Contrary to some of the literature cited here, we've been using male greens/female BG to make our hybrids, and never seen any evidence of reproduction, despite the fact that this cross is supposed to result in a much higher incidence of female offspring, than the reciprocal cross.
I know that the hybrids are claimed to have much lower fecudnity, and MAYBE all the resultant fry are eaten before we see them, but we've NEVER seen any.