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ICES Journal of Marine Science: Journal du Conseil 2005 62(6):1095-1103; doi:10.1016/j.icesjms.2005.05.002
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© 2005 International Council for the Exploration of the Sea

Reproductive biology of Atlantoraja cyclophora (Regan 1903) (Elasmobranchii: Rajidae) off southern Brazil

María Cristina Oddonea,* and Carolus Maria Voorenb

a Universidade Estadual Paulista, Departamento de Ecologia Campus Rio Claro Av. 24-A 1515, CP 199, CEP 13506-900, Rio Claro, SP, Brazil
b Fundação Universidade do Rio Grande, Dpto de Oceanografia Laboratório de Elasmobrânquios e Aves Marinhas Caixa Postal 474, CEP 96201-900, Rio Grande-RS, Brazil

*Correspondence to M. C. Oddone: tel: +55 19 35264225; fax: +55 19 35264226. e-mail: mcoddone{at}rc.unesp.br.

A total of 459 (245 females, 214 males) Atlantoraja cyclophora was captured by bottom trawl off the coast of Rio Grande do Sul between 30°40'S and 34°30'S during surveys conducted in winter 2001 and summer/autumn 2002 at depths of 100–300 m. Total length at maturity was 52.8 cm for females and 48.5 cm for males. Symmetry and functional parity of the gonads were observed in both sexes, but there was no significant temporal variation in either sex for any of the reproductive parameters studied. Ovulation and egg-deposition were similarly intensive in both seasons. In adult females, there was an ovarian resting period at an individual level, though it was not synchronized at a population level. Distribution of egg-bearing females was not related to depth or species' range.

Keywords: Atlantoraja, egg-bearing, egg-deposition, length at sexual maturity, reproduction, SW Atlantic

Received 31 January 2005; accepted 30 April 2005.


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