Journal Article

Reproductive biology of <i>Atlantoraja cyclophora</i> (Regan 1903) (Elasmobranchii: Rajidae) off southern Brazil

María Cristina Oddone and Carolus Maria Vooren

in ICES Journal of Marine Science

Published on behalf of ICES/CIEM

Volume 62, issue 6, pages 1095-1103
Published in print January 2005 | ISSN: 1054-3139
Published online January 2005 | e-ISSN: 1095-9289 | DOI:
Reproductive biology of Atlantoraja cyclophora (Regan 1903) (Elasmobranchii: Rajidae) off southern Brazil

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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

Journal Article.  5363 words.  Illustrated.

Subjects: Environmental Science ; Marine and Estuarine Biology

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