Photoperiod Control of Parr–Smolt Transformation in Atlantic Salmon ( Salmo salar ): Changes in Salinity Tolerance, Gill Na + ,K + -ATPase Activity, and Plasma Thyroid Hormones
Atlantic salmon (Salmo salar) were subjected to artificial photoperiods to determine the manner and extent of photoperiod control of the parr–smolt transformation. Exposure to continuous light (L24) at first feeding and maintained throughout the rearing period inhibited increases in salinity toleran...
Published in: | Canadian Journal of Fisheries and Aquatic Sciences |
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Canadian Science Publishing
1987
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Online Access: | http://dx.doi.org/10.1139/f87-175 http://www.nrcresearchpress.com/doi/pdf/10.1139/f87-175 |
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crcansciencepubl:10.1139/f87-175 2024-05-12T08:01:17+00:00 Photoperiod Control of Parr–Smolt Transformation in Atlantic Salmon ( Salmo salar ): Changes in Salinity Tolerance, Gill Na + ,K + -ATPase Activity, and Plasma Thyroid Hormones McCormick, Stephen D. Saunders, Richard L. Henderson, Eugene B. Harmon, Paul R. 1987 http://dx.doi.org/10.1139/f87-175 http://www.nrcresearchpress.com/doi/pdf/10.1139/f87-175 en eng Canadian Science Publishing http://www.nrcresearchpress.com/page/about/CorporateTextAndDataMining Canadian Journal of Fisheries and Aquatic Sciences volume 44, issue 8, page 1462-1468 ISSN 0706-652X 1205-7533 Aquatic Science Ecology, Evolution, Behavior and Systematics journal-article 1987 crcansciencepubl https://doi.org/10.1139/f87-175 2024-04-18T06:54:48Z Atlantic salmon (Salmo salar) were subjected to artificial photoperiods to determine the manner and extent of photoperiod control of the parr–smolt transformation. Exposure to continuous light (L24) at first feeding and maintained throughout the rearing period inhibited increases in salinity tolerance and gill Na + ,K + -ATPase activity that occurred in spring in fish raised under simulated natural photoperiod (SNP). Fish reared under continuous light and returned to SNP in October (L24OCT) underwent normal increases in salinity tolerance and gill Na + ,K + -ATPase activity, whereas those returned in December (L24DEC) underwent delayed and intermediate increases. Plasma thyroxine peaks occurred simultaneously in all groups but were diminished in the L24 and L24DEC groups. Plasma 3,5,3′-triiodo-L-thyronine levels were not affected by any photoperiod treatment. Inhibition of the parr–smolt transformation decreased the potential for growth in seawater. In spite of changes in the timing of the transformation induced by photoperiod treatment, salinity tolerance and gill Na + ,K + -ATPase activity were strongly correlated; correlation between changes in salinity tolerance and plasma thyroid hormones were, by comparison, weak. The results demonstrate that continuous light applied early in ontogeny and maintained throughout the rearing period inhibits osmoregulatory changes associated with parr–smolt transformation, whereas increasing day length during winter–spring stimulates transformation. Article in Journal/Newspaper Atlantic salmon Salmo salar Canadian Science Publishing Canadian Journal of Fisheries and Aquatic Sciences 44 8 1462 1468 |
institution |
Open Polar |
collection |
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 McCormick, Stephen D. Saunders, Richard L. Henderson, Eugene B. Harmon, Paul R. Photoperiod Control of Parr–Smolt Transformation in Atlantic Salmon ( Salmo salar ): Changes in Salinity Tolerance, Gill Na + ,K + -ATPase Activity, and Plasma Thyroid Hormones |
topic_facet |
Aquatic Science Ecology, Evolution, Behavior and Systematics |
description |
Atlantic salmon (Salmo salar) were subjected to artificial photoperiods to determine the manner and extent of photoperiod control of the parr–smolt transformation. Exposure to continuous light (L24) at first feeding and maintained throughout the rearing period inhibited increases in salinity tolerance and gill Na + ,K + -ATPase activity that occurred in spring in fish raised under simulated natural photoperiod (SNP). Fish reared under continuous light and returned to SNP in October (L24OCT) underwent normal increases in salinity tolerance and gill Na + ,K + -ATPase activity, whereas those returned in December (L24DEC) underwent delayed and intermediate increases. Plasma thyroxine peaks occurred simultaneously in all groups but were diminished in the L24 and L24DEC groups. Plasma 3,5,3′-triiodo-L-thyronine levels were not affected by any photoperiod treatment. Inhibition of the parr–smolt transformation decreased the potential for growth in seawater. In spite of changes in the timing of the transformation induced by photoperiod treatment, salinity tolerance and gill Na + ,K + -ATPase activity were strongly correlated; correlation between changes in salinity tolerance and plasma thyroid hormones were, by comparison, weak. The results demonstrate that continuous light applied early in ontogeny and maintained throughout the rearing period inhibits osmoregulatory changes associated with parr–smolt transformation, whereas increasing day length during winter–spring stimulates transformation. |
format |
Article in Journal/Newspaper |
author |
McCormick, Stephen D. Saunders, Richard L. Henderson, Eugene B. Harmon, Paul R. |
author_facet |
McCormick, Stephen D. Saunders, Richard L. Henderson, Eugene B. Harmon, Paul R. |
author_sort |
McCormick, Stephen D. |
title |
Photoperiod Control of Parr–Smolt Transformation in Atlantic Salmon ( Salmo salar ): Changes in Salinity Tolerance, Gill Na + ,K + -ATPase Activity, and Plasma Thyroid Hormones |
title_short |
Photoperiod Control of Parr–Smolt Transformation in Atlantic Salmon ( Salmo salar ): Changes in Salinity Tolerance, Gill Na + ,K + -ATPase Activity, and Plasma Thyroid Hormones |
title_full |
Photoperiod Control of Parr–Smolt Transformation in Atlantic Salmon ( Salmo salar ): Changes in Salinity Tolerance, Gill Na + ,K + -ATPase Activity, and Plasma Thyroid Hormones |
title_fullStr |
Photoperiod Control of Parr–Smolt Transformation in Atlantic Salmon ( Salmo salar ): Changes in Salinity Tolerance, Gill Na + ,K + -ATPase Activity, and Plasma Thyroid Hormones |
title_full_unstemmed |
Photoperiod Control of Parr–Smolt Transformation in Atlantic Salmon ( Salmo salar ): Changes in Salinity Tolerance, Gill Na + ,K + -ATPase Activity, and Plasma Thyroid Hormones |
title_sort |
photoperiod control of parr–smolt transformation in atlantic salmon ( salmo salar ): changes in salinity tolerance, gill na + ,k + -atpase activity, and plasma thyroid hormones |
publisher |
Canadian Science Publishing |
publishDate |
1987 |
url |
http://dx.doi.org/10.1139/f87-175 http://www.nrcresearchpress.com/doi/pdf/10.1139/f87-175 |
genre |
Atlantic salmon Salmo salar |
genre_facet |
Atlantic salmon Salmo salar |
op_source |
Canadian Journal of Fisheries and Aquatic Sciences volume 44, issue 8, page 1462-1468 ISSN 0706-652X 1205-7533 |
op_rights |
http://www.nrcresearchpress.com/page/about/CorporateTextAndDataMining |
op_doi |
https://doi.org/10.1139/f87-175 |
container_title |
Canadian Journal of Fisheries and Aquatic Sciences |
container_volume |
44 |
container_issue |
8 |
container_start_page |
1462 |
op_container_end_page |
1468 |
_version_ |
1798843393126694912 |