The primary nutrient found in fish is protein. Fish is a high-quality source of protein that is rich in essential amino acids, making it an excellent dietary choice for building and repairing tissues in the body. In addition to protein, fish is also a significant source of omega-3 fatty acids, which are beneficial for heart health, brain function, and reducing inflammation. Additionally, fish contains important vitamins and minerals, such as vitamin D, vitamin B12, iodine, and selenium. Regular consumption of fish is often recommended as part of a balanced diet due to its various health benefits and nutrient density.