Papers/Abstracts

Reproductive biology of the blue shark Prionace glauca (Chondrichthyes: Carcharhinidae) off Baja California Sur, México

Maribel Carrera- Fernández, Felipe Galván-Magaña and B. Patricia Ceballos-Vázquez

aqua, International Journal of Ichthyology, pp. 101-110, Volume 16, Issue 3 – 15 July 2010

Abstract

The blue shark Prionace glauca (Linnaeus) is the most abundant species in the artisanal shark fishery off the western coast of Baja California Sur, Mexico. However, there is no biological information on the reproduction of blue sharks in this area. A total of 1033 sharks (631 males and 402 females) were sampled from August 2000 to March 2003. The sex ratio was 0.63F:1M. The size at maturity (L50) for males was 184 cm total length (TL) and 196 cm TL for females. The litter size ranged from 9 to 64, with a mode of 33 embryos. Ovulation, fertilization, presence of uterine eggs and the smallest embryos were observed in August and September; whereas complete embryos were recorded in May and July, with a gestation period of 9 to 11 months. We found compound spermatozeugmata in the seminal vesicle of mature males and sperm in the oviducal glands of females in different maturity stages, which indicate long-term sperm storage. We confirm that the main portion of the shark fishery in Baja California Sur is supported by juvenile sharks.

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