In an unfertilized egg, it's a very small white spot that contains only the female's genetic material. If the germinal disc looks more like a circle with a transparent (yellow) center, then it's ...
But what is caviar actually made of? Start the day smarter. Get all the news you need in your inbox each morning. Known to the world as a delicacy, caviar is unfertilized fish eggs with a salty taste.