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

María Cristina Oddone; Alberto F. Amorim; Patricia L. Mancini; Walter Norbis; Gonzalo Velasco

doi:10.3989/scimar.2007.71n3593

Authors

María Cristina Oddone Universidade Estadual Paulista, Departamento de Ecologia, Campus Rio Claro
Alberto F. Amorim Instituto de Pesca
Patricia L. Mancini Projeto Albatroz.
Walter Norbis Dirección Nacional de Recursos Acuáticos, Departamento de Biología Pesquera
Gonzalo Velasco Universidade Estadual Paulista, Departamento de Ecologia, Campus Rio Claro

DOI:

https://doi.org/10.3989/scimar.2007.71n3593

Keywords:

clasper, clasper gland, vitellogenic follicles, elasmobranchs, nidamental gland, egg-bearing, gonads

Abstract

Specimens 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.

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