Precocious Male Atlantic Salmon Parr ( Salmo salar ) in Insular Newfoundland
The incidence of sexual precocity in male Atlantic salmon parr (Salmo salar) was examined in selected rivers in insular Newfoundland from 1974 to 1977. The incidence was variable but generally high, particularly in eastern rivers. Examination of age-specific lengths revealed that the faster growing...
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Canadian Science Publishing
1983
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Online Access: | http://dx.doi.org/10.1139/f83-086 http://www.nrcresearchpress.com/doi/pdf/10.1139/f83-086 |
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crcansciencepubl:10.1139/f83-086 2024-04-28T08:13:25+00:00 Precocious Male Atlantic Salmon Parr ( Salmo salar ) in Insular Newfoundland Dalley, E. L. Andrews, C. W. Green, J. M. 1983 http://dx.doi.org/10.1139/f83-086 http://www.nrcresearchpress.com/doi/pdf/10.1139/f83-086 en eng Canadian Science Publishing http://www.nrcresearchpress.com/page/about/CorporateTextAndDataMining Canadian Journal of Fisheries and Aquatic Sciences volume 40, issue 5, page 647-652 ISSN 0706-652X 1205-7533 Aquatic Science Ecology, Evolution, Behavior and Systematics journal-article 1983 crcansciencepubl https://doi.org/10.1139/f83-086 2024-04-09T06:56:27Z The incidence of sexual precocity in male Atlantic salmon parr (Salmo salar) was examined in selected rivers in insular Newfoundland from 1974 to 1977. The incidence was variable but generally high, particularly in eastern rivers. Examination of age-specific lengths revealed that the faster growing males became precocious but percent precocity for these varied among river systems. Precocity did not influence growth of parr in comparison to immatures up to the smolt stage. No difference was found in the condition (using gutted weights) of mature and immature parr. However, condition deteriorated in precocious fish compared to immature fish with smoltification. Parr sex ratios frequently differed significantly from 1:1. Possible reasons are discussed in terms of sex related distribution patterns and mortality of precocious parr. From smolt runs examined, it appears that too few precocious parr migrate as smolt to contribute to the grilse population. As a result of the high mortality, rivers with a high percentage of sexually precocious males tend to have a corresponding high percentage of adult females. Article in Journal/Newspaper Atlantic salmon Newfoundland Salmo salar Canadian Science Publishing Canadian Journal of Fisheries and Aquatic Sciences 40 5 647 652 |
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Open Polar |
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Canadian Science Publishing |
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crcansciencepubl |
language |
English |
topic |
Aquatic Science Ecology, Evolution, Behavior and Systematics |
spellingShingle |
Aquatic Science Ecology, Evolution, Behavior and Systematics Dalley, E. L. Andrews, C. W. Green, J. M. Precocious Male Atlantic Salmon Parr ( Salmo salar ) in Insular Newfoundland |
topic_facet |
Aquatic Science Ecology, Evolution, Behavior and Systematics |
description |
The incidence of sexual precocity in male Atlantic salmon parr (Salmo salar) was examined in selected rivers in insular Newfoundland from 1974 to 1977. The incidence was variable but generally high, particularly in eastern rivers. Examination of age-specific lengths revealed that the faster growing males became precocious but percent precocity for these varied among river systems. Precocity did not influence growth of parr in comparison to immatures up to the smolt stage. No difference was found in the condition (using gutted weights) of mature and immature parr. However, condition deteriorated in precocious fish compared to immature fish with smoltification. Parr sex ratios frequently differed significantly from 1:1. Possible reasons are discussed in terms of sex related distribution patterns and mortality of precocious parr. From smolt runs examined, it appears that too few precocious parr migrate as smolt to contribute to the grilse population. As a result of the high mortality, rivers with a high percentage of sexually precocious males tend to have a corresponding high percentage of adult females. |
format |
Article in Journal/Newspaper |
author |
Dalley, E. L. Andrews, C. W. Green, J. M. |
author_facet |
Dalley, E. L. Andrews, C. W. Green, J. M. |
author_sort |
Dalley, E. L. |
title |
Precocious Male Atlantic Salmon Parr ( Salmo salar ) in Insular Newfoundland |
title_short |
Precocious Male Atlantic Salmon Parr ( Salmo salar ) in Insular Newfoundland |
title_full |
Precocious Male Atlantic Salmon Parr ( Salmo salar ) in Insular Newfoundland |
title_fullStr |
Precocious Male Atlantic Salmon Parr ( Salmo salar ) in Insular Newfoundland |
title_full_unstemmed |
Precocious Male Atlantic Salmon Parr ( Salmo salar ) in Insular Newfoundland |
title_sort |
precocious male atlantic salmon parr ( salmo salar ) in insular newfoundland |
publisher |
Canadian Science Publishing |
publishDate |
1983 |
url |
http://dx.doi.org/10.1139/f83-086 http://www.nrcresearchpress.com/doi/pdf/10.1139/f83-086 |
genre |
Atlantic salmon Newfoundland Salmo salar |
genre_facet |
Atlantic salmon Newfoundland Salmo salar |
op_source |
Canadian Journal of Fisheries and Aquatic Sciences volume 40, issue 5, page 647-652 ISSN 0706-652X 1205-7533 |
op_rights |
http://www.nrcresearchpress.com/page/about/CorporateTextAndDataMining |
op_doi |
https://doi.org/10.1139/f83-086 |
container_title |
Canadian Journal of Fisheries and Aquatic Sciences |
container_volume |
40 |
container_issue |
5 |
container_start_page |
647 |
op_container_end_page |
652 |
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1797579930015367168 |