Pacific halibut is the largest species of flatfish. They are from the family of righteye flounders; both eyes are on one side of their body. Halibut is rich in nutrients such as potassium, vitamin D, Omega-3 fatty acids, selenium, phosphorus, magnesium, and vitamin B12. It is considered one of the most popular white fish and a sustainable seafood choice. Never runs out of ideas on how to cook it.