硬骨鱼纲
硬骨鱼纲 (Yìng gǔ yú gāng), or the class of bony fish, includes a vast group of fish characterized by their bony skeletons, as opposed to cartilage. This class, known scientifically as Osteichthyes, encompasses a wide variety of species, ranging from small tropical fish to large ocean predators. Bony fish are distinguished by their swim bladders, which help them maintain buoyancy in water.
These fish are found in diverse aquatic environments, including freshwater and marine ecosystems. They possess scales and gills for breathing, and many have developed unique adaptations for survival. The class of bony fish is further divided into two main groups: Actinopterygii, which includes most modern fish, and Sarcopterygii, which includes lobe-finned fish and ancestors of terrestrial vertebrates.