In Fish
All bony fishes, some sharks and rays have yolk sacs at some stage of development, with all oviparous fished retaining the sac after hatching. Lamniform sharks are ovoviviparous, in that their eggs hatch in utero, in addition to eating unfertilized eggs, unborn sharks participate in intrauterine-cannibalism: stronger pups consume their weaker womb-mates.
Read more about this topic: Yolk Sac
Famous quotes containing the word fish:
“Do not tell fish stories where the people know you; but particularly, don’t tell them where they know the fish.”
—Mark Twain [Samuel Langhorne Clemens] (1835–1910)
“My face is muffled in my mother’s clothing. Her rhinestones injure me. See: my feet are going. Fish flee the forefinger of my aunt. The sun streams over the geraniums. What has this to do with what I feel, with what I am.”
—William Gass (b. 1924)