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Gross and histological observations of ovarian development in twaite shad, Alosa fallax fallax, from Rivers Mira and Guadiana (Portugal)

2003Journal article Open access
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dc.contributor.authorEsteves, E.
dc.contributor.authorPina, T.pt_PT
dc.contributor.authorAndrade, José Pedro
dc.date.accessioned2009-02-13T17:09:40Z
dc.date.available2009-02-13T17:09:40Z
dc.date.issued2003
dc.description.abstractIn order to describe the stages of oogenesis of twaite shad, Alosa fallax fallax, 265 females were collected between March and June 1997, February and June 1998 and January and April 1999 in the Rivers Mira and Guadiana. From the histological study of ovaries a total of eight developmental stages were delineated. Gross examination of paired ovary revealed that they could be placed into one of seven maturity stages according to their stage of development. Two stages of atresia, alfa and beta,were identified. Upon cessation of spawning, the ovaries still contained some oocytes at various stages of development but with a greater number of atretic oocytes. The simultaneous occurrence of tes at different stages of development in the ovary indicates asynchronous oocyte development. Oocyte size frequency distributions do not show a gap in size between cortical alveoli and vitellogenic oocytes during the spawning season. This may represent the ability of twaite shad to push oocytes through vitellogenesis from a previtellogenic condition during the spawning period. This has important implications for twaite shad fecundity, because fish with this type of oocyte development depend on timates of batch fecundity and spawning frequency to determine potential annual fecundity.pt_PT
dc.formatapplication/pdfpt_PT
dc.identifier.citationScientia Marina. - ISSN 0214-8358. - Vol. 67 (2003), p. 313-322pt_PT
dc.identifier.otherAUT: EES01759;
dc.identifier.urihttp://hdl.handle.net/10400.1/117
dc.language.isoengpt_PT
dc.subjectPescadopt_PT
dc.subjectNutrição animalpt_PT
dc.subjectRio Guadianapt_PT
dc.subjectRio Mirapt_PT
dc.titleGross and histological observations of ovarian development in twaite shad, Alosa fallax fallax, from Rivers Mira and Guadiana (Portugal)pt_PT
dc.typejournal article
dspace.entity.typePublication
oaire.citation.endPage313
oaire.citation.endPage322
oaire.citation.titleScientia Marina
oaire.citation.volume67
person.familyNameEsteves
person.familyNameAndrade
person.givenNameEduardo
person.givenNameJose
person.identifier.ciencia-idC81D-666A-FF24
person.identifier.ciencia-idD514-1A21-F020
person.identifier.orcid0000-0002-1872-8185
person.identifier.orcid0000-0002-5482-9776
person.identifier.ridE-9582-2012
person.identifier.scopus-author-id7003885183
person.identifier.scopus-author-id7201722097
rcaap.rightsopenAccess
rcaap.typearticlept_PT
relation.isAuthorOfPublicationaa7fd030-1bcb-4f16-83ad-508346a35f97
relation.isAuthorOfPublication8f1ffbdc-85aa-4342-8bd8-61eb6d6be74e
relation.isAuthorOfPublication.latestForDiscovery8f1ffbdc-85aa-4342-8bd8-61eb6d6be74e

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