Life history of a wide-ranging deepwater lantern shark in the north-east Atlantic, Etmopterus spinax (Chondrichthyes: Etmopteridae), with implications for conservation
In this paper, the population biology of the velvet belly lanternshark Etmopterus spinax was studied and life-history coefficients determined. Age was estimated from sections of the second dorsal spine and validated by marginal increment analysis. Males attained a maximum age of 8 years while 11 yea...
Published in: | Journal of Fish Biology |
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Language: | English |
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2008
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Online Access: | http://hdl.handle.net/10400.1/8806 https://doi.org/10.1111/j.1095-8649.2008.02021.x |
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ftunivalgarve:oai:sapientia.ualg.pt:10400.1/8806 2023-05-15T17:38:19+02:00 Life history of a wide-ranging deepwater lantern shark in the north-east Atlantic, Etmopterus spinax (Chondrichthyes: Etmopteridae), with implications for conservation Coelho, R. Erzini, Karim 2008 http://hdl.handle.net/10400.1/8806 https://doi.org/10.1111/j.1095-8649.2008.02021.x eng eng Wiley WOS:000259910700010 0022-1112 AUT: KER00534; http://hdl.handle.net/10400.1/8806 doi:10.1111/j.1095-8649.2008.02021.x restrictedAccess article 2008 ftunivalgarve https://doi.org/10.1111/j.1095-8649.2008.02021.x 2022-05-30T08:47:22Z In this paper, the population biology of the velvet belly lanternshark Etmopterus spinax was studied and life-history coefficients determined. Age was estimated from sections of the second dorsal spine and validated by marginal increment analysis. Males attained a maximum age of 8 years while 11 year-old females were found. Several growth models were fitted and compared for both size-at-age and mass-at-age data, showing that even though this is a small-sized species, it has a relatively slow growth rate. This species matures late, specifically at 49.6 and 42.5% of the maximum observed ages for males and females, respectively. It has a low fecundity, with a mean ovarian fecundity of 9.94 oocytes and a mean uterine fecundity of 7.59 embryos per reproductive cycle. This species seems to have a long reproductive cycle, and even though no conclusive data were obtained, a 2-3 year cycle is possible. The estimated coefficients indicate that this species has a vulnerable life cycle, typical of deepwater squalid sharks. Given the high fishing pressures that it is suffering in the north-east Atlantic, this fish may already be facing severe declines or in risk of facing them in the near future. (C) 2008 The Authors Journal compilation (C) 2008 The Fisheries Society of the British Isles Article in Journal/Newspaper North East Atlantic Universidade do Algarve: Sapienta Journal of Fish Biology 73 6 1419 1443 |
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Open Polar |
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Universidade do Algarve: Sapienta |
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ftunivalgarve |
language |
English |
description |
In this paper, the population biology of the velvet belly lanternshark Etmopterus spinax was studied and life-history coefficients determined. Age was estimated from sections of the second dorsal spine and validated by marginal increment analysis. Males attained a maximum age of 8 years while 11 year-old females were found. Several growth models were fitted and compared for both size-at-age and mass-at-age data, showing that even though this is a small-sized species, it has a relatively slow growth rate. This species matures late, specifically at 49.6 and 42.5% of the maximum observed ages for males and females, respectively. It has a low fecundity, with a mean ovarian fecundity of 9.94 oocytes and a mean uterine fecundity of 7.59 embryos per reproductive cycle. This species seems to have a long reproductive cycle, and even though no conclusive data were obtained, a 2-3 year cycle is possible. The estimated coefficients indicate that this species has a vulnerable life cycle, typical of deepwater squalid sharks. Given the high fishing pressures that it is suffering in the north-east Atlantic, this fish may already be facing severe declines or in risk of facing them in the near future. (C) 2008 The Authors Journal compilation (C) 2008 The Fisheries Society of the British Isles |
format |
Article in Journal/Newspaper |
author |
Coelho, R. Erzini, Karim |
spellingShingle |
Coelho, R. Erzini, Karim Life history of a wide-ranging deepwater lantern shark in the north-east Atlantic, Etmopterus spinax (Chondrichthyes: Etmopteridae), with implications for conservation |
author_facet |
Coelho, R. Erzini, Karim |
author_sort |
Coelho, R. |
title |
Life history of a wide-ranging deepwater lantern shark in the north-east Atlantic, Etmopterus spinax (Chondrichthyes: Etmopteridae), with implications for conservation |
title_short |
Life history of a wide-ranging deepwater lantern shark in the north-east Atlantic, Etmopterus spinax (Chondrichthyes: Etmopteridae), with implications for conservation |
title_full |
Life history of a wide-ranging deepwater lantern shark in the north-east Atlantic, Etmopterus spinax (Chondrichthyes: Etmopteridae), with implications for conservation |
title_fullStr |
Life history of a wide-ranging deepwater lantern shark in the north-east Atlantic, Etmopterus spinax (Chondrichthyes: Etmopteridae), with implications for conservation |
title_full_unstemmed |
Life history of a wide-ranging deepwater lantern shark in the north-east Atlantic, Etmopterus spinax (Chondrichthyes: Etmopteridae), with implications for conservation |
title_sort |
life history of a wide-ranging deepwater lantern shark in the north-east atlantic, etmopterus spinax (chondrichthyes: etmopteridae), with implications for conservation |
publisher |
Wiley |
publishDate |
2008 |
url |
http://hdl.handle.net/10400.1/8806 https://doi.org/10.1111/j.1095-8649.2008.02021.x |
genre |
North East Atlantic |
genre_facet |
North East Atlantic |
op_relation |
WOS:000259910700010 0022-1112 AUT: KER00534; http://hdl.handle.net/10400.1/8806 doi:10.1111/j.1095-8649.2008.02021.x |
op_rights |
restrictedAccess |
op_doi |
https://doi.org/10.1111/j.1095-8649.2008.02021.x |
container_title |
Journal of Fish Biology |
container_volume |
73 |
container_issue |
6 |
container_start_page |
1419 |
op_container_end_page |
1443 |
_version_ |
1766138707531792384 |