Annulus Development on the Second Dorsal Spine of the Spiny Dogfish ( Squalus acanthias ) and Its Validity for Age Determination
Annual marks were visible in three different areas of the dogfish (Squalus acanthias) spine. The annuli in the mantle, the stem base, and the inner dentine develop independently of each other. Annuli that formed on the mantle were readily identifiable externally, making them the most useful for age...
Published in: | Canadian Journal of Fisheries and Aquatic Sciences |
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Language: | English |
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Canadian Science Publishing
1985
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Online Access: | http://dx.doi.org/10.1139/f85-225 http://www.nrcresearchpress.com/doi/pdf/10.1139/f85-225 |
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crcansciencepubl:10.1139/f85-225 2023-12-17T10:51:45+01:00 Annulus Development on the Second Dorsal Spine of the Spiny Dogfish ( Squalus acanthias ) and Its Validity for Age Determination Beamish, Richard J. McFarlane, Gordon A. 1985 http://dx.doi.org/10.1139/f85-225 http://www.nrcresearchpress.com/doi/pdf/10.1139/f85-225 en eng Canadian Science Publishing http://www.nrcresearchpress.com/page/about/CorporateTextAndDataMining Canadian Journal of Fisheries and Aquatic Sciences volume 42, issue 11, page 1799-1805 ISSN 0706-652X 1205-7533 Aquatic Science Ecology, Evolution, Behavior and Systematics journal-article 1985 crcansciencepubl https://doi.org/10.1139/f85-225 2023-11-19T13:39:10Z Annual marks were visible in three different areas of the dogfish (Squalus acanthias) spine. The annuli in the mantle, the stem base, and the inner dentine develop independently of each other. Annuli that formed on the mantle were readily identifiable externally, making them the most useful for age determination. The mantle annulus is an accumulation of pigment that appears to form because enamel deposition is not synchronous with the upward growth of the spine, resulting in the production of darkened bands that often form ridges. We validated our interpretation of annuli from fish aged 20–70 yr by tagging and recovering dogfish that were injected with oxytetracycline. Through validation we were able to demonstrate that some previous studies have underestimated age, resulting in a misunderstanding of important life history parameters. Article in Journal/Newspaper spiny dogfish Squalus acanthias Canadian Science Publishing (via Crossref) Canadian Journal of Fisheries and Aquatic Sciences 42 11 1799 1805 |
institution |
Open Polar |
collection |
Canadian Science Publishing (via Crossref) |
op_collection_id |
crcansciencepubl |
language |
English |
topic |
Aquatic Science Ecology, Evolution, Behavior and Systematics |
spellingShingle |
Aquatic Science Ecology, Evolution, Behavior and Systematics Beamish, Richard J. McFarlane, Gordon A. Annulus Development on the Second Dorsal Spine of the Spiny Dogfish ( Squalus acanthias ) and Its Validity for Age Determination |
topic_facet |
Aquatic Science Ecology, Evolution, Behavior and Systematics |
description |
Annual marks were visible in three different areas of the dogfish (Squalus acanthias) spine. The annuli in the mantle, the stem base, and the inner dentine develop independently of each other. Annuli that formed on the mantle were readily identifiable externally, making them the most useful for age determination. The mantle annulus is an accumulation of pigment that appears to form because enamel deposition is not synchronous with the upward growth of the spine, resulting in the production of darkened bands that often form ridges. We validated our interpretation of annuli from fish aged 20–70 yr by tagging and recovering dogfish that were injected with oxytetracycline. Through validation we were able to demonstrate that some previous studies have underestimated age, resulting in a misunderstanding of important life history parameters. |
format |
Article in Journal/Newspaper |
author |
Beamish, Richard J. McFarlane, Gordon A. |
author_facet |
Beamish, Richard J. McFarlane, Gordon A. |
author_sort |
Beamish, Richard J. |
title |
Annulus Development on the Second Dorsal Spine of the Spiny Dogfish ( Squalus acanthias ) and Its Validity for Age Determination |
title_short |
Annulus Development on the Second Dorsal Spine of the Spiny Dogfish ( Squalus acanthias ) and Its Validity for Age Determination |
title_full |
Annulus Development on the Second Dorsal Spine of the Spiny Dogfish ( Squalus acanthias ) and Its Validity for Age Determination |
title_fullStr |
Annulus Development on the Second Dorsal Spine of the Spiny Dogfish ( Squalus acanthias ) and Its Validity for Age Determination |
title_full_unstemmed |
Annulus Development on the Second Dorsal Spine of the Spiny Dogfish ( Squalus acanthias ) and Its Validity for Age Determination |
title_sort |
annulus development on the second dorsal spine of the spiny dogfish ( squalus acanthias ) and its validity for age determination |
publisher |
Canadian Science Publishing |
publishDate |
1985 |
url |
http://dx.doi.org/10.1139/f85-225 http://www.nrcresearchpress.com/doi/pdf/10.1139/f85-225 |
genre |
spiny dogfish Squalus acanthias |
genre_facet |
spiny dogfish Squalus acanthias |
op_source |
Canadian Journal of Fisheries and Aquatic Sciences volume 42, issue 11, page 1799-1805 ISSN 0706-652X 1205-7533 |
op_rights |
http://www.nrcresearchpress.com/page/about/CorporateTextAndDataMining |
op_doi |
https://doi.org/10.1139/f85-225 |
container_title |
Canadian Journal of Fisheries and Aquatic Sciences |
container_volume |
42 |
container_issue |
11 |
container_start_page |
1799 |
op_container_end_page |
1805 |
_version_ |
1785577096930656256 |