The reproductive biology and cycle of Rioraja agassizi (Müller and Henle, 1841) (Chondrichthyes: Rajidae) in southeastern Brazil, SW Atlantic Ocean

dc.contributorUniversidade Estadual Paulista (UNESP)
dc.creatorOddone, María Cristina
dc.creatorAmorim, Alberto F.
dc.creatorMancini, Patricia L.
dc.creatorNorbis, Walter
dc.creatorVelasco, Gonzalo
dc.date2014-05-27T11:22:42Z
dc.date2016-10-25T18:24:47Z
dc.date2014-05-27T11:22:42Z
dc.date2016-10-25T18:24:47Z
dc.date2007-12-01
dc.date.accessioned2017-04-06T01:28:19Z
dc.date.available2017-04-06T01:28:19Z
dc.identifierScientia Marina, v. 71, n. 3, p. 593-604, 2007.
dc.identifier0214-8358
dc.identifierhttp://hdl.handle.net/11449/70098
dc.identifierhttp://acervodigital.unesp.br/handle/11449/70098
dc.identifier10.3989/scimar.2007.71n3593
dc.identifier2-s2.0-35348906014.pdf
dc.identifier2-s2.0-35348906014
dc.identifierhttp://dx.doi.org/10.3989/scimar.2007.71n3593
dc.identifier.urihttp://repositorioslatinoamericanos.uchile.cl/handle/2250/891246
dc.descriptionSpecimens of Rioraja agassizi were collected at Guarujá pier, São Paulo State, Brazil, from March 2005 to March 2006. A total of 275 males were captured. Based on the analysis of the clasper length, gonad weight, clasper gland length, alar thorns and lobule diameter, the size-at-maturity was estimated to be 32 cm. There were 1049 females in the record. Size-at-maturity was calculated in 40 cm. Sexual resting females were observed. Gonadosomatic and hepatosomatic indexes varied significantly in both sexes throughout the year. However, ovulation, egg-laying and presence of sperm in the seminal vesicle were observed all year round. For this reason, an annual cycle with at least one peak in the sexual activity is proposed for this species.
dc.languageeng
dc.relationScientia Marina
dc.rightsinfo:eu-repo/semantics/openAccess
dc.subjectClasper
dc.subjectClasper gland
dc.subjectEgg-bearing
dc.subjectElasmobranchs
dc.subjectGonads
dc.subjectNidamental gland
dc.subjectVitellogenic follicles
dc.subjectfish
dc.subjectgamete
dc.subjectreproductive biology
dc.subjectreproductive cycle
dc.subjectsexual behavior
dc.subjectsexual reproduction
dc.subjectsize at maturity
dc.subjectAtlantic Ocean
dc.subjectBrazil
dc.subjectSao Paulo [Brazil]
dc.subjectSouth America
dc.subjectChondrichthyes
dc.subjectElasmobranchii
dc.subjectRajidae
dc.subjectRioraja
dc.titleThe reproductive biology and cycle of Rioraja agassizi (Müller and Henle, 1841) (Chondrichthyes: Rajidae) in southeastern Brazil, SW Atlantic Ocean
dc.typeOtro


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