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

Autores/as

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

Palabras clave:

clasper, elasmobranquios, glándula nidamentária, deposición de cápsulas ovígeras, gónadas

Resumen

Se colectaron especímenes de Rioraja agassizi en el puerto de Guarujá, Estado de San Pablo, Brasil, desde marzo de 2005 hasta marzo de 2006. Se capturó un número total de 275 machos. De acuerdo con el análisis de la longitud del clasper y de la glándula del clasper, el peso de las gónadas, el diámetro de los lóbulos y el número de espinas alares, el tamaño de primera madurez sexual fue estimado en 32 cm. Se capturó un número de 1049 hembras. El tamaño de primera madurez sexual fue calculado en 40 cm. Se observó reposo sexual en hembras de esta especie. Los índices gonadosomáticos y hepatosomáticos variaron significativamente en ambos sexos a lo largo del año. Sin embargo, la ovulación y la deposición de cápsulas ovígeras sucedieron continuamente durante todo el año, así como la presencia de esperma en la vesícula seminal en ejemplares adultos. Por este motivo, se propone para esta especie, un ciclo reproductivo anual, con por lo menos un pico en la actividad sexual.

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