Fish diseases are health issues that affect fish, often caused by pathogens like bacteria, viruses, fungi, or parasites. These diseases can lead to symptoms such as abnormal swimming, lesions, or changes in color. Environmental factors, such as poor water quality or overcrowding, can also contribute to the spread of diseases among fish populations. Preventing fish diseases involves maintaining a clean habitat, ensuring proper nutrition, and monitoring water conditions. Early detection and treatment are crucial for managing outbreaks. Common diseases include ichthyophthirius (ich), fin rot, and dropsy, each requiring specific care and management strategies to protect fish health.