Fish, belonging to the diverse class of aquatic vertebrates known as Pisces, encompass a vast array of species adapted to life in freshwater and saltwater environments worldwide. From the tiny guppies found in tropical streams to the massive whale sharks cruising the ocean depths, fish exhibit incredible diversity in size, shape, coloration, and behavior. Their bodies are streamlined for efficient movement through water, with fins and tails aiding in propulsion and maneuverability. Fish utilize a variety of feeding strategies, from filter-feeding planktivores to apex predators hunting in open waters. They play crucial roles in aquatic ecosystems, serving as both prey and predators and contributing to nutrient cycling. However, fish populations face significant threats from overfishing, habitat destruction, pollution, and climate change, necessitating sustainable management practices and conservation efforts to ensure the health and resilience of aquatic ecosystems.