The male sexual stage in salmon parr (Salmo salar L. juv.)
It has long been known that ripe males occur among salmon parr, i.e. in young individuals, up to 15 cm. long, which have never left their native river. One of us (G. M. K.) has seen them frequently during the last 28 years on the Wye, Towy and Dee. These males have mostly been regarded as occasional...
Published in: | Proceedings of the Royal Society of London. Series B - Biological Sciences |
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Format: | Article in Journal/Newspaper |
Language: | English |
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The Royal Society
1938
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Online Access: | http://dx.doi.org/10.1098/rspb.1938.0015 https://royalsocietypublishing.org/doi/pdf/10.1098/rspb.1938.0015 |
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crroyalsociety:10.1098/rspb.1938.0015 2024-06-02T08:14:00+00:00 The male sexual stage in salmon parr (Salmo salar L. juv.) 1938 http://dx.doi.org/10.1098/rspb.1938.0015 https://royalsocietypublishing.org/doi/pdf/10.1098/rspb.1938.0015 en eng The Royal Society https://royalsociety.org/journals/ethics-policies/data-sharing-mining/ Proceedings of the Royal Society of London. Series B - Biological Sciences volume 125, issue 838, page 103-114 ISSN 2053-9193 journal-article 1938 crroyalsociety https://doi.org/10.1098/rspb.1938.0015 2024-05-07T14:16:44Z It has long been known that ripe males occur among salmon parr, i.e. in young individuals, up to 15 cm. long, which have never left their native river. One of us (G. M. K.) has seen them frequently during the last 28 years on the Wye, Towy and Dee. These males have mostly been regarded as occasional precocious males (Calderwood 1930), and there has been no recognition that the male phase may be normal and functional in the fresh water life of salmon before they migrate to the sea. Recently knowledge of these so-called precocious males came to one of us, and in view of the peculiar biology of the salmon it was thought that a male phase might be universal and normal in salmon parr (Orton 1937) and an investigation of the problem was begun. Literature A century ago Shaw (1840) in a paper proving that parr were the fry of salmon also noticed that male parr with ripe milt accompanied adult female spawning salmon. He concluded that the young males might be fertilizing the eggs, and showed by an experiment with milt from a young male parr and ova from an adult salmon that successful fertilizations could be made, and that the progeny became parr like the male parent. Unfertilized controls in a stream of pure water gave no fry. Further, he reared the progeny of this cross and from one young ripe male again fertilized successfully ova from an adult female salmon. Article in Journal/Newspaper Salmo salar The Royal Society Dee ENVELOPE(-59.767,-59.767,-62.433,-62.433) Juv ENVELOPE(20.153,20.153,69.428,69.428) Proceedings of the Royal Society of London. Series B - Biological Sciences 125 838 103 114 |
institution |
Open Polar |
collection |
The Royal Society |
op_collection_id |
crroyalsociety |
language |
English |
description |
It has long been known that ripe males occur among salmon parr, i.e. in young individuals, up to 15 cm. long, which have never left their native river. One of us (G. M. K.) has seen them frequently during the last 28 years on the Wye, Towy and Dee. These males have mostly been regarded as occasional precocious males (Calderwood 1930), and there has been no recognition that the male phase may be normal and functional in the fresh water life of salmon before they migrate to the sea. Recently knowledge of these so-called precocious males came to one of us, and in view of the peculiar biology of the salmon it was thought that a male phase might be universal and normal in salmon parr (Orton 1937) and an investigation of the problem was begun. Literature A century ago Shaw (1840) in a paper proving that parr were the fry of salmon also noticed that male parr with ripe milt accompanied adult female spawning salmon. He concluded that the young males might be fertilizing the eggs, and showed by an experiment with milt from a young male parr and ova from an adult salmon that successful fertilizations could be made, and that the progeny became parr like the male parent. Unfertilized controls in a stream of pure water gave no fry. Further, he reared the progeny of this cross and from one young ripe male again fertilized successfully ova from an adult female salmon. |
format |
Article in Journal/Newspaper |
title |
The male sexual stage in salmon parr (Salmo salar L. juv.) |
spellingShingle |
The male sexual stage in salmon parr (Salmo salar L. juv.) |
title_short |
The male sexual stage in salmon parr (Salmo salar L. juv.) |
title_full |
The male sexual stage in salmon parr (Salmo salar L. juv.) |
title_fullStr |
The male sexual stage in salmon parr (Salmo salar L. juv.) |
title_full_unstemmed |
The male sexual stage in salmon parr (Salmo salar L. juv.) |
title_sort |
male sexual stage in salmon parr (salmo salar l. juv.) |
publisher |
The Royal Society |
publishDate |
1938 |
url |
http://dx.doi.org/10.1098/rspb.1938.0015 https://royalsocietypublishing.org/doi/pdf/10.1098/rspb.1938.0015 |
long_lat |
ENVELOPE(-59.767,-59.767,-62.433,-62.433) ENVELOPE(20.153,20.153,69.428,69.428) |
geographic |
Dee Juv |
geographic_facet |
Dee Juv |
genre |
Salmo salar |
genre_facet |
Salmo salar |
op_source |
Proceedings of the Royal Society of London. Series B - Biological Sciences volume 125, issue 838, page 103-114 ISSN 2053-9193 |
op_rights |
https://royalsociety.org/journals/ethics-policies/data-sharing-mining/ |
op_doi |
https://doi.org/10.1098/rspb.1938.0015 |
container_title |
Proceedings of the Royal Society of London. Series B - Biological Sciences |
container_volume |
125 |
container_issue |
838 |
container_start_page |
103 |
op_container_end_page |
114 |
_version_ |
1800737687100981248 |