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:
“The beasts, the fishes, and the winged fowls
Are their males’ subjects and at their controls:
Man, more divine, the master of all these,
Lord of the wide world and wild watery seas,
Indued with intellectual sense and souls,
Of more pre-eminence than fish and fowls,
Are masters to their females, and their lords:
Then let your will attend on their accords.”
—William Shakespeare (1564–1616)
“Little fish swam by his nose
and he noted them and touched their slime.
Plankton came and he held them in his palm
like God’s littlest light bulbs.”
—Anne Sexton (1928–1974)