Fish and Shellfish: Purchasing to Preparation

Health benefits of eating fish include Omega-3 fatty acids and Vitamin D.
Fish and Shellfish: Purchasing to Preparation - Articles


Health Benefits

Omega-3 Fatty Acids

Omega-3 fatty Acids are involved in the cellular mechanics of every cell in the human body. We can’t make them in our body, so they are called essential fatty acids. The strongest evidence of their benefit is in resolving the inflammation associated with diabetes, Alzheimer’s disease, cancer, and cardiovascular disease. They also help manage blood pressure, lower triglycerides, increase the healthy HDL cholesterol, reduce the risk of fatal heart attack, improve circulation, and aid the function of statin medications. In maternal health, Omega-3 fatty acids reduce preterm birth and postpartum depression, and are essential for child and adolescent health and vision. The recommendation of Omega-3 fatty acids (EPA + DHA) supported by major health organizations is 250 to 500 milligrams a day. Most Americans consume less than 80 to 100 milligrams a day.

Vitamin D

Oily fish is a good source of vitamin D; for example, 3 ounces of salmon supplies 477 IU, while 3 ounces of tuna supplies only 68 IU. The RDA for vitamin D is 600 IU for ages one to 70. Vitamin D is an important nutrient for calcium absorption for strong bones, and healthy gums, muscles and immune system. Fish also offers high-quality protein.

Only 10 percent of Americans are eating the recommended 8 ounces of fish and shellfish per week (for children, 3.5 to 7 ounces per week). Below are the averages of what we are eating in the United States:

  • Men: 5 ounces per week
  • Women: 3 to 4 ounces per week
  • Children: 1 to 2 ounces per week

All are meeting only 33 to 50 percent of recommendations.

Top 10 Consumed Fish and Shellfish in the United States

  • Shrimp (25%)
  • Salmon (18.5%)
  • Tuna (14%)
  • Tilapia (9%)
  • Alaskan Pollock (6%)
  • Pangasius (5%)
  • Cod (4%)
  • Crab (3.5%)
  • Catfish (3%)
  • Clams (2%)

Omega-3s in Fish (per 3 ounces)

Tuna (Albacore, canned)2,150 mg
Anchovies1,850 mg
Salmon717–1,533 mg
Oysters (Pacific)1,400 mg
Trout1,160 mg
Cod253 mg
Haddock203 mg
Catfish and tilapia64 mg

Examine Your Choices

FoodSourceWhat I buyWhat I plan to buy/change
ProteinOmega-3HamburgerCanned salmon

My goal: Offer fish or shellfish twice a week.

Concerns: Mercury and PCBs

Mercury is a heavy metal that accumulates in the environment mainly from fossil fuel burning. It accumulates in rivers, streams, lakes, and the oceans. Smaller fish and shellfish have lower levels, while bigger fish have higher levels due to eating many smaller fish. The highest levels of mercury are found in big, long-lived predator fish. Mercury damages major organs and causes irreversible brain damage in developing fetuses and infants. Avoid king mackerel, marlin, shark, orange roughy, swordfish, tilefish (Gulf of Mexico), and bigeye tuna.

Polychlorinated biphenyls (PCBs) can also be a contaminant in fish caught from local waters in some areas. If you eat fish caught by family or friends, check for (state) fish advisories. If there are no advisories, limit number of servings to one, and consume no other fish that week.


The National Oceanic and Atmospheric Administration, which is responsible for overseeing U.S. aquaculture, reports:

  • Aquaculture supplies more than 50 percent of seafood consumed in the United States.
  • About 90 percent of U.S. seafood is imported; half of that is produced by aquaculture.
  • U.S. aquaculture meets only 5 to 7 percent of U.S. demand for seafood.

The Marine Stewardship Council (MSC) is an international nonprofit organization established to address the problem of unsustainable fishing. With its blue fish and check logo, the MSC is the largest and most globally recognized eco-label for wild-caught seafood. Its standards meet the United Nations’ eco-labeling guidelines. To obtain the MSC seal of approval, a fishery must demonstrate effective management and maintain healthy populations and ecosystems. To ensure farmed-raised fish meet the standards for best feeding, holding, and health practices, check the Aquaculture Stewardship Council website . The Environmental Defense Fund Seafood Selector also provides good comparisons for wild and farmed fish.


Deep frying adds the most calories, with extra carbs from breading or batter and oil, so fish prepared this way should be consumed less often. Pan sautéing without breading will have less oil absorbed and more opportunity for adding more flavor, such as with a sauce or herbal seasonings. Eating fish skin is optional; it can be left on while cooking to help hold the fish together. “Air fryers,” which are stove-top convection ovens, are not recommended since they dry out the fish very quickly.

Broiling fish for 3 to 5 minutes is a very quick preparation method, and can add a nice crispy texture without adding fat.

Poaching is a good choice for any fish. For example, sauté onions, garlic, shallots, chives, or dill and peppercorns; add a liquid, such as dry white wine, fish stock, or vegetable stock; and simmer (do not boil; it will overcook fish). Most will cook in 10 to 12 minutes.

Soups and stews are a popular choice, especially for shellfish. For a lower-calorie cream base, try evaporated skim milk instead of cream and butter. Vegetable stocks and tomato sauces are also healthy choices.

Grilling fish for 3 to 6 minutes is another very quick cooking method. Higher-fat fish is a better choice for grilling since it is less likely to dry out. Lightly spread an acidlike lemon or lime juice, seasoning such as oregano or thyme, and olive oil on the fish. Grill undisturbed for 2 minutes, and give a quarter turn to leave the grill marks. Grill for 2 to 4 more minutes until the fish reaches 145°F.

Baking fish is a good option, especially if you want to save time and make a whole meal, as with packet cooking. Packet cooking includes layering starchy vegetables as a base, then adding fish and tender vegetables and seasonings, wrapping in foil, and baking.


Academy of Nutrition and Dietetics

American Heart Association

American Psychiatric Association

Cladis, D., A. Kleiner, H. Freiser, and C. Santerre. “Fatty Acid Profiles of Commercially Available Finfish Fillets in the United States.” Lipids 49, no 10 (2014): 1005–1018.

National Oceanic and Atmospheric Administration

Office of Disease Prevention and Health Promotion. “2015–2020 Dietary Guidelines for Americans.”

U.S. Environmental Protection Agency

U.S. Food and Drug Administration, " Eating Fish: What Pregnant Women and Parents Should Know. "

Prepared by Lynn James, senior extension educator.