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Empty Egg Sac | Whitespotted Bamboo Shark (Chiloscyliium plagiosum) | Japan | Tony Wu Underwater Photography
![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)
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
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Steven Cohen: Will the biggest fish in the hedge fund ocean get to swim free again? | The Independent | The Independent
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
![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 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](https://c8.alamy.com/comp/RDJF9G/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-into-the-coelom-a-mere-vestige-of-it-still-dangling-from-the-ventral-surface-of-the-body-in-all-the-most-important-features-of-their-organisation-there-is-a-considerable-degree-of-uniformity-among-the-elasmobranchii-in-general-shape-the-sharks-fig-231-for-the-most-part-are-somewhat-fusiform-and-slightly-compressed-laterally-in-the-rays-fig-232-on-the-other-hand-there-is-great-dorso-flg-231-shark-lamna-cornubica-f-RDJF9G.jpg)