The parameters of the von Bertalanffy growth model are estimated for seven species of Mustelus by extrapolation from embryonic growth rates. The method, developed by Holden (1974), requires information on maximum observed length, gestation period and size at birth. Each of the seven species of Mustelus whose reproductive biology has been studied has a gestation period of 10-13 months. Estimated von Bertalanffy growth constants range from 0.22 to 0.53 for males and 0.21 to 0.36 for females. Sexual maturity is attained 1-4 years after birth. The results obtained using Holden's method are suitable for rapid preliminary estimation of growth rates for purposes of fishery management.