Definition
Ganoine is the shiny, enamel-like substance covering ganoid scales, found on fish like gars and bichirs. Think of it as the original bulletproof vest for fish! It's made of mineral salts and provides a tough barrier against injury. Unlike modern fish scales, ganoid scales don’t overlap, creating a rigid armor. Ganoine is considered an ancient form of enamel, making it significant in evolutionary studies. Its presence indicates an ancient lineage within fish.