Reproductive biology of the species Leucoraja naevus from Portuguese continental waters

Detalhes bibliográficos
Autor(a) principal: Maia, Catarina
Data de Publicação: 2011
Tipo de documento: Dissertação
Idioma: eng
Título da fonte: Repositório Científico de Acesso Aberto de Portugal (Repositórios Cientìficos)
Texto Completo: http://hdl.handle.net/10400.1/1680
Resumo: Dissertação de mest., Biologia Marinha, Faculdade de Ciências e Tecnologia, Univ. do Algarve, 2010
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spelling Reproductive biology of the species Leucoraja naevus from Portuguese continental watersCuckoo rayFecundityMaturityReproductive seasonOviducal glandReproductive strategyPortugalRajidaeDissertação de mest., Biologia Marinha, Faculdade de Ciências e Tecnologia, Univ. do Algarve, 2010Skate populations tend to be highly vulnerable to exploitation as a result of the main life history characteristics (slow growth, late maturity and low fecundity). The cuckoo ray, Leucoraja naevus, one of the skate species landed in Portugal, is mainly a by-catch species from the artisanal mixed-fishery, and for this reason it is very difficult to acquire information about its basic biology. The two main goals of the present work were to estimate the length at first maturity, fecundity and reproductive cycle of the species Leucoraja naevus and to compare the microscopic structure and chemical nature of the secretions produced by the oviducal gland of the species Leucoraja naevus with other skate species taking into account their reproductive strategy. Although the species has been studied in other NE Atlantic geographic areas, namely Celtic Sea, Irish Sea and North Sea, this study is the first to provide information on the reproductive biology of Leucoraja naevus in Southern European waters. Length at first maturity was estimated at 57 cm and 55 cm TL for males and females, respectively. Active females were observed in every months of the year suggesting that reproduction may occur year round, with a reproductive peak during winter months between January and April. Females release follicles in batches of 5. However, it was not possible to determine the number of reproductive episodes realized by a female during a 1-year period. Leucoraja naevus, Raja brachyura, Raja miraletus, Raja undulata, Raja microocellata and Raja montagui, have similar microscopic structure divided in four zones: club, papillary, baffle and terminal. However, differences were found between Leucoraja naevus and the remaining species in the chemical nature of the secretions produced in the papillary zone, that seems to have a higher content of sulphated acid mucins, and in the terminal zone that, like in Raja microocellata, lacks serous gland tubules. The differences found are related with the reproductive strategy displayed by each species, namely with the capsule and spawning habitats characteristics. Sperm was found in all species as laterally aligned bundles in the deep recessed tubules of the baffle zone, adjacent to the muscle layer, suggesting short-term sperm storage. These results provide essential information on the reproductive biology not only about the species Leucoraja naevus but also about other by-catch species inhabiting Portuguese continental waters and, therefore, constitute an important tool for a proper management plan.Erzini, KarimFigueiredo, IvoneSapientiaMaia, Catarina2012-09-24T10:33:29Z20112011-01-01T00:00:00Zinfo:eu-repo/semantics/publishedVersioninfo:eu-repo/semantics/masterThesisapplication/pdfhttp://hdl.handle.net/10400.1/1680TID:202209440eng597 MAI*Rep Caveinfo: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:RCAAP2023-07-24T10:12:46Zoai:sapientia.ualg.pt:10400.1/1680Portal AgregadorONGhttps://www.rcaap.pt/oai/openaireopendoar:71602024-03-19T19:55:47.779918Repositório 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 Reproductive biology of the species Leucoraja naevus from Portuguese continental waters
title Reproductive biology of the species Leucoraja naevus from Portuguese continental waters
spellingShingle Reproductive biology of the species Leucoraja naevus from Portuguese continental waters
Maia, Catarina
Cuckoo ray
Fecundity
Maturity
Reproductive season
Oviducal gland
Reproductive strategy
Portugal
Rajidae
title_short Reproductive biology of the species Leucoraja naevus from Portuguese continental waters
title_full Reproductive biology of the species Leucoraja naevus from Portuguese continental waters
title_fullStr Reproductive biology of the species Leucoraja naevus from Portuguese continental waters
title_full_unstemmed Reproductive biology of the species Leucoraja naevus from Portuguese continental waters
title_sort Reproductive biology of the species Leucoraja naevus from Portuguese continental waters
author Maia, Catarina
author_facet Maia, Catarina
author_role author
dc.contributor.none.fl_str_mv Erzini, Karim
Figueiredo, Ivone
Sapientia
dc.contributor.author.fl_str_mv Maia, Catarina
dc.subject.por.fl_str_mv Cuckoo ray
Fecundity
Maturity
Reproductive season
Oviducal gland
Reproductive strategy
Portugal
Rajidae
topic Cuckoo ray
Fecundity
Maturity
Reproductive season
Oviducal gland
Reproductive strategy
Portugal
Rajidae
description Dissertação de mest., Biologia Marinha, Faculdade de Ciências e Tecnologia, Univ. do Algarve, 2010
publishDate 2011
dc.date.none.fl_str_mv 2011
2011-01-01T00:00:00Z
2012-09-24T10:33:29Z
dc.type.status.fl_str_mv info:eu-repo/semantics/publishedVersion
dc.type.driver.fl_str_mv info:eu-repo/semantics/masterThesis
format masterThesis
status_str publishedVersion
dc.identifier.uri.fl_str_mv http://hdl.handle.net/10400.1/1680
TID:202209440
url http://hdl.handle.net/10400.1/1680
identifier_str_mv TID:202209440
dc.language.iso.fl_str_mv eng
language eng
dc.relation.none.fl_str_mv 597 MAI*Rep Cave
dc.rights.driver.fl_str_mv info:eu-repo/semantics/openAccess
eu_rights_str_mv openAccess
dc.format.none.fl_str_mv application/pdf
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
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