Salmon oil is extracted from salmon, and deep-sea fish oil is extracted from deep-sea fish (such as cod and mackerel). There are some differences in nutritional components between the two fish oils. Salmon oil is rich in Omega-3 fatty acids, especially EPA and DHA, which are beneficial to heart health and brain function. Deep-sea fish oil is also rich in omega-3 fatty acids, but the specific content may vary depending on the fish species. Moreover, salmon oil also contains high content of vitamin D and vitamin A, while deep-sea fish oil has relatively low vitamin content.