Cycloideans, also known as cycloidei, is a taxonomic group in the classification of fish. They are a suborder of fishes belonging to the order of Perciformes. The term "cycloideans" originates from the Greek word "kyklos" meaning "circle" or "circular," highlighting the distinct circular shape of their scales.
Members of the cycloidean suborder possess specific characteristics that set them apart from other fish species. These traits include their relatively small mouths, cycloid scales, and the presence of small spines on their gill covers. Cycloid scales refer to scales that lack the bony ridges or spines found in other types of scales. This gives the fish a smooth and rounded appearance.
Cycloideans are a diverse group, consisting of numerous families and species that inhabit various aquatic environments, including both freshwater and marine systems. Some well-known examples of cycloidean families include the Cyprinidae (including carp and minnows), the Salmonidae (including salmon and trout), and the Gobiidae (including gobies).
The suborder has relevance in the field of biology and fisheries due to the economic and ecological significance of many cycloidean species. They are often highly valued for sport fishing, commercial harvesting, and aquaculture purposes. Furthermore, some cycloidean species play crucial roles in their respective ecosystems, acting as key predators or prey, maintaining a delicate balance within their habitats.
Overall, cycloideans form a diverse and important suborder of fish, characterized by their circular scales and various ecological roles across different aquatic ecosystems.
