Tuna vs Mahi Mahi – What’s The Difference? Let’s Compare

Tuna and Mahi Mahi have amazing nutritional value and in some ways are similar. For this reason many people ask about their differences. Let’s answer the question, what is the difference between tuna and Mahi Mahi?

Tuna and Mahi Mahi are different species from different families. Mahi Mahi colors are electric green and yellowish while tuna is blueish and silvery. Tuna has a stronger taste and fishier flavor than the mild to sweet tasting Mahi Mahi. Tuna contains more B vitamins, minerals and protein than Mahi Mahi. 

This article will compare their tastes, textures, cooking methods, costs, mercury levels and whether one can substitute for the other in recipes. In addition, I’ll do a side-by-side comparison of their nutrients, habitats, size, weight and more.

Tuna and Mahi Mahi Nutritional Value

The following table is a side-by-side comparison of all the nutrients in tuna and Mahi Mahi:

Nutrient Tuna, raw (4 Ounces) Mahi Mahi, raw (4 Ounces)
Calories 124 96
Fat 0.6 g 0.8 g
Saturated Fat 0.2 g 0.2 g
Cholesterol 44 mg 83 mg
Protein 28 g 21 g
Omega-3 0.12 g 0.13 g
B-6 1.0 mg 0.4 mg
B-12 2.3 mcg 0.6 mcg
Thiamin 0.10 mg 0.02 mg
Riboflavin 0.10 mg 0.07 mg
B5 0.2 mg 0.8 mg
Niacin 20.9 mg 6.9 mg
Folate 2.2 mcg 5.6 mcg
Iron 0.8 mg 1.2 mg
Potassium 500 mg 471 mg
Magnesium 39 mg 34 mg
Phosphorus 315 mg 162 mg
Calcium 4.5 mg 17.0 mg
Zinc 0.4 mg 0.5 mg
Selenium 102.7 mcg 41.3 mcg

Nutrient sources 1 2 3

Both fish contain a wide variety of similar nutrients. Tuna contains more of some nutrients while Mahi Mahi contains more of others. Therefore, is tuna healthier than Mahi Mahi?

Tuna is healthier than Mahi Mahi due to its higher percentage of B vitamins and minerals. Tuna contains more protein, less cholesterol and fat than Mahi Mahi. Tuna provides a higher percentage of B6, B12, thiamin, riboflavin, niacin, potassium, magnesium, phosphorus and selenium than Mahi Mahi.

Mahi Mahi is no slouch either and is very healthy. Mahi Mahi provides a higher percentage of B5, folate, iron, calcium and zinc. Both fish provide almost the same amount of heart healthy omega-3 fatty acids.

Keep reading because the next section explains why omega-3s are important for health.

Tuna and Mahi Mahi Health Benefits

Both fish provide the same nutrients and therefore the same benefits. Although I broke down the benefits by which fish offers the higher percentage of each nutrient 4. Since omega-3 fatty acids are similar, I’ll start with them.

Omega 3 Fatty Acids

Tuna provides 0.12 grams of omega-3 and Mahi Mahi 0.13 grams per four ounces raw. Why does omega-3 fatty acids matter so much?

It’s because omega-3 fatty acids are heart healthy and help keep arteries healthy. The omega-3s in tuna and Mahi Mahi may help with the following:

  • Keeping bad cholesterol low.
  • Keeping good cholesterol high.
  • Reducing inflammation.
  • Reducing plaque build-up.
  • Lowering triglycerides
  • Help keep the heart rhythms more normal.

DHA and EPA, two of the fatty acids, are associated with lowering blood pressure and improving the health of blood vessels 5.

Studies suggest omega-3s can help reduce joint pain and stiffness in people with rheumatoid arthritis. They may also boost the effectiveness of anti-inflammatory drugs.

Tuna Health Benefits

B Vitamins

Of the seven B vitamins listed in the table above, tuna contains more of five of them. The B vitamins in the table include B6, B12, B5, B1 (thiamin), B2 (riboflavin), B3 (niacin) and B9 (folate). B vitamins help support the following:

  • Cardiovascular disease
  • Red blood cells
  • Digestion
  • Energy levels
  • Brain function
  • Nerve function


Tuna contains 102.7 mcg of selenium per four ounces and Mahi Mahi 41.3 mcg. Selenium is an underreported nutrient. I’m unsure why many don’t write about it more because studies 6 show selenium may help to protect the following:

  • Heart disease
  • Thyroid
  • The immune system
  • Cognitive issues


Tuna contains 500 mg per four raw ounces and Mahi Mahi 471 mg. Since the recommended daily amount is 4,700 mg, they both provide an excellent number.

Potassium is beneficial for reducing sodium intake. It helps the body reduce fluids and rids excess sodium 7. This process helps to reduce blood pressure.

The more potassium you consume, the more sodium your body will lose. Consuming too much sodium or not enough potassium throws off the delicate balance the kidneys need to remove the excess water 8.

According to Harvard Health, a number of studies have shown a connection between low potassium levels and increased blood pressure 9.


Tuna provides 39 mg and Mahi Mahi 34 mg per four ounces. Adding magnesium to your diet could be instrumental in improving sleep related issues like insomnia. Magnesium relaxes and calms the whole body including the blood vessels 10.

More so, it helps keep blood pressure levels balanced and stable. A recent study researched 22 studies and concluded magnesium supplementation decreased diastolic and systolic blood pressure 11.

Magnesium in tuna helps control muscle and nerve function, blood sugar and blood pressure. In the muscles and heart, magnesium competes with calcium to help the muscles relax after contracting.

When the body is low in magnesium, calcium can over stimulate the heart muscle’s cells causing a rapid or irregular heartbeat.


Tuna provides 315 mg and Mahi Mahi 162 mg of phosphorus per four ounces. Tuna provides almost double the number. Phosphorus has been shown in studies to may help the following:

  • Muscle contraction.
  • Muscle recovery after exercise.
  • Promoting healthy nerve conduction.
  • Promote bone and teeth strength.
  • Aids the kidneys in waste removal.
  • Help the body manage and store energy.

If you’re wondering how Mahi Mahi compared to cod, check out my article, Cod vs Mahi Mahi – What’s The Difference? Let’s Compare.

Mahi Mahi Health Benefits


Mahi Mahi provides 17 mg of calcium per four ounces and tuna 4.5 mg. Calcium is important for blood pressure and the heart.

Harvard Health reports calcium helps maintain blood pressure because it helps to control the relaxing and tightening of blood vessels 12. Calcium also helps the following:

  • Build and maintain strong bones.
  • Muscles need calcium to function properly.
  • Improve nerve function.

Tuna and Mahi Mahi: Tastes and Textures

One of the most important things people takes into consideration when choosing a fish is its taste. When comparing the two fish, does Mahi Mahi taste like tuna?

Tuna has a stronger and fishier flavor than Mahi Mahi. Mahi Mahi is more mild to sweet and does not taste fishy. If a fishy or meatier taste is desired tuna is better. If a fishy flavor is undesirable, then Mahi Mahi is better. Mahi Mahi has a firmer texture than slightly mushy tuna. 

Tuna has a meaty and mushy texture. It is not flaky. When used as an ingredient in a meal, it adds a creamy flavor and texture. Tuna is also oily but not as much as some other oily fish.

Mahi Mahi taste can range from mild to sweet depending which part of the flesh you’re eating. The darker area has a more pronounced flavor similar to swordfish but not as much. Its firm, moist texture has large flakes.

If you’re wondering how brown trout and rainbow trout differ in taste, check out my article, Rainbow Trout vs Brown Trout – What’s The Difference?

Mahi Mahi and Tuna Substitutions

When preparing recipes for dinner it’s not always possible to locate the type of fish called for. If you have some tuna, you may ask, can I substitute tuna for Mahi Mahi?

Tuna can substitute for Mahi Mahi due to their similar textures although tuna’s flavor is stronger. They both have a firm enough texture allowing similar cooking methods when substituting. Tuna and Mahi Mahi can be grilled, baked, roasted, poached, fried or seared. 

Other tuna substitutes include the following:

  • Salmon
  • Bluefish
  • Black Sea bass
  • Swordfish
  • Salmon steak

The best Mahi Mahi substitutes are:

  • Salmon
  • Striped bass
  • Cod
  • Rainbow trout
  • White Sea bass
  • Tuna

When substituting Mahi Mahi or tuna always stick to the following:

  • Same size and weight.
  • Stick with similar fillets, whole fillet or cross section.
  • Stick with skinless or skin when the recipe calls for one.
  • Texture is more important for certain cooking methods. Like using a firmer texture when grilling 13.

Canned tuna is very popular. Growing up tuna salad on toast was one of my favorite sandwiches. If you planned on using canned tuna but don’t have any available, what can you substitute canned tuna for?

Canned tuna substitutions:

  • Canned pink salmon
  • Canned red salmon
  • Canned sockeye salmon
  • Canned coho salmon

Canned tuna can substitute for canned salmon. Although the taste and color will be different, they can be prepared the same way using equal amounts according to the recipe. The other ingredients and preparation time can remain the same.

How To Cook Tuna

When you think of tuna, chances are you imagine it as canned food used in tuna salad sandwiches. It is easy to pop the can open and add the tuna to any desired meal. You can add canned tuna to the following dinners:

  • Casseroles
  • Pasta
  • Quesadillas
  • Salads
  • Crackers

Fresh tuna steaks are great seared or fried. Sear at high heat, preferably on a grill. Cook until the flesh changes color and is no longer translucent. Be careful not to over cook it, medium rare is best for most people.

Flavor Pairing

  • Soy sauce
  • Olive oil
  • Sauce vierge
  • Honey
  • Cayenne pepper
  • Smoked paprika

How To Cook Mahi Mahi

Searing fresh Mahi mahi is a popular method. Sear on the bottom side to develop the crust then flip over for a few more minutes. Another method is to roast it at 400 degrees until the center is cooked through and the top is golden.

Flavor Pairing

  • Lemon
  • Garlic
  • Olive oil
  • Red pepper flakes
  • Black pepper

If you’re wondering how tuna and salmon differ, check out my article Tuna vs Salmon: Which Is Better?

How Much Does Mahi Mahi and Tuna Cost

The costs for Mahi Mahi or tuna will vary depending on how the fish are caught and where they are sold. When purchasing fish, be sure to check the label to see if it is wild-caught or farm raised.

Therefore, which is more expensive, Mahi Mahi or tuna?

Mahi Mahi is more expensive than tuna. The average cost for wild caught Mahi Mahi is $18.99 per pound while the average cost for wild caught tuna is $14.99 per pound. 

I checked the local Freshdirect online supermarket for the current prices of Mahi Mahi and tuna.

  • Wild Mahi Mahi fillet
    • $18.99 per pound
  • Fresh, wild caught tuna fillet Yellow-fin
    • $7.98 per pound
  • Fresh tuna steak Ahi
    • $10.99 per pound.
  • Fresh tuna steak Yellow-fin
    • $26.00 per pound

Tuna vs Mahi Mahi Mercury Levels

The EPA and The Food and Drug Administration have issued warnings and suggestions regarding mercury levels in fish and how often they should be consumed 14.

They established a list of best fish, good choices and ones to avoid based on their mercury levels. Therefore, does tuna or Mahi Mahi have more mercury?

Tuna and Mahi Mahi have similar levels of mercury. They are both listed on the FDA’s good choices of fish to consume regarding their mercury levels. The recommendation is consuming one serving per week for fish listed as good choices.

Always check with a physician prior to eating new foods or changing your dietary habits.

Tuna vs Mahi Mahi: Habitats, Size, Weight, Appearance?

Are tuna and Mahi Mahi the same?

Tuna and Mahi Mahi are not the same, they are two different species of fish. The average tuna is longer and weighs more than Mahi Mahi. Tuna have a blueish back while Mahi Mahi have an electric green color back. Depending on the species, tuna can live up to 40-50 years and Mahi Mahi up to 5 years. 

Scientific Classifications, Families, Species

Tuna are from:

  • Family: Scombridae
  • Tribe: Thunnini
  • Genus:
    • Allothunnus
    • Auxis
    • Euthynnus
    • Katsuwonus
    • Thunnus

The true tunas belong to the genus thunnus. There are 15 species including bluefin, yellowfin, albacore, bigeye, longtail and more.

Mahi Mahi are from:

  • Family: Coryphaenidae
  • Genus: Coryphaena
  • Species: C. hippurus


  • Tuna inhabit the open waters and live near the coast and offshore. They are found in The Atlantic, Pacific and Indian Oceans, Mediterranean Sea and the Gulf of Mexico.

Mahi Mahi can be found worldwide. Some of the common places include the following:

  • The west coast of North and South America
  • Hawaii
  • The Atlantic coast of Florida and Africa
  • The Gulf of Mexico
  • The Pacific coast of Costa Rica
  • Indian Ocean
  • South China Sea
  • Southeast Asia
  • Caribbean

Approximately one-third of the U.S. Mahi Mahi comes from the Atlantic Ocean, Gulf of Mexico and the Caribbean. The remaining comes from the Pacific Ocean near Hawaii.


  • Tuna have shades of dark blue near the top with silvery to white sides and bottom.
  • Mahi Mahi is an electric greenish blue towards the top. The lower body is goldfish and the tail appears yellowish.


  • Tuna have a round middle that tapers in the front and rear. Their body is long.
  • The Mahi Mahi adult males have a square head while the females have a rounded head. The have about 55-66 dorsal fin rays extending from the head almost to the tail. Their bodies are more compressed.

Size and Weight

  • The average tuna’s weight and size varies greatly depending on the species. Typical adults measure between four and eight feet long. An albacore grows to 79 pounds, yellowfin to 397 pounds and northern bluefin tuna to 1,800 pounds.
  • Mahi Mahi grow an average 39″ in length and weighs 15-29 pounds.


  • The average tuna lives:
    • Atlantic Bluefin tuna lives up to 50 years.
    • Albacore: 9-13 years
    • Bigeye: 5-16 years
    • Pacific bluefin: 15-26 years
    • Longtail: 18 years
    • Yellowfin: 5-9 years
  • Mahi Mahi lives up to 5 years but seldom exceed 4 years.

Species Resources 15 16 17 18 19 20 21 22 23 24 25

Read Next – More Fish vs Fish Articles!

Herring vs Sardines – What’s The Difference? Let’s Compare

Brook Trout vs Brown Trout – Let’s Compare The Differences

White Perch vs White Bass: Which Is Better?

Alaska Pollock vs Atlantic Pollock: Which Is Better?

White Bass vs Striped Bass: The Key Differences


Article Resources: Foods For Anti-Aging follows strict guidelines to ensure our content is the highest journalistic standard. It's our mission to provide the reader with accurate, honest and unbiased guidance. Our content relies on medical associations, research institutions, government agencies and study resources. Learn more by reading our editorial policy.
  1. Nutrition Value: Fish, raw, mahimahi[]
  2. Nutrition Value: Tuna, raw, fresh[]
  3. FDA: Fish, tuna, fresh, yellowfin, raw[]
  4. FDA: Seafood Nutrition Facts[]
  5. National Center for Biotechnology: Marine Omega-3 Supplementation and Cardiovascular Disease[]
  6. National Institutes of Health: Selenium[]
  7. American Heart Association: How Potassium Can Help Control High Blood Pressure[]
  8. National Center for Biotechnology Information: The Effect of the Sodium to Potassium Ratio on Hypertension Prevalence: A Propensity Score Matching Approach[]
  9. Harvard Health: Potassium lowers blood pressure[]
  10. National Institutes of Health: Magnesium[]
  11. National Center for Biotechnology Information: Effect of magnesium supplementation on blood pressure: a meta-analysis[]
  12. Harvard Health: Key minerals to help control blood pressure[]
  13. Sea Grant North Carolina: Fish Flavors and Substitutions[]
  14. FDA: Advice about Eating Fish[]
  15. Wikipedia: Mahi-mahi[]
  16. NOAA Fisheries: Atlantic Mahi Mahi[]
  17. NOAA Fisheries: Pacific Mahimahi[]
  18. Britannica: tuna[]
  19. Wikipedia: Tuna[]
  20. Wikipedia: Albacore[]
  21. NOAA Fisheries: North Atlantic Albacore Tuna[]
  22. NOAA Fisheries: Atlantic Bigeye Tuna[]
  23. NOAA Fisheries: Western Atlantic Bluefin Tuna[]
  24. NOAA Fisheries: Atlantic Yellowfin Tuna[]
  25. NOAA Fisheries: Pacific Bluefin Tuna[]

Kevin Garce

Kevin Garce is a Certified Health Coach who encourages people by informing them on nutrition and food topics important to them. His years of research and knowledge inspire people to achieve their goals. Read more here About Me

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