The effect of temperature on growth performance and aerobic metabolic scope in Arctic charr, Salvelinus alpinus (L.)
In recent years, Arctic char populations in Iceland have declined and the objective of this experiment was to throw further light on these changes by examining the effect of temperature (5, 9, 13, 17, and 21 °C) on the survival, growth rate, metabolism, and physiological indices of juvenile Arctic c...
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ftunivbergen:oai:bora.uib.no:11250/3051504 2023-05-15T14:30:04+02:00 The effect of temperature on growth performance and aerobic metabolic scope in Arctic charr, Salvelinus alpinus (L.) Beuvard, Christian Imsland, Albert Thorarensen, Helgi 2022 application/pdf https://hdl.handle.net/11250/3051504 https://doi.org/10.1016/j.jtherbio.2021.103117 eng eng Elsevier urn:issn:0306-4565 https://hdl.handle.net/11250/3051504 https://doi.org/10.1016/j.jtherbio.2021.103117 cristin:2024280 Journal of Thermal Biology. 2022, 104, 103117. Attribution-NonCommercial-NoDerivatives 4.0 Internasjonal http://creativecommons.org/licenses/by-nc-nd/4.0/deed.no Copyright 2022 Elsevier 103117 Journal of Thermal Biology 104 Journal article Peer reviewed 2022 ftunivbergen https://doi.org/10.1016/j.jtherbio.2021.103117 2023-03-14T17:40:24Z In recent years, Arctic char populations in Iceland have declined and the objective of this experiment was to throw further light on these changes by examining the effect of temperature (5, 9, 13, 17, and 21 °C) on the survival, growth rate, metabolism, and physiological indices of juvenile Arctic charr (initial mean body mass 4.02 ± 0.8 g). Mortality was 60% at 21 °C while at lower temperatures it was below 5%. However, Arctic charr populations in Iceland are declining in locations where the ambient temperature is lower, suggesting that other factors may be more important in determining the abundance of the species. The optimum temperature for growth was near 14 °C. The growth rate was progressively reduced at supra-optimum temperatures with almost no growth at 21 °C. Indicators of energy reserves: condition factor, relative intestinal mass, and hepatosomatic index are all consistent with reduced feed intake at supra-optimum temperatures. The standard and maximum metabolic rate (SMR; MMR), as well as the aerobic scope for activity (AS), were maximum at 13 °C. The routine metabolic rate (RMR) increased exponentially with temperature and, at T21, it was equal to the MMR suggesting, that the RMR was limited by the MMR. Moreover, increased heart- and gill mass at 21 °C are consistent with increased stress on the cardiovascular system. These findings are in keeping with the OCLTT hypothesis that the thermal tolerance of fish is limited by the capacity of the cardiovascular system to deliver oxygen and support metabolism. Taken together, the results of this experiment suggest, that growth rate is reduced at supra-optimum temperatures because of reduced energy intake, increased metabolic demand, and limitations in the capacity of the cardiovascular system to support metabolic rate at high temperatures. At lower temperatures, growth does not appear to be limited by the AS. acceptedVersion Article in Journal/Newspaper Arctic charr Arctic Iceland Salvelinus alpinus University of Bergen: Bergen Open Research Archive (BORA-UiB) Arctic Journal of Thermal Biology 104 103117 |
institution |
Open Polar |
collection |
University of Bergen: Bergen Open Research Archive (BORA-UiB) |
op_collection_id |
ftunivbergen |
language |
English |
description |
In recent years, Arctic char populations in Iceland have declined and the objective of this experiment was to throw further light on these changes by examining the effect of temperature (5, 9, 13, 17, and 21 °C) on the survival, growth rate, metabolism, and physiological indices of juvenile Arctic charr (initial mean body mass 4.02 ± 0.8 g). Mortality was 60% at 21 °C while at lower temperatures it was below 5%. However, Arctic charr populations in Iceland are declining in locations where the ambient temperature is lower, suggesting that other factors may be more important in determining the abundance of the species. The optimum temperature for growth was near 14 °C. The growth rate was progressively reduced at supra-optimum temperatures with almost no growth at 21 °C. Indicators of energy reserves: condition factor, relative intestinal mass, and hepatosomatic index are all consistent with reduced feed intake at supra-optimum temperatures. The standard and maximum metabolic rate (SMR; MMR), as well as the aerobic scope for activity (AS), were maximum at 13 °C. The routine metabolic rate (RMR) increased exponentially with temperature and, at T21, it was equal to the MMR suggesting, that the RMR was limited by the MMR. Moreover, increased heart- and gill mass at 21 °C are consistent with increased stress on the cardiovascular system. These findings are in keeping with the OCLTT hypothesis that the thermal tolerance of fish is limited by the capacity of the cardiovascular system to deliver oxygen and support metabolism. Taken together, the results of this experiment suggest, that growth rate is reduced at supra-optimum temperatures because of reduced energy intake, increased metabolic demand, and limitations in the capacity of the cardiovascular system to support metabolic rate at high temperatures. At lower temperatures, growth does not appear to be limited by the AS. acceptedVersion |
format |
Article in Journal/Newspaper |
author |
Beuvard, Christian Imsland, Albert Thorarensen, Helgi |
spellingShingle |
Beuvard, Christian Imsland, Albert Thorarensen, Helgi The effect of temperature on growth performance and aerobic metabolic scope in Arctic charr, Salvelinus alpinus (L.) |
author_facet |
Beuvard, Christian Imsland, Albert Thorarensen, Helgi |
author_sort |
Beuvard, Christian |
title |
The effect of temperature on growth performance and aerobic metabolic scope in Arctic charr, Salvelinus alpinus (L.) |
title_short |
The effect of temperature on growth performance and aerobic metabolic scope in Arctic charr, Salvelinus alpinus (L.) |
title_full |
The effect of temperature on growth performance and aerobic metabolic scope in Arctic charr, Salvelinus alpinus (L.) |
title_fullStr |
The effect of temperature on growth performance and aerobic metabolic scope in Arctic charr, Salvelinus alpinus (L.) |
title_full_unstemmed |
The effect of temperature on growth performance and aerobic metabolic scope in Arctic charr, Salvelinus alpinus (L.) |
title_sort |
effect of temperature on growth performance and aerobic metabolic scope in arctic charr, salvelinus alpinus (l.) |
publisher |
Elsevier |
publishDate |
2022 |
url |
https://hdl.handle.net/11250/3051504 https://doi.org/10.1016/j.jtherbio.2021.103117 |
geographic |
Arctic |
geographic_facet |
Arctic |
genre |
Arctic charr Arctic Iceland Salvelinus alpinus |
genre_facet |
Arctic charr Arctic Iceland Salvelinus alpinus |
op_source |
103117 Journal of Thermal Biology 104 |
op_relation |
urn:issn:0306-4565 https://hdl.handle.net/11250/3051504 https://doi.org/10.1016/j.jtherbio.2021.103117 cristin:2024280 Journal of Thermal Biology. 2022, 104, 103117. |
op_rights |
Attribution-NonCommercial-NoDerivatives 4.0 Internasjonal http://creativecommons.org/licenses/by-nc-nd/4.0/deed.no Copyright 2022 Elsevier |
op_doi |
https://doi.org/10.1016/j.jtherbio.2021.103117 |
container_title |
Journal of Thermal Biology |
container_volume |
104 |
container_start_page |
103117 |
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1766303990317842432 |