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:
“I close my eyes and suck you in like a fire.
I grow. I grow. I’m fattening out.
I’m a kid in a rowboat and you’re the sea,
the salt, you’re every fish of importance.”
—Anne Sexton (1928–1974)
“A harvest mouse goes scampering by,
With silver claws and silver eye;
And moveless fish in the water gleam,
By silver reeds in a silver stream.”
—Walter De La Mare (1873–1956)