Please use this identifier to cite or link to this item: http://hdl.handle.net/2440/23615
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dc.contributor.authorBraccini, J.en
dc.contributor.authorGillanders, B.en
dc.contributor.authorWalker, T.en
dc.date.issued2006en
dc.identifier.citationMarine and Freshwater Research, 2006; 57(1):105-119en
dc.identifier.issn1323-1650en
dc.identifier.urihttp://hdl.handle.net/2440/23615-
dc.description.abstractPopulation assessments of chondrichthyan species require several key parameters of their reproductive biology, which were estimated for Squalus megalops (Macleay, 1881). Length-at-maturity differed depending on the criterion adopted for defining maturity. In the case of males, length-at-maturity was smallest when condition of seminal vesicles was adopted as a maturity criterion. For females, length-at-maturity was smallest when the largest follicle diameter >3 mm was adopted as the criterion for maturity; this was appropriate only as an indicator of the onset of maturity. Mature males are capable of mating throughout the year. Females have a continuous asynchronous reproductive cycle. The sex ratio of embryos is 1 : 1 and litter size and near-term embryo length increase with maternal length. Females have an ovarian cycle and gestation period of two years. This was reflected in the differences found between the maturity and maternity ogives. Although all females are mature at 600 mm, only 50% of them contribute to annual recruitment each year. Hence, for chondrichthyan species with reproductive cycles of two, three or more years, if maturity ogives are used in population assessments instead of maternity ogives, the models will overestimate recruitment rates.en
dc.description.statementofresponsibilityJ. Matías Braccini, Bronwyn M. Gillanders A and Terence I. Walkeren
dc.language.isoenen
dc.publisherC S I R O Publishingen
dc.rights© CSIRO 2006en
dc.subjectasynchrony; Australia; reproductionen
dc.titleDetermining reproductive parameters for population assessments of chondrichthyan species with asynchronous ovulation and parturition: piked spurdog (Squalus megalops) as a case studyen
dc.typeJournal articleen
dc.identifier.rmid0020060083en
dc.identifier.doi10.1071/MF05076en
dc.identifier.pubid53251-
pubs.library.collectionEarth and Environmental Sciences publicationsen
pubs.verification-statusVerifieden
pubs.publication-statusPublisheden
Appears in Collections:Earth and Environmental Sciences publications
Environment Institute Leaders publications

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