Ganoidei is a term used to describe a group of fish that are characterized by their bony scales. Some synonyms for ganoidei include the words "ganoid fish," "primitive fish," and "bony fish." These fish are often found in freshwater environments and can be identified by their hard, armor-like scales that provide protection from predators. While ganoidei were once abundant, they have become increasingly rare in recent years due to factors such as habitat destruction and overfishing. Despite their decline, ganoidei remain important to the ecosystem and continue to play an important role in the food chain.