Name the nutrients fish and seafood provide.

Seafood is a rich source of a number of nutrients, including vitamins, minerals, high-quality proteins, omega-3 fatty acids, and more. Here is a list of all the nutrients provided by seafood:
Vitamins A, B, and D;
Omega-3 fatty acids: EPA (eicosapentaenoic acid) and DHA (docosahexaenoic acid)
calcium
phosphorous
zinc
iron
iodine
magnesium
potassium
In addition, fish is beneficial to a low-fat diet as compared to red meats.
Vitamin A is needed to boost our immune system and protect our vision. Vitamin B-complex has a significant effect on metabolism and energy production. Vitamin D is essential for the healthy growth of bones, the absorption of calcium, and the efficiency of the immune system.
Omega-3 fatty acids promote a healthy cardiovascular system, aid brain function, and reduce the risks of a number of health conditions, including depression, ADHD, dementia, Alzheimer's disease, and diabetes. These acids are not produced in our bodies and hence must be obtained from external sources. Fatty fishes such as salmon, tuna, trout, and sardines contain high amounts of omega-3 fatty acids.