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Finfishes are aquatic vertebrates with fins and scales, typically breathing through gills. They are characterized by their streamlined bodies that allow them to move efficiently through the water. Finfishes encompass a wide variety of species including familiar ones such as salmon, tuna, and cod, as well as more exotic species like angelfish, clownfish, and seahorses. These creatures play a vital role in marine ecosystems as both predators and prey, contributing to the overall health and balance of underwater environments.