Definitions for "Yolk Sac"
The small sac connected to a newborn salmon during the alevin stage of a salmon's development, which provides the tiny fish with protein, sugar, minerals, and vitamins.
One of four extraembryonic membranes that supports embryonic development; the first site of blood cells and circulatory system function.
A small sac connected to alevin which provides them with protein, sugar, minerals, and vitamins. Alevin live on this "lunch bag" for a month or so before emerging from the gravel and beginning to hunt food for themselves.
Keywords:  ventral, gut, primitive, extension, bag
A bag‑like, ventral extension of the primitive gut containing the yolk.