Resumen del producto

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 fishery primarily targets juveniles. The sex ratio was 0.63F:1M. The size at maturity (L₅₀) for males was 180 cm total length (TL) and 200 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.

Palabras clave: Reproduction; Eastern Pacific Ocean; blue shark

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