Growth, Parr–Smolt Transformation, and Changes in Growth Hormone of Atlantic Salmon ( Salmo salar) Reared under Different Photoperiods
Potential 1+ smolts of Atlantic salmon (Salmo salar) were reared under three light regimes: simulated natural photoperiod (LDN), continuous light (LD24:0), or a combination of continuous, low-intensity background light and a superimposed simulated natural photoperiod (dual photoperiod, LDD). Growth...
Published in: | Canadian Journal of Fisheries and Aquatic Sciences |
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Canadian Science Publishing
1991
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Online Access: | http://dx.doi.org/10.1139/f91-249 http://www.nrcresearchpress.com/doi/pdf/10.1139/f91-249 |
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crcansciencepubl:10.1139/f91-249 2024-09-15T17:55:59+00:00 Growth, Parr–Smolt Transformation, and Changes in Growth Hormone of Atlantic Salmon ( Salmo salar) Reared under Different Photoperiods Stefansson, Sigurd O. Bjömsson, Björn Th. Hansen, Tom Haux, Carl Taranger, G. Lasse Saunders, Richard L. 1991 http://dx.doi.org/10.1139/f91-249 http://www.nrcresearchpress.com/doi/pdf/10.1139/f91-249 en eng Canadian Science Publishing http://www.nrcresearchpress.com/page/about/CorporateTextAndDataMining Canadian Journal of Fisheries and Aquatic Sciences volume 48, issue 11, page 2100-2108 ISSN 0706-652X 1205-7533 journal-article 1991 crcansciencepubl https://doi.org/10.1139/f91-249 2024-08-08T04:13:35Z Potential 1+ smolts of Atlantic salmon (Salmo salar) were reared under three light regimes: simulated natural photoperiod (LDN), continuous light (LD24:0), or a combination of continuous, low-intensity background light and a superimposed simulated natural photoperiod (dual photoperiod, LDD). Growth rate in freshwater was enhanced by LD24:0 and LDD, and changes associated with smoking (increased salinity tolerance, reduced condition coefficient) were advanced under LD24:0. Plasma growth hormone levels were initially high on LD24:0 and LDD whereas on LDN, plasma growth hormone levels increased gradually from February through April. Overall GH levels were negatively correlated with condition coefficient during the final stages of smoking. After 16 mo in seawater, there were no significant size differences among the groups. The incidence of sexual maturation as postsmolts was higher in the LD24:0 and LDD groups whereas the incidence of grilsing was higher in LDN. Results demonstrate the significant influence of photoperiod on growth and smoking in Atlantic salmon. An abrupt increase to continuous light in winter may be sufficient to advance important aspects of the parr–smolt transformation. Dual photoperiod may be a way to combine the increased growth rate observed under continuous light and the normal parr–smolt transformation associated with natural photoperiod. Article in Journal/Newspaper Atlantic salmon Salmo salar Canadian Science Publishing Canadian Journal of Fisheries and Aquatic Sciences 48 11 2100 2108 |
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Canadian Science Publishing |
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crcansciencepubl |
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English |
description |
Potential 1+ smolts of Atlantic salmon (Salmo salar) were reared under three light regimes: simulated natural photoperiod (LDN), continuous light (LD24:0), or a combination of continuous, low-intensity background light and a superimposed simulated natural photoperiod (dual photoperiod, LDD). Growth rate in freshwater was enhanced by LD24:0 and LDD, and changes associated with smoking (increased salinity tolerance, reduced condition coefficient) were advanced under LD24:0. Plasma growth hormone levels were initially high on LD24:0 and LDD whereas on LDN, plasma growth hormone levels increased gradually from February through April. Overall GH levels were negatively correlated with condition coefficient during the final stages of smoking. After 16 mo in seawater, there were no significant size differences among the groups. The incidence of sexual maturation as postsmolts was higher in the LD24:0 and LDD groups whereas the incidence of grilsing was higher in LDN. Results demonstrate the significant influence of photoperiod on growth and smoking in Atlantic salmon. An abrupt increase to continuous light in winter may be sufficient to advance important aspects of the parr–smolt transformation. Dual photoperiod may be a way to combine the increased growth rate observed under continuous light and the normal parr–smolt transformation associated with natural photoperiod. |
format |
Article in Journal/Newspaper |
author |
Stefansson, Sigurd O. Bjömsson, Björn Th. Hansen, Tom Haux, Carl Taranger, G. Lasse Saunders, Richard L. |
spellingShingle |
Stefansson, Sigurd O. Bjömsson, Björn Th. Hansen, Tom Haux, Carl Taranger, G. Lasse Saunders, Richard L. Growth, Parr–Smolt Transformation, and Changes in Growth Hormone of Atlantic Salmon ( Salmo salar) Reared under Different Photoperiods |
author_facet |
Stefansson, Sigurd O. Bjömsson, Björn Th. Hansen, Tom Haux, Carl Taranger, G. Lasse Saunders, Richard L. |
author_sort |
Stefansson, Sigurd O. |
title |
Growth, Parr–Smolt Transformation, and Changes in Growth Hormone of Atlantic Salmon ( Salmo salar) Reared under Different Photoperiods |
title_short |
Growth, Parr–Smolt Transformation, and Changes in Growth Hormone of Atlantic Salmon ( Salmo salar) Reared under Different Photoperiods |
title_full |
Growth, Parr–Smolt Transformation, and Changes in Growth Hormone of Atlantic Salmon ( Salmo salar) Reared under Different Photoperiods |
title_fullStr |
Growth, Parr–Smolt Transformation, and Changes in Growth Hormone of Atlantic Salmon ( Salmo salar) Reared under Different Photoperiods |
title_full_unstemmed |
Growth, Parr–Smolt Transformation, and Changes in Growth Hormone of Atlantic Salmon ( Salmo salar) Reared under Different Photoperiods |
title_sort |
growth, parr–smolt transformation, and changes in growth hormone of atlantic salmon ( salmo salar) reared under different photoperiods |
publisher |
Canadian Science Publishing |
publishDate |
1991 |
url |
http://dx.doi.org/10.1139/f91-249 http://www.nrcresearchpress.com/doi/pdf/10.1139/f91-249 |
genre |
Atlantic salmon Salmo salar |
genre_facet |
Atlantic salmon Salmo salar |
op_source |
Canadian Journal of Fisheries and Aquatic Sciences volume 48, issue 11, page 2100-2108 ISSN 0706-652X 1205-7533 |
op_rights |
http://www.nrcresearchpress.com/page/about/CorporateTextAndDataMining |
op_doi |
https://doi.org/10.1139/f91-249 |
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Canadian Journal of Fisheries and Aquatic Sciences |
container_volume |
48 |
container_issue |
11 |
container_start_page |
2100 |
op_container_end_page |
2108 |
_version_ |
1810432203651284992 |