11. The fry swim after seven days and absorb the yolk sac in two weeks. 12. Among these is a fluid yolk sac that forms directly below the embryo proper. 13. During this period, the fry survive by consuming the remains of their yolk sacs . 14. This membrane along with hypoblast forms the primary yolk sac . 15. The actual yolk sac however does not directly supply nutrients to the developing embryo. 16. Other less common liver cancers include carcinosarcomas, teratomas, yolk sac tumours, carcinoid tumours and lymphomas. 17. Other articles that you may want to check out are Mammalian embryogenesis and Yolk sac . 18. LMO2 encodes a cysteine-rich, two LIM domain protein that is required for yolk sac erythropoiesis. 19. Reproduction is ovoviviparous with embryos receiving nourishment from a yolk sac while remaining inside the mother. 20. There is a correlation between having a single yolk sac and having a single amniotic sac.
