Influence of photoperiod on growth in Baltic salmon parr ( Salmo salar L.) with special reference to the effect of precocious sexual maturation
Individually tagged 2-summer-old Baltic salmon parr (Salmo salar L.) from Ume River (63°50′ N, 20°05′ E), Sweden, were exposed to photoperiods of either 6 h light – 18 h dark (LD 6:18) or 20 h light – 4 h dark (LD 20:4) during autumn. Fish subjected to natural day length (nLD) served as controls. Se...
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Canadian Science Publishing
1980
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Online Access: | http://dx.doi.org/10.1139/z80-132 http://www.nrcresearchpress.com/doi/pdf/10.1139/z80-132 |
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crcansciencepubl:10.1139/z80-132 2023-12-17T10:49:24+01:00 Influence of photoperiod on growth in Baltic salmon parr ( Salmo salar L.) with special reference to the effect of precocious sexual maturation Lundqvist, Hans 1980 http://dx.doi.org/10.1139/z80-132 http://www.nrcresearchpress.com/doi/pdf/10.1139/z80-132 en eng Canadian Science Publishing http://www.nrcresearchpress.com/page/about/CorporateTextAndDataMining Canadian Journal of Zoology volume 58, issue 5, page 940-944 ISSN 0008-4301 1480-3283 Animal Science and Zoology Ecology, Evolution, Behavior and Systematics journal-article 1980 crcansciencepubl https://doi.org/10.1139/z80-132 2023-11-19T13:39:23Z Individually tagged 2-summer-old Baltic salmon parr (Salmo salar L.) from Ume River (63°50′ N, 20°05′ E), Sweden, were exposed to photoperiods of either 6 h light – 18 h dark (LD 6:18) or 20 h light – 4 h dark (LD 20:4) during autumn. Fish subjected to natural day length (nLD) served as controls. Sexually immature female and male fish exposed to LD 20:4 grew more rapidly than salmon exposed to LD 6:18 and natural photoperiod. Sexually maturing male parr subjected to LD 20:4 grew more slowly than immature fish in the same photoperiod and did not differ significantly in growth rate compared with maturing males in LD 6:18 and nLD.Precocious male parr subjected to LD 6:18 and nLD became ripe in the middle of October while mature fish in LD 20:4 exhibited a delay in the ripening.It is suggested that either the major androgen 11-ketotestosterone, or gonadotropin (GTH), or both, inhibit photoperiod-stimulated growth in precocious males. Article in Journal/Newspaper Salmo salar Canadian Science Publishing (via Crossref) Canadian Journal of Zoology 58 5 940 944 |
institution |
Open Polar |
collection |
Canadian Science Publishing (via Crossref) |
op_collection_id |
crcansciencepubl |
language |
English |
topic |
Animal Science and Zoology Ecology, Evolution, Behavior and Systematics |
spellingShingle |
Animal Science and Zoology Ecology, Evolution, Behavior and Systematics Lundqvist, Hans Influence of photoperiod on growth in Baltic salmon parr ( Salmo salar L.) with special reference to the effect of precocious sexual maturation |
topic_facet |
Animal Science and Zoology Ecology, Evolution, Behavior and Systematics |
description |
Individually tagged 2-summer-old Baltic salmon parr (Salmo salar L.) from Ume River (63°50′ N, 20°05′ E), Sweden, were exposed to photoperiods of either 6 h light – 18 h dark (LD 6:18) or 20 h light – 4 h dark (LD 20:4) during autumn. Fish subjected to natural day length (nLD) served as controls. Sexually immature female and male fish exposed to LD 20:4 grew more rapidly than salmon exposed to LD 6:18 and natural photoperiod. Sexually maturing male parr subjected to LD 20:4 grew more slowly than immature fish in the same photoperiod and did not differ significantly in growth rate compared with maturing males in LD 6:18 and nLD.Precocious male parr subjected to LD 6:18 and nLD became ripe in the middle of October while mature fish in LD 20:4 exhibited a delay in the ripening.It is suggested that either the major androgen 11-ketotestosterone, or gonadotropin (GTH), or both, inhibit photoperiod-stimulated growth in precocious males. |
format |
Article in Journal/Newspaper |
author |
Lundqvist, Hans |
author_facet |
Lundqvist, Hans |
author_sort |
Lundqvist, Hans |
title |
Influence of photoperiod on growth in Baltic salmon parr ( Salmo salar L.) with special reference to the effect of precocious sexual maturation |
title_short |
Influence of photoperiod on growth in Baltic salmon parr ( Salmo salar L.) with special reference to the effect of precocious sexual maturation |
title_full |
Influence of photoperiod on growth in Baltic salmon parr ( Salmo salar L.) with special reference to the effect of precocious sexual maturation |
title_fullStr |
Influence of photoperiod on growth in Baltic salmon parr ( Salmo salar L.) with special reference to the effect of precocious sexual maturation |
title_full_unstemmed |
Influence of photoperiod on growth in Baltic salmon parr ( Salmo salar L.) with special reference to the effect of precocious sexual maturation |
title_sort |
influence of photoperiod on growth in baltic salmon parr ( salmo salar l.) with special reference to the effect of precocious sexual maturation |
publisher |
Canadian Science Publishing |
publishDate |
1980 |
url |
http://dx.doi.org/10.1139/z80-132 http://www.nrcresearchpress.com/doi/pdf/10.1139/z80-132 |
genre |
Salmo salar |
genre_facet |
Salmo salar |
op_source |
Canadian Journal of Zoology volume 58, issue 5, page 940-944 ISSN 0008-4301 1480-3283 |
op_rights |
http://www.nrcresearchpress.com/page/about/CorporateTextAndDataMining |
op_doi |
https://doi.org/10.1139/z80-132 |
container_title |
Canadian Journal of Zoology |
container_volume |
58 |
container_issue |
5 |
container_start_page |
940 |
op_container_end_page |
944 |
_version_ |
1785573862230982656 |