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A manual of zoology. PHYLUM CHORDATA 387 going on. By the time the young fish is ready to be born or hatched, the greater part of the yolk-sac has been drawn
Sulikowski Shark and Fish Conservation Lab - Blue shark baby! Blue shark (Prionace glauca) are viviparous, with a yolk-sac placenta. In this form of reproduction the mother and baby have a direct
Shark Research at University of Miami - Nurse sharks are ovoviviparous, meaning an egg case develops inside the womb. Each embryo has its own yolk sac and no placental nourishment comes from
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![Chuck "Charles" Bangley, PhD on Twitter: "Spiny dogfish practice a form of live birth called yolk sac viviparity. The terminology has changed around a bit, but the general idea is that these Chuck "Charles" Bangley, PhD on Twitter: "Spiny dogfish practice a form of live birth called yolk sac viviparity. The terminology has changed around a bit, but the general idea is that these](https://pbs.twimg.com/media/EwEDof9XcAsDeMo.jpg)