Unlock the secrets of fish physiology and ecological adaptation. This essential guide offers a comprehensive overview of how diverse fish species thrive in every aquatic environment, from freshwater to extreme conditions. Discover the intricate physiological mechanisms, evolutionary strategies, and cutting-edge research techniques vital for understanding aquatic life. An indispensable resource for Indian students, researchers, and professionals in marine biology, zoology, and environmental science seeking deep knowledge in fish ecophysiology and environmental challenges.