Consider a Galton-Watson process {Z(n)}, the Lotka-Negaev estimator for offspring mean m is R-n = Z(n+1)/Z(n). Let N-t be a Poisson process independent of {Z(n)}, the continuous time process {Z(Nt)} is a Poisson randomly indexed branching process. We show the asymptotic distributions for {R-t := R-Nt}.