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Glossary: yolk

February 15th, 2012 — 3:39pm

Substance in an animal egg consisting of protein and fat that nourishes the developing embryo.

Glossary: yolk sac

February 15th, 2012 — 3:39pm

A membranous sac containing yolk attached to the ventral surface of embryos and early larvae in some fishes. Retained for a period post-hatching in those species which form yolk sac larvae.

Glossary: yolk sac larva

February 15th, 2012 — 3:39pm

Post-hatching larval stage occurring in many fish species whereby the yolk sac remains attached to the ventral surface for a period. The larva does not feed normally until the yolk is fully-absorbed.

Glossary: yolk sac viviparity

February 15th, 2012 — 3:39pm

Form of livebearing in which the larvae are mostly nourished by a yolk sac which is fully-absorbed prior to birth.