Reproductive characteristics of the bathyal viviparous fish <i>Cataetyx alleni</i> (Osteichthyes: Bythitidae) from the southeastern Sardinian Sea (central-western Mediterranean) MARIA

Maria Cristina Follesa; Cristina Porcu; Antonello Mulas; Susanna Salvador; Angelo Cau

doi:10.3989/scimar.2011.75n2391

Autores/as

Maria Cristina Follesa Department of Animal Biology and Ecology, University of Cagliari
Cristina Porcu Department of Animal Biology and Ecology, University of Cagliari
Antonello Mulas Department of Animal Biology and Ecology, University of Cagliari
Susanna Salvador Department of Animal Biology and Ecology, University of Cagliari
Angelo Cau Department of Animal Biology and Ecology, University of Cagliari

DOI:

https://doi.org/10.3989/scimar.2011.75n2391

Palabras clave:

Cataetyx alleni, reproducción, fecundación interna, mar de Cerdeña

Resumen

La biología reproductiva de Cataetyx alleni, un pez vivíparo batial, fue descrita basándose en el examen de 34 especímenes (17 hembras y 17 machos) capturados durante las campañas experimentales de pesca de arrastre conducidas entre 800 y 1700 metros de profundidad en el sureste del mar de Cerdeña (Mediterráneo centro-occidental). Hembras y machos presentaron tallas similares. Por primera vez, la fecundación interna fue demostrada gracias al descubrimiento de espermatozoos libres dispersos en la cavidad del ovario. Basándose en análisis macroscópicos e histológicos, las hembras maduras fueron encontradas en verano, otoño e invierno, sugiriendo un periodo reproductivo muy largo. Las hembras fecundadas fueron observadas sólo durante el mes de Noviembre y Enero, conjuntamente con los machos de madurez máxima. Estos datos podrían suponer un posible máximo reproductivo con cópula durante el otoño y el invierno. Además, los exámenes histológicos demostraron que los ovarios de este Bythitidae presentan un modelo de sincronización de grupo. Ningún espermatóforo ni embriones fueron observados en las secciones histológicas analizadas.

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