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Home›Glossary›Y

Glossary

yolk

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

Used in 112 species profiles

Ancistrus sp.
Aphyocharax anisitsi
Garra bicornuta
Garra flavatra
Heterandria formosa
Neoheterandria elegans

Related terms

embryo
A young, unborn or unhatched organism in the process of development.
lecithotrophy
Literally, 'feeding on yolk'. A form of development in which an embryo receives no nutrition other than the yolk contained within its egg.
yolk sac
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.
yolk sac larva
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.

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Seriously Fish · est. 2009

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