Resmoltification in wild, anadromous Arctic char ( Salvelinus alpinus ): a survey of osmoregulatory, metabolic, and endocrine changes preceding annual seawater migration
Anadromous Arctic char (Salvelinus alpinus) migrate to seawater every summer for feeding and spend the rest of the year overwintering in fresh water. We investigated whether annual seawater migration is preceded by changes in hyposmoregulatory capacity, intermediary metabolism, and the plasma levels...
Published in: | Canadian Journal of Fisheries and Aquatic Sciences |
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Online Access: | http://dx.doi.org/10.1139/f04-186 http://www.nrcresearchpress.com/doi/pdf/10.1139/f04-186 |
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crcansciencepubl:10.1139/f04-186 2024-05-12T07:58:57+00:00 Resmoltification in wild, anadromous Arctic char ( Salvelinus alpinus ): a survey of osmoregulatory, metabolic, and endocrine changes preceding annual seawater migration Aas-Hansen, Øyvind Vijayan, Mathilakath M Johnsen, Helge K Cameron, Colin Jørgensen, Even H 2005 http://dx.doi.org/10.1139/f04-186 http://www.nrcresearchpress.com/doi/pdf/10.1139/f04-186 en eng Canadian Science Publishing http://www.nrcresearchpress.com/page/about/CorporateTextAndDataMining Canadian Journal of Fisheries and Aquatic Sciences volume 62, issue 1, page 195-204 ISSN 0706-652X 1205-7533 Aquatic Science Ecology, Evolution, Behavior and Systematics journal-article 2005 crcansciencepubl https://doi.org/10.1139/f04-186 2024-04-18T06:54:52Z Anadromous Arctic char (Salvelinus alpinus) migrate to seawater every summer for feeding and spend the rest of the year overwintering in fresh water. We investigated whether annual seawater migration is preceded by changes in hyposmoregulatory capacity, intermediary metabolism, and the plasma levels of hormones known to play a role in salmonid seawater preadaptation (smoltification). Wild, anadromous Arctic char were sampled in their overwintering lake in April and May and during the period of downstream migration in June. Our results demonstrate a fourfold seasonal increase in gill Na + /K + ATPase activity, with maximum levels in descending migrants that also displayed prime hyposmoregulatory capacity. Hepatosomatic index and activities of key liver enzymes also increased during spring, indicating a general increase in liver metabolic capacity. These changes were accompanied by increased plasma cortisol and thyroxine levels, decreased plasma growth hormone levels, and unchanged plasma levels of insulin-like growth factor-I and 3,5,3′-triiodothyronine. Our results indicate that wild, anadromous Arctic char resmoltify every spring, and this involves a shift from an energy-conserving overwintering state to a state where they become osmotically and metabolically prepared for their annual feeding migration to seawater. Article in Journal/Newspaper Arctic Salvelinus alpinus Canadian Science Publishing Arctic Canadian Journal of Fisheries and Aquatic Sciences 62 1 195 204 |
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 Aas-Hansen, Øyvind Vijayan, Mathilakath M Johnsen, Helge K Cameron, Colin Jørgensen, Even H Resmoltification in wild, anadromous Arctic char ( Salvelinus alpinus ): a survey of osmoregulatory, metabolic, and endocrine changes preceding annual seawater migration |
topic_facet |
Aquatic Science Ecology, Evolution, Behavior and Systematics |
description |
Anadromous Arctic char (Salvelinus alpinus) migrate to seawater every summer for feeding and spend the rest of the year overwintering in fresh water. We investigated whether annual seawater migration is preceded by changes in hyposmoregulatory capacity, intermediary metabolism, and the plasma levels of hormones known to play a role in salmonid seawater preadaptation (smoltification). Wild, anadromous Arctic char were sampled in their overwintering lake in April and May and during the period of downstream migration in June. Our results demonstrate a fourfold seasonal increase in gill Na + /K + ATPase activity, with maximum levels in descending migrants that also displayed prime hyposmoregulatory capacity. Hepatosomatic index and activities of key liver enzymes also increased during spring, indicating a general increase in liver metabolic capacity. These changes were accompanied by increased plasma cortisol and thyroxine levels, decreased plasma growth hormone levels, and unchanged plasma levels of insulin-like growth factor-I and 3,5,3′-triiodothyronine. Our results indicate that wild, anadromous Arctic char resmoltify every spring, and this involves a shift from an energy-conserving overwintering state to a state where they become osmotically and metabolically prepared for their annual feeding migration to seawater. |
format |
Article in Journal/Newspaper |
author |
Aas-Hansen, Øyvind Vijayan, Mathilakath M Johnsen, Helge K Cameron, Colin Jørgensen, Even H |
author_facet |
Aas-Hansen, Øyvind Vijayan, Mathilakath M Johnsen, Helge K Cameron, Colin Jørgensen, Even H |
author_sort |
Aas-Hansen, Øyvind |
title |
Resmoltification in wild, anadromous Arctic char ( Salvelinus alpinus ): a survey of osmoregulatory, metabolic, and endocrine changes preceding annual seawater migration |
title_short |
Resmoltification in wild, anadromous Arctic char ( Salvelinus alpinus ): a survey of osmoregulatory, metabolic, and endocrine changes preceding annual seawater migration |
title_full |
Resmoltification in wild, anadromous Arctic char ( Salvelinus alpinus ): a survey of osmoregulatory, metabolic, and endocrine changes preceding annual seawater migration |
title_fullStr |
Resmoltification in wild, anadromous Arctic char ( Salvelinus alpinus ): a survey of osmoregulatory, metabolic, and endocrine changes preceding annual seawater migration |
title_full_unstemmed |
Resmoltification in wild, anadromous Arctic char ( Salvelinus alpinus ): a survey of osmoregulatory, metabolic, and endocrine changes preceding annual seawater migration |
title_sort |
resmoltification in wild, anadromous arctic char ( salvelinus alpinus ): a survey of osmoregulatory, metabolic, and endocrine changes preceding annual seawater migration |
publisher |
Canadian Science Publishing |
publishDate |
2005 |
url |
http://dx.doi.org/10.1139/f04-186 http://www.nrcresearchpress.com/doi/pdf/10.1139/f04-186 |
geographic |
Arctic |
geographic_facet |
Arctic |
genre |
Arctic Salvelinus alpinus |
genre_facet |
Arctic Salvelinus alpinus |
op_source |
Canadian Journal of Fisheries and Aquatic Sciences volume 62, issue 1, page 195-204 ISSN 0706-652X 1205-7533 |
op_rights |
http://www.nrcresearchpress.com/page/about/CorporateTextAndDataMining |
op_doi |
https://doi.org/10.1139/f04-186 |
container_title |
Canadian Journal of Fisheries and Aquatic Sciences |
container_volume |
62 |
container_issue |
1 |
container_start_page |
195 |
op_container_end_page |
204 |
_version_ |
1798839625000681472 |