Salmon vs. Tuna: Which is Healthier?

Salmon vs. Tuna: Which Is Healthier?

Salmon and tuna are two of the most popular fish in the world — both nutritious, both delicious, and both staples of healthy diets globally. But when it comes to nutrition, they're quite different. Here's a complete side-by-side comparison to help you choose the right fish for your health goals.

Nutritional Comparison (Per 3 oz / 85g Cooked Serving)

Key Differences Explained

Omega-3 Fatty Acids — Salmon Wins by a Wide Margin

This is the biggest nutritional difference between the two. Salmon contains dramatically more omega-3 fatty acids than tuna — approximately 1,800mg per serving for sockeye vs. 230mg for yellowfin tuna. Omega-3s (EPA and DHA) are essential for heart health, brain function, reducing inflammation, and supporting mental wellbeing. If omega-3 intake is your primary goal, salmon is the clear winner.

Protein — Tuna Edges Ahead

Tuna is slightly higher in protein — 24g per serving vs. 22g for salmon — with virtually no fat. This makes Ahi tuna the top choice for lean, high-protein diets focused on muscle building or weight loss.

Calories & Fat

Tuna is lower in calories (109 vs. 133) and significantly lower in fat (0.6g vs. 5.4g). However, salmon's fat is almost entirely healthy unsaturated fat — the same type that makes olive oil heart-healthy. The extra calories in salmon come with significant nutritional benefits, not empty energy.

Vitamin D — Salmon Wins

Salmon is one of the best natural sources of Vitamin D available — providing 70% of the daily value per serving vs. 20% for tuna. Vitamin D deficiency is widespread, making salmon a particularly valuable dietary choice for bone health and immune function.

Selenium — Tuna Wins

Tuna leads on selenium (60% DV vs. 40% DV for salmon) — a powerful antioxidant that supports thyroid function and immune defense.

Mercury — Salmon Is Safer

Mercury is where salmon has a clear advantage:

• Salmon: FDA classifies as “Best Choice” — safe to eat 2–3 times per week for most adults, including pregnant women.
• Yellowfin Tuna (Ahi): FDA classifies as “Good Choice” — safe for most adults at 1 serving per week; pregnant women and young children should limit intake.
• Albacore Tuna: Also “Good Choice” — similar guidance to yellowfin.
• Bigeye Tuna: FDA classifies as “Avoid” for pregnant women and young children due to higher mercury.

Which Is Better for Specific Goals?

• For omega-3s & heart health: Salmon — by a wide margin.
• For lean protein & weight loss: Tuna — more protein, fewer calories, virtually no fat.
• For vitamin D: Salmon — one of the best natural sources available.
• For mercury safety: Salmon — lower mercury, can be eaten more frequently.
• For muscle building: Either — both are complete protein sources; tuna has a slight edge on protein density.
• For pregnant women: Salmon — lower mercury and higher omega-3s (DHA) support fetal brain development.

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Conclusion

Both salmon and tuna are outstanding choices for a healthy diet — the best one depends on your specific goals. Salmon wins on omega-3s, vitamin D, and mercury safety; tuna wins on lean protein and calorie efficiency. Ideally, include both in your diet regularly. 🔗 Shop our wild-caught salmon collection and 🔗 sushi-grade Ahi tuna — both delivered frozen to your door at peak freshness.

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FAQ: Salmon vs. Tuna

Q1: Which has more omega-3s — salmon or tuna?

Salmon has dramatically more omega-3 fatty acids — approximately 1,800mg per serving for sockeye vs. 230mg for yellowfin tuna — nearly 8x more. Salmon's omega-3s are primarily EPA and DHA, the most bioavailable forms that directly support heart health, brain function, and inflammation reduction. If maximizing omega-3 intake is your goal, salmon is the clear choice. Among tuna species, albacore has more omega-3s than yellowfin, but still significantly less than salmon.

Q2: Is salmon or tuna better for weight loss?

Tuna is slightly better for strict calorie-controlled diets — lower in calories (109 vs. 133 per 3 oz) and higher in protein (24g vs. 22g), with virtually no fat. The higher protein content promotes satiety and preserves muscle mass during calorie restriction. However, salmon's healthy fats also promote satiety and support hormonal balance, which can aid weight management. Both are excellent high-protein, low-carb options — the difference is small enough that personal preference and preparation method matter more than the calorie gap.

Q3: Which fish is lower in mercury?

Salmon is significantly lower in mercury — FDA classifies it as a “Best Choice” (safe to eat 2–3 times per week for most adults). Yellowfin tuna (Ahi) is a “Good Choice” (1 serving per week for most adults). Albacore tuna is also “Good Choice.” Bigeye tuna is classified as “Avoid” for pregnant women and young children. Wild-caught Alaskan salmon consistently tests among the lowest mercury levels of any seafood.

Q4: Is salmon or tuna better for pregnant women?

Salmon is the better choice during pregnancy — lower mercury and significantly higher omega-3s (DHA) that support fetal brain and eye development. The FDA recommends 2–3 servings of low-mercury seafood like salmon per week during pregnancy. Yellowfin tuna can be consumed in moderation (1 serving/week), but bigeye tuna should be avoided entirely during pregnancy. Wild-caught sockeye or king salmon is the ideal pregnancy seafood choice.

Q5: Which is better for muscle building?

Both are excellent for muscle building — both provide all essential amino acids (complete proteins). Tuna has a slight edge with 24g protein vs. 22g for salmon per 3 oz serving, and is lower in calories — making it the top choice for lean bulking or cutting phases where calorie precision matters. Salmon's healthy fats support testosterone production and reduce exercise-induced inflammation, which can aid recovery. For overall athletic performance, alternating between both is the optimal strategy.

Q6: Can I eat both salmon and tuna regularly, or should I choose one?

You can and should eat both regularly — they complement each other nutritionally. A practical approach: eat salmon 2–3 times per week for omega-3s, vitamin D, and mercury safety; eat yellowfin tuna 1 time per week for lean protein and selenium. This gives you the benefits of both without exceeding mercury guidelines for either. Variety in seafood consumption also ensures a broader range of micronutrients and reduces the risk of overexposure to any single contaminant.