Most sharks are ovoviviparous , meaning that the eggs hatch in the oviduct within the mother 's body and that the egg 's yolk and fluids secreted by glands in the walls of the oviduct nourishes the embryos .
Most sharks are ovoviviparous , meaning the eggs hatch inside the female 's body , with the babies developing within the mother , but there is no placenta to nourish the pups .