Mortality patterns during the freshwater production phase of salmonids in Norway
Mortality in Norwegian salmonid aquaculture has a major influence on fish welfare and represents economic losses for producers. We reviewed the estimated monthly mortality for freshwater farms with Atlantic salmon and rainbow trout between 2011 and 2019. We built a regression model for mortality whi...
Published in: | Journal of Fish Diseases |
---|---|
Main Authors: | , , , , , |
Format: | Article in Journal/Newspaper |
Language: | English |
Published: |
2021
|
Subjects: | |
Online Access: | http://hdl.handle.net/10852/89645 http://urn.nb.no/URN:NBN:no-92240 https://doi.org/10.1111/jfd.13522 |
id |
ftoslouniv:oai:www.duo.uio.no:10852/89645 |
---|---|
record_format |
openpolar |
spelling |
ftoslouniv:oai:www.duo.uio.no:10852/89645 2023-05-15T15:31:25+02:00 Mortality patterns during the freshwater production phase of salmonids in Norway Gåsnes, Siri Kristine Silva de Oliveira, Victor Henrique Gismervik, Kristine Ahimbisibwe, Ashley Tørud, Brit Jensen, Britt Bang 2021-09-02T10:08:42Z http://hdl.handle.net/10852/89645 http://urn.nb.no/URN:NBN:no-92240 https://doi.org/10.1111/jfd.13522 EN eng NFR/294647 http://urn.nb.no/URN:NBN:no-92240 Gåsnes, Siri Kristine Silva de Oliveira, Victor Henrique Gismervik, Kristine Ahimbisibwe, Ashley Tørud, Brit Jensen, Britt Bang . Mortality patterns during the freshwater production phase of salmonids in Norway. Journal of Fish Diseases. 2021, 44(12), 2083-2096 http://hdl.handle.net/10852/89645 1930695 info:ofi/fmt:kev:mtx:ctx&ctx_ver=Z39.88-2004&rft_val_fmt=info:ofi/fmt:kev:mtx:journal&rft.jtitle=Journal of Fish Diseases&rft.volume=44&rft.spage=2083&rft.date=2021 Journal of Fish Diseases 44 12 2083 2096 https://doi.org/10.1111/jfd.13522 URN:NBN:no-92240 Fulltext https://www.duo.uio.no/bitstream/handle/10852/89645/1/Journal%2Bof%2BFish%2BDiseases%2B-%2B2021%2B-%2BG%2Bsnes%2B-%2BMortality%2Bpatterns%2Bduring%2Bthe%2Bfreshwater%2Bproduction%2Bphase%2Bof%2Bsalmonids%2Bin%2BNorway.pdf Attribution 4.0 International https://creativecommons.org/licenses/by/4.0/ CC-BY 0140-7775 Journal article Tidsskriftartikkel Peer reviewed PublishedVersion 2021 ftoslouniv https://doi.org/10.1111/jfd.13522 2021-12-22T23:33:38Z Mortality in Norwegian salmonid aquaculture has a major influence on fish welfare and represents economic losses for producers. We reviewed the estimated monthly mortality for freshwater farms with Atlantic salmon and rainbow trout between 2011 and 2019. We built a regression model for mortality which included the variables year, weight group, season, region and farm. Additionally, we distributed questionnaires to farmers to gather information regarding potential causes of mortalities. The analysis of data for Atlantic salmon showed that median monthly mortality increased from 0.15% in 2011 (interquartile range [IQR]: 0.06–0.39) to 0.25% (IQR: 0.1–0.67) in 2019. Mortality was highest in the North (0.27%, IQR: 0.11–0.72) and lowest in the Southwest region (0.16%, IQR: 0.07–0.4). The season with highest mortality was summer (0.24%, IQR: 0.1–0.64), while winter had the lowest (0.12%, IQR: 0.05–0.35). The smallest fish (3–12 g) showed highest mortality (0.31%, IQR: 0.14–0.69) compared to heavier fish. Results from the questionnaire showed that infectious or non-infectious diseases were the most commonly reported causes of mortality. The mortality patterns described in this study identifies several important risk factors. Highlighting causal links is an important step to reducing mortality and improving welfare in the freshwater production phase of salmonids in Norway. Article in Journal/Newspaper Atlantic salmon Universitet i Oslo: Digitale utgivelser ved UiO (DUO) Norway Journal of Fish Diseases 44 12 2083 2096 |
institution |
Open Polar |
collection |
Universitet i Oslo: Digitale utgivelser ved UiO (DUO) |
op_collection_id |
ftoslouniv |
language |
English |
description |
Mortality in Norwegian salmonid aquaculture has a major influence on fish welfare and represents economic losses for producers. We reviewed the estimated monthly mortality for freshwater farms with Atlantic salmon and rainbow trout between 2011 and 2019. We built a regression model for mortality which included the variables year, weight group, season, region and farm. Additionally, we distributed questionnaires to farmers to gather information regarding potential causes of mortalities. The analysis of data for Atlantic salmon showed that median monthly mortality increased from 0.15% in 2011 (interquartile range [IQR]: 0.06–0.39) to 0.25% (IQR: 0.1–0.67) in 2019. Mortality was highest in the North (0.27%, IQR: 0.11–0.72) and lowest in the Southwest region (0.16%, IQR: 0.07–0.4). The season with highest mortality was summer (0.24%, IQR: 0.1–0.64), while winter had the lowest (0.12%, IQR: 0.05–0.35). The smallest fish (3–12 g) showed highest mortality (0.31%, IQR: 0.14–0.69) compared to heavier fish. Results from the questionnaire showed that infectious or non-infectious diseases were the most commonly reported causes of mortality. The mortality patterns described in this study identifies several important risk factors. Highlighting causal links is an important step to reducing mortality and improving welfare in the freshwater production phase of salmonids in Norway. |
format |
Article in Journal/Newspaper |
author |
Gåsnes, Siri Kristine Silva de Oliveira, Victor Henrique Gismervik, Kristine Ahimbisibwe, Ashley Tørud, Brit Jensen, Britt Bang |
spellingShingle |
Gåsnes, Siri Kristine Silva de Oliveira, Victor Henrique Gismervik, Kristine Ahimbisibwe, Ashley Tørud, Brit Jensen, Britt Bang Mortality patterns during the freshwater production phase of salmonids in Norway |
author_facet |
Gåsnes, Siri Kristine Silva de Oliveira, Victor Henrique Gismervik, Kristine Ahimbisibwe, Ashley Tørud, Brit Jensen, Britt Bang |
author_sort |
Gåsnes, Siri Kristine |
title |
Mortality patterns during the freshwater production phase of salmonids in Norway |
title_short |
Mortality patterns during the freshwater production phase of salmonids in Norway |
title_full |
Mortality patterns during the freshwater production phase of salmonids in Norway |
title_fullStr |
Mortality patterns during the freshwater production phase of salmonids in Norway |
title_full_unstemmed |
Mortality patterns during the freshwater production phase of salmonids in Norway |
title_sort |
mortality patterns during the freshwater production phase of salmonids in norway |
publishDate |
2021 |
url |
http://hdl.handle.net/10852/89645 http://urn.nb.no/URN:NBN:no-92240 https://doi.org/10.1111/jfd.13522 |
geographic |
Norway |
geographic_facet |
Norway |
genre |
Atlantic salmon |
genre_facet |
Atlantic salmon |
op_source |
0140-7775 |
op_relation |
NFR/294647 http://urn.nb.no/URN:NBN:no-92240 Gåsnes, Siri Kristine Silva de Oliveira, Victor Henrique Gismervik, Kristine Ahimbisibwe, Ashley Tørud, Brit Jensen, Britt Bang . Mortality patterns during the freshwater production phase of salmonids in Norway. Journal of Fish Diseases. 2021, 44(12), 2083-2096 http://hdl.handle.net/10852/89645 1930695 info:ofi/fmt:kev:mtx:ctx&ctx_ver=Z39.88-2004&rft_val_fmt=info:ofi/fmt:kev:mtx:journal&rft.jtitle=Journal of Fish Diseases&rft.volume=44&rft.spage=2083&rft.date=2021 Journal of Fish Diseases 44 12 2083 2096 https://doi.org/10.1111/jfd.13522 URN:NBN:no-92240 Fulltext https://www.duo.uio.no/bitstream/handle/10852/89645/1/Journal%2Bof%2BFish%2BDiseases%2B-%2B2021%2B-%2BG%2Bsnes%2B-%2BMortality%2Bpatterns%2Bduring%2Bthe%2Bfreshwater%2Bproduction%2Bphase%2Bof%2Bsalmonids%2Bin%2BNorway.pdf |
op_rights |
Attribution 4.0 International https://creativecommons.org/licenses/by/4.0/ |
op_rightsnorm |
CC-BY |
op_doi |
https://doi.org/10.1111/jfd.13522 |
container_title |
Journal of Fish Diseases |
container_volume |
44 |
container_issue |
12 |
container_start_page |
2083 |
op_container_end_page |
2096 |
_version_ |
1766361920690978816 |