Fish

Fish, a diverse group of aquatic vertebrates, are characterized by their ability to breathe underwater through gills and typically have bodies covered with scales. They are found in nearly every aquatic environment on Earth, from deep oceanic trenches to high mountain streams, showcasing an extensive range of adaptations like bioluminescence in deep-sea species or electroreception in freshwater electric fishes. The group is broadly categorized into three main classes: Agnatha (jawless fish like lampreys and hagfish), Chondrichthyes (cartilaginous fish such as sharks and rays), and Osteichthyes (bony fish, including salmon and tuna). Fish play vital roles in their ecosystems as prey and predators, contribute significantly to human diets through fishing industries, and are central to ecological and evolutionary studies due to their complex behaviors and biodiversity.

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