda) in farmed Atlantic salmon
title_full_unstemmed Infection dynamics of marine Eubothrium sp. (Cestoda) in farmed Atlantic salmon
title_sort infection dynamics of marine eubothrium sp. (cestoda) in farmed atlantic salmon
publisher The University of Bergen
publishDate 2019
url https://hdl.handle.net/1956/24123
geographic Norway
geographic_facet Norway
genre Atlantic salmon
Salmo salar
genre_facet Atlantic salmon
Salmo salar
op_relation https://hdl.handle.net/1956/24123
op_rights Copyright the Author. All rights reserved
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