Age and growth of the squid Loligo vulgaris off the south coast of Portugal, using statolith analysis
Autor(a) principal: | |
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Data de Publicação: | 1996 |
Outros Autores: | , , |
Tipo de documento: | Artigo |
Idioma: | eng |
Título da fonte: | Repositório Científico de Acesso Aberto de Portugal (Repositórios Cientìficos) |
Texto Completo: | http://hdl.handle.net/10400.1/11179 |
Resumo: | Age composition and growth rates of the squid Loligo vulgaris (Lamark, 1797) were studied by examination of growth increments within statoliths of 419 specimens (mantle length, ML, ranging from 32 to 400 mm). The squid were obtained by monthly sampling from the catches of commercial trawls off southern Portugal between March and September, 1993. The total number of growth increments in the mounted and ground statoliths was counted using a semi-automatic image analysis system. ML was significantly correlated with both the statolith length, TSL and the number of increments, NI. The female statolith was slightly larger than the male statolith for the same mantle size. Growth rates of individuals showed high variability with an average estimated at 34.6 mm month(-1) for males and 33.5 mm month(-1) for females. Growth in length between 70 and 280 days was best described by a power function for both sexes. The growth index of the statolith (TSL/NI) decreased with individual growth. This result may be related with the onset of sexual maturation. L. vulgaris hatched throughout the year with two distinct peaks, in spring which is the main breeding period, and in autumn. The life cycle of the L. vulgaris population on the south Portuguese shelf was completed in one year. |
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Repositório Científico de Acesso Aberto de Portugal (Repositórios Cientìficos) |
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Age and growth of the squid Loligo vulgaris off the south coast of Portugal, using statolith analysisIncrement analysisEuropean squidMaturationMicrostructureCephalopodsLoliginidaeAge composition and growth rates of the squid Loligo vulgaris (Lamark, 1797) were studied by examination of growth increments within statoliths of 419 specimens (mantle length, ML, ranging from 32 to 400 mm). The squid were obtained by monthly sampling from the catches of commercial trawls off southern Portugal between March and September, 1993. The total number of growth increments in the mounted and ground statoliths was counted using a semi-automatic image analysis system. ML was significantly correlated with both the statolith length, TSL and the number of increments, NI. The female statolith was slightly larger than the male statolith for the same mantle size. Growth rates of individuals showed high variability with an average estimated at 34.6 mm month(-1) for males and 33.5 mm month(-1) for females. Growth in length between 70 and 280 days was best described by a power function for both sexes. The growth index of the statolith (TSL/NI) decreased with individual growth. This result may be related with the onset of sexual maturation. L. vulgaris hatched throughout the year with two distinct peaks, in spring which is the main breeding period, and in autumn. The life cycle of the L. vulgaris population on the south Portuguese shelf was completed in one year.Oxford Univ Press United KingdomSapientiaBettencourt, V.Coelho, NelsonAndrade, Andrade, José PedroGuerra, A.2018-12-07T14:52:43Z1996-081996-08-01T00:00:00Zinfo:eu-repo/semantics/publishedVersioninfo:eu-repo/semantics/articleapplication/pdfapplication/pdfhttp://hdl.handle.net/10400.1/11179eng0260-123010.1093/mollus/62.3.359info:eu-repo/semantics/openAccessreponame:Repositório Científico de Acesso Aberto de Portugal (Repositórios Cientìficos)instname:Agência para a Sociedade do Conhecimento (UMIC) - FCT - Sociedade da Informaçãoinstacron:RCAAP2023-07-24T10:22:56Zoai:sapientia.ualg.pt:10400.1/11179Portal AgregadorONGhttps://www.rcaap.pt/oai/openaireopendoar:71602024-03-19T20:02:41.538846Repositório Científico de Acesso Aberto de Portugal (Repositórios Cientìficos) - Agência para a Sociedade do Conhecimento (UMIC) - FCT - Sociedade da Informaçãofalse |
dc.title.none.fl_str_mv |
Age and growth of the squid Loligo vulgaris off the south coast of Portugal, using statolith analysis |
title |
Age and growth of the squid Loligo vulgaris off the south coast of Portugal, using statolith analysis |
spellingShingle |
Age and growth of the squid Loligo vulgaris off the south coast of Portugal, using statolith analysis Bettencourt, V. Increment analysis European squid Maturation Microstructure Cephalopods Loliginidae |
title_short |
Age and growth of the squid Loligo vulgaris off the south coast of Portugal, using statolith analysis |
title_full |
Age and growth of the squid Loligo vulgaris off the south coast of Portugal, using statolith analysis |
title_fullStr |
Age and growth of the squid Loligo vulgaris off the south coast of Portugal, using statolith analysis |
title_full_unstemmed |
Age and growth of the squid Loligo vulgaris off the south coast of Portugal, using statolith analysis |
title_sort |
Age and growth of the squid Loligo vulgaris off the south coast of Portugal, using statolith analysis |
author |
Bettencourt, V. |
author_facet |
Bettencourt, V. Coelho, Nelson Andrade, Andrade, José Pedro Guerra, A. |
author_role |
author |
author2 |
Coelho, Nelson Andrade, Andrade, José Pedro Guerra, A. |
author2_role |
author author author |
dc.contributor.none.fl_str_mv |
Sapientia |
dc.contributor.author.fl_str_mv |
Bettencourt, V. Coelho, Nelson Andrade, Andrade, José Pedro Guerra, A. |
dc.subject.por.fl_str_mv |
Increment analysis European squid Maturation Microstructure Cephalopods Loliginidae |
topic |
Increment analysis European squid Maturation Microstructure Cephalopods Loliginidae |
description |
Age composition and growth rates of the squid Loligo vulgaris (Lamark, 1797) were studied by examination of growth increments within statoliths of 419 specimens (mantle length, ML, ranging from 32 to 400 mm). The squid were obtained by monthly sampling from the catches of commercial trawls off southern Portugal between March and September, 1993. The total number of growth increments in the mounted and ground statoliths was counted using a semi-automatic image analysis system. ML was significantly correlated with both the statolith length, TSL and the number of increments, NI. The female statolith was slightly larger than the male statolith for the same mantle size. Growth rates of individuals showed high variability with an average estimated at 34.6 mm month(-1) for males and 33.5 mm month(-1) for females. Growth in length between 70 and 280 days was best described by a power function for both sexes. The growth index of the statolith (TSL/NI) decreased with individual growth. This result may be related with the onset of sexual maturation. L. vulgaris hatched throughout the year with two distinct peaks, in spring which is the main breeding period, and in autumn. The life cycle of the L. vulgaris population on the south Portuguese shelf was completed in one year. |
publishDate |
1996 |
dc.date.none.fl_str_mv |
1996-08 1996-08-01T00:00:00Z 2018-12-07T14:52:43Z |
dc.type.status.fl_str_mv |
info:eu-repo/semantics/publishedVersion |
dc.type.driver.fl_str_mv |
info:eu-repo/semantics/article |
format |
article |
status_str |
publishedVersion |
dc.identifier.uri.fl_str_mv |
http://hdl.handle.net/10400.1/11179 |
url |
http://hdl.handle.net/10400.1/11179 |
dc.language.iso.fl_str_mv |
eng |
language |
eng |
dc.relation.none.fl_str_mv |
0260-1230 10.1093/mollus/62.3.359 |
dc.rights.driver.fl_str_mv |
info:eu-repo/semantics/openAccess |
eu_rights_str_mv |
openAccess |
dc.format.none.fl_str_mv |
application/pdf application/pdf |
dc.publisher.none.fl_str_mv |
Oxford Univ Press United Kingdom |
publisher.none.fl_str_mv |
Oxford Univ Press United Kingdom |
dc.source.none.fl_str_mv |
reponame:Repositório Científico de Acesso Aberto de Portugal (Repositórios Cientìficos) instname:Agência para a Sociedade do Conhecimento (UMIC) - FCT - Sociedade da Informação instacron:RCAAP |
instname_str |
Agência para a Sociedade do Conhecimento (UMIC) - FCT - Sociedade da Informação |
instacron_str |
RCAAP |
institution |
RCAAP |
reponame_str |
Repositório Científico de Acesso Aberto de Portugal (Repositórios Cientìficos) |
collection |
Repositório Científico de Acesso Aberto de Portugal (Repositórios Cientìficos) |
repository.name.fl_str_mv |
Repositório Científico de Acesso Aberto de Portugal (Repositórios Cientìficos) - Agência para a Sociedade do Conhecimento (UMIC) - FCT - Sociedade da Informação |
repository.mail.fl_str_mv |
|
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1799133261598818305 |