The effect of continuous light at low temperatures on growth in Atlantic salmon reared in commercial size sea pens
The aim of this study was to investigate the effect of continuous light of different duration, applied from late autumn to spring in the second year of the production cycle, on the production performance of Atlantic salmon in Northern Norway. The underlying hypothesis is that the introduction of con...
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Online Access: | https://hdl.handle.net/1956/17024 https://doi.org/10.1016/j.aquaculture.2017.07.014 |
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ftunivbergen:oai:bora.uib.no:1956/17024 2023-05-15T15:31:27+02:00 The effect of continuous light at low temperatures on growth in Atlantic salmon reared in commercial size sea pens Imsland, Albert Roth, Bjørn Fjelldal, Per Gunnar Stefansson, Sigurd Olav Handeland, Sigurd Olav Mikalsen, Bjørn 2017-11-10T07:27:45Z application/pdf https://hdl.handle.net/1956/17024 https://doi.org/10.1016/j.aquaculture.2017.07.014 eng eng Elsevier Norges forskningsråd: 226059 urn:issn:1873-5622 urn:issn:0044-8486 https://hdl.handle.net/1956/17024 https://doi.org/10.1016/j.aquaculture.2017.07.014 cristin:1493479 Copyright 2017 Elsevier B.V. All rights reserved. Aquaculture Salmon Temperature Photoperiod Growth Vertebra morphology Peer reviewed Journal article 2017 ftunivbergen https://doi.org/10.1016/j.aquaculture.2017.07.014 2023-03-14T17:44:32Z The aim of this study was to investigate the effect of continuous light of different duration, applied from late autumn to spring in the second year of the production cycle, on the production performance of Atlantic salmon in Northern Norway. The underlying hypothesis is that the introduction of continuous light (LL) superimposed on the natural light before December (the preferred continuous light regime in Northern Norway) could enhance growth and inhibit maturation in the subsequent year. To test this, two large, commercial scale experiments were performed [Experiment 1 in 2014 at 69.47°N, 18.26°E, and Experiment 2 in 2015 at 69.80°N, 19.42°E] where salmon of initial size of 1–1.5 kg were subjected to LL at different time points during the period between 11 November and 13 December, and reared under LL until 31 March the following year. In Experiment 1 the water temperature at 6 m depth ranged between 6.7 °C in November and 3.6 °C in March and in Experiment 2 the water temperature at 6 m depth ranged between 8.3 °C in November and 3.6 °C in March and 6.8 °C in May 2016. Before and after the period with LL, all fish were reared under natural light. Growth was improved by 13–20% in the early exposed groups (15 Nov and 11 Nov) compared to the late exposed groups (13 Dec.). No maturation was seen in the experimental groups at slaughter (Exp. 1: July–September 2015, Exp. 2: May 2016). Vertebra deformities did not differ between the early and late exposed groups suggesting that continuous light promotes growth at lower temperatures, while supporting normal vertebra development. Only minor differences in flesh texture (measured as differences in cathepsin L + B activity) were found in both experiments. It is concluded that a considerable growth benefit may be achieved by exposing Atlantic salmon to continuous light from early November in their first year in seawater, i.e. one month earlier than presently used by the salmon farming industry in Northern Norway. acceptedVersion Article in Journal/Newspaper Atlantic salmon Northern Norway University of Bergen: Bergen Open Research Archive (BORA-UiB) Norway Slaughter ENVELOPE(-85.633,-85.633,-78.617,-78.617) Aquaculture 479 645 651 |
institution |
Open Polar |
collection |
University of Bergen: Bergen Open Research Archive (BORA-UiB) |
op_collection_id |
ftunivbergen |
language |
English |
topic |
Salmon Temperature Photoperiod Growth Vertebra morphology |
spellingShingle |
Salmon Temperature Photoperiod Growth Vertebra morphology Imsland, Albert Roth, Bjørn Fjelldal, Per Gunnar Stefansson, Sigurd Olav Handeland, Sigurd Olav Mikalsen, Bjørn The effect of continuous light at low temperatures on growth in Atlantic salmon reared in commercial size sea pens |
topic_facet |
Salmon Temperature Photoperiod Growth Vertebra morphology |
description |
The aim of this study was to investigate the effect of continuous light of different duration, applied from late autumn to spring in the second year of the production cycle, on the production performance of Atlantic salmon in Northern Norway. The underlying hypothesis is that the introduction of continuous light (LL) superimposed on the natural light before December (the preferred continuous light regime in Northern Norway) could enhance growth and inhibit maturation in the subsequent year. To test this, two large, commercial scale experiments were performed [Experiment 1 in 2014 at 69.47°N, 18.26°E, and Experiment 2 in 2015 at 69.80°N, 19.42°E] where salmon of initial size of 1–1.5 kg were subjected to LL at different time points during the period between 11 November and 13 December, and reared under LL until 31 March the following year. In Experiment 1 the water temperature at 6 m depth ranged between 6.7 °C in November and 3.6 °C in March and in Experiment 2 the water temperature at 6 m depth ranged between 8.3 °C in November and 3.6 °C in March and 6.8 °C in May 2016. Before and after the period with LL, all fish were reared under natural light. Growth was improved by 13–20% in the early exposed groups (15 Nov and 11 Nov) compared to the late exposed groups (13 Dec.). No maturation was seen in the experimental groups at slaughter (Exp. 1: July–September 2015, Exp. 2: May 2016). Vertebra deformities did not differ between the early and late exposed groups suggesting that continuous light promotes growth at lower temperatures, while supporting normal vertebra development. Only minor differences in flesh texture (measured as differences in cathepsin L + B activity) were found in both experiments. It is concluded that a considerable growth benefit may be achieved by exposing Atlantic salmon to continuous light from early November in their first year in seawater, i.e. one month earlier than presently used by the salmon farming industry in Northern Norway. acceptedVersion |
format |
Article in Journal/Newspaper |
author |
Imsland, Albert Roth, Bjørn Fjelldal, Per Gunnar Stefansson, Sigurd Olav Handeland, Sigurd Olav Mikalsen, Bjørn |
author_facet |
Imsland, Albert Roth, Bjørn Fjelldal, Per Gunnar Stefansson, Sigurd Olav Handeland, Sigurd Olav Mikalsen, Bjørn |
author_sort |
Imsland, Albert |
title |
The effect of continuous light at low temperatures on growth in Atlantic salmon reared in commercial size sea pens |
title_short |
The effect of continuous light at low temperatures on growth in Atlantic salmon reared in commercial size sea pens |
title_full |
The effect of continuous light at low temperatures on growth in Atlantic salmon reared in commercial size sea pens |
title_fullStr |
The effect of continuous light at low temperatures on growth in Atlantic salmon reared in commercial size sea pens |
title_full_unstemmed |
The effect of continuous light at low temperatures on growth in Atlantic salmon reared in commercial size sea pens |
title_sort |
effect of continuous light at low temperatures on growth in atlantic salmon reared in commercial size sea pens |
publisher |
Elsevier |
publishDate |
2017 |
url |
https://hdl.handle.net/1956/17024 https://doi.org/10.1016/j.aquaculture.2017.07.014 |
long_lat |
ENVELOPE(-85.633,-85.633,-78.617,-78.617) |
geographic |
Norway Slaughter |
geographic_facet |
Norway Slaughter |
genre |
Atlantic salmon Northern Norway |
genre_facet |
Atlantic salmon Northern Norway |
op_source |
Aquaculture |
op_relation |
Norges forskningsråd: 226059 urn:issn:1873-5622 urn:issn:0044-8486 https://hdl.handle.net/1956/17024 https://doi.org/10.1016/j.aquaculture.2017.07.014 cristin:1493479 |
op_rights |
Copyright 2017 Elsevier B.V. All rights reserved. |
op_doi |
https://doi.org/10.1016/j.aquaculture.2017.07.014 |
container_title |
Aquaculture |
container_volume |
479 |
container_start_page |
645 |
op_container_end_page |
651 |
_version_ |
1766361962347757568 |