Definition: Yolk sac is a larval structure enclosing stored nutrients derived from the egg. In many fish it is retained for a period after hatching. In these cases the newly hatched fry feed off the nutrients in the yolk sac until they can swim and feed on their own.
yolk sac
By Shirlie Sharpe, About.com Guide
Salmon Fry With Yolk Sac
Photo © Open CageSuggested Reading
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