Fish eggs, also known as ROE, are a delicacy in many cultures. ROE is the unfertilized egg masses of fish and other marine animals, typically consisting of three-letter clusters. CAVIAR is a type of ROE that is harvested from sturgeon and is considered a luxury food. SPAWN is the mass of eggs laid by fish or amphibians, usually consisting of five-letter clusters. Roes are the egg masses of certain fish, typically consisting of four-letter clusters.