Winter-spring is the breeding period off the Florida east coast (Gilmore et al. 1983). Individuals may aggregate in specific areas for mating (Michael 1993). Development is ovoviviparous. The gestation time is very long (10.5 months) (Pratt and Casey 1987). Individuals are about 65-110 cm total length at birth (Gilmore et al. 1983; Michael 1993). Age and growth data are lacking except for captive specimens (Branstetter 1990). The birthing season in Florida waters occurs during November through February. Adult females produce only two extremely large (> 100 cm) young per mating season (embryos are oviphagous and cannibalistic) (Castro 1983, Gilmore et al. 1983). Females reach maturity at 237 cm total length (Pratt and Casey 1987).