Development of Hypoosmoregulatory Capacity in Arctic char ( Salvelinus alpinus ) Reared under either Continuous Light or Natural Photoperiod
Two groups of Arctic char (Salvelinus alpinus) were reared in freshwater (5–6 °C) under either continuous light (LDL) from first feeding (March) or LDL until July and then natural photoperiod (NDL, 70°N). Direct transfer to seawater (5.5 °C, 35 ppt) in February resulted in both groups exhibiting inc...
Published in: | Canadian Journal of Fisheries and Aquatic Sciences |
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1992
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Online Access: | http://dx.doi.org/10.1139/f92-027 http://www.nrcresearchpress.com/doi/pdf/10.1139/f92-027 |
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crcansciencepubl:10.1139/f92-027 2024-05-12T07:59:27+00:00 Development of Hypoosmoregulatory Capacity in Arctic char ( Salvelinus alpinus ) Reared under either Continuous Light or Natural Photoperiod Arnesen, Arne M. Halvorsen, Morten Nilssen, Kjell J. 1992 http://dx.doi.org/10.1139/f92-027 http://www.nrcresearchpress.com/doi/pdf/10.1139/f92-027 en eng Canadian Science Publishing http://www.nrcresearchpress.com/page/about/CorporateTextAndDataMining Canadian Journal of Fisheries and Aquatic Sciences volume 49, issue 2, page 229-237 ISSN 0706-652X 1205-7533 Aquatic Science Ecology, Evolution, Behavior and Systematics journal-article 1992 crcansciencepubl https://doi.org/10.1139/f92-027 2024-04-18T06:54:50Z Two groups of Arctic char (Salvelinus alpinus) were reared in freshwater (5–6 °C) under either continuous light (LDL) from first feeding (March) or LDL until July and then natural photoperiod (NDL, 70°N). Direct transfer to seawater (5.5 °C, 35 ppt) in February resulted in both groups exhibiting increases in blood plasma osmolality, Na + , and Mg 2+ concentrations and a significant decrease in muscle water content. When tested in May, an improvement in seawater tolerance was evident in both groups. In June, only the NDL fish showed further improvements in hypoosmoregulatory capacity, since they exhibited only minor fluctuations in plasma constituents and muscle water content following direct transfer to seawater. Increased body size could partially explain the improved seawater tolerance in the experimental groups. Acclimation to brackish water prior to transfer to 35 ppt seawater in June improved seawater tolerance only in fish reared under continuous light. The results indicate that the seasonal increase in photoperiod stimulates the development of hypoosmoregulatory capacity whilst the fish are still resident in freshwater. Article in Journal/Newspaper Arctic Salvelinus alpinus Canadian Science Publishing Arctic Canadian Journal of Fisheries and Aquatic Sciences 49 2 229 237 |
institution |
Open Polar |
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Canadian Science Publishing |
op_collection_id |
crcansciencepubl |
language |
English |
topic |
Aquatic Science Ecology, Evolution, Behavior and Systematics |
spellingShingle |
Aquatic Science Ecology, Evolution, Behavior and Systematics Arnesen, Arne M. Halvorsen, Morten Nilssen, Kjell J. Development of Hypoosmoregulatory Capacity in Arctic char ( Salvelinus alpinus ) Reared under either Continuous Light or Natural Photoperiod |
topic_facet |
Aquatic Science Ecology, Evolution, Behavior and Systematics |
description |
Two groups of Arctic char (Salvelinus alpinus) were reared in freshwater (5–6 °C) under either continuous light (LDL) from first feeding (March) or LDL until July and then natural photoperiod (NDL, 70°N). Direct transfer to seawater (5.5 °C, 35 ppt) in February resulted in both groups exhibiting increases in blood plasma osmolality, Na + , and Mg 2+ concentrations and a significant decrease in muscle water content. When tested in May, an improvement in seawater tolerance was evident in both groups. In June, only the NDL fish showed further improvements in hypoosmoregulatory capacity, since they exhibited only minor fluctuations in plasma constituents and muscle water content following direct transfer to seawater. Increased body size could partially explain the improved seawater tolerance in the experimental groups. Acclimation to brackish water prior to transfer to 35 ppt seawater in June improved seawater tolerance only in fish reared under continuous light. The results indicate that the seasonal increase in photoperiod stimulates the development of hypoosmoregulatory capacity whilst the fish are still resident in freshwater. |
format |
Article in Journal/Newspaper |
author |
Arnesen, Arne M. Halvorsen, Morten Nilssen, Kjell J. |
author_facet |
Arnesen, Arne M. Halvorsen, Morten Nilssen, Kjell J. |
author_sort |
Arnesen, Arne M. |
title |
Development of Hypoosmoregulatory Capacity in Arctic char ( Salvelinus alpinus ) Reared under either Continuous Light or Natural Photoperiod |
title_short |
Development of Hypoosmoregulatory Capacity in Arctic char ( Salvelinus alpinus ) Reared under either Continuous Light or Natural Photoperiod |
title_full |
Development of Hypoosmoregulatory Capacity in Arctic char ( Salvelinus alpinus ) Reared under either Continuous Light or Natural Photoperiod |
title_fullStr |
Development of Hypoosmoregulatory Capacity in Arctic char ( Salvelinus alpinus ) Reared under either Continuous Light or Natural Photoperiod |
title_full_unstemmed |
Development of Hypoosmoregulatory Capacity in Arctic char ( Salvelinus alpinus ) Reared under either Continuous Light or Natural Photoperiod |
title_sort |
development of hypoosmoregulatory capacity in arctic char ( salvelinus alpinus ) reared under either continuous light or natural photoperiod |
publisher |
Canadian Science Publishing |
publishDate |
1992 |
url |
http://dx.doi.org/10.1139/f92-027 http://www.nrcresearchpress.com/doi/pdf/10.1139/f92-027 |
geographic |
Arctic |
geographic_facet |
Arctic |
genre |
Arctic Salvelinus alpinus |
genre_facet |
Arctic Salvelinus alpinus |
op_source |
Canadian Journal of Fisheries and Aquatic Sciences volume 49, issue 2, page 229-237 ISSN 0706-652X 1205-7533 |
op_rights |
http://www.nrcresearchpress.com/page/about/CorporateTextAndDataMining |
op_doi |
https://doi.org/10.1139/f92-027 |
container_title |
Canadian Journal of Fisheries and Aquatic Sciences |
container_volume |
49 |
container_issue |
2 |
container_start_page |
229 |
op_container_end_page |
237 |
_version_ |
1798840795022753792 |