Fish health refers to the overall well-being of fish, which can be influenced by various factors such as water quality, diet, and environmental conditions. Healthy fish typically exhibit vibrant colors, active behavior, and a good appetite. Regular monitoring of water parameters like temperature, pH, and ammonia levels is essential for maintaining a suitable habitat. Common health issues in fish include diseases caused by parasites, bacteria, or fungi, as well as stress from overcrowding or poor water conditions. Proper nutrition, regular tank maintenance, and prompt treatment of any health issues are crucial for ensuring the longevity and vitality of fish in both aquariums and natural habitats.