Seafood Protein Guide: Which Fish Has the Most Protein?

July 19, 2020

Seafood Protein Guide: Which Fish Has the Most Protein?

Seafood is one of the best protein sources available — not just because of the protein content per serving, which is competitive with chicken and beef, but because of what comes with that protein. Fish and shellfish deliver complete protein (all essential amino acids), omega-3 fatty acids, vitamin D, B12, selenium, and zinc in a package that is lower in calories and saturated fat than most other animal proteins. No other protein source provides this combination.

This guide covers the protein content of the most common fish and shellfish, why seafood protein is nutritionally superior to most alternatives, how much protein you actually need, and which specific seafood to choose depending on your goals.

🔗 Tuna  |  🔗 Salmon  |  🔗 Halibut  |  🔗 King Crab

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Protein Content in Seafood: The Complete Table

All values are per 3 oz (85g) cooked serving. Protein content varies slightly by preparation method; values below are for simply cooked (steamed, baked, or grilled) with no added ingredients.

Seafood	Protein (3 oz)	Calories (3 oz)	Fat (3 oz)
Tuna (Yellowfin/Ahi)	26g	~110	~1g
Scallops	27g	~95	~1g
Salmon (Sockeye)	24g	~130	~5g
Pacific Halibut	23g	~95	~2g
Shrimp	21g	~85	~1g
Rockfish	21g	~93	~1g
Ocean Perch	21g	~100	~2g
Haddock	21g	~95	~1g
Dungeness Crab	20g	~85	~1g
Pacific Cod	20g	~90	~1g
Flounder/Sole	19g	~100	~1g
King Crab	16g	~82	~1g
Lobster	17g	~83	~0.5g
Swordfish	16g	~103	~3g

Key takeaway: Scallops and tuna are the highest-protein seafood options per serving. Salmon delivers slightly less protein than tuna but significantly more omega-3 fatty acids. King crab and lobster are lower in protein per ounce than most fish, but they are also the lowest in calories and fat of any animal protein — making them excellent choices for high-protein, low-calorie eating.

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Why Seafood Protein Is Nutritionally Superior

Protein content alone does not tell the full story. The reason seafood protein is considered superior to most other protein sources is what comes with it.

Complete Protein with All Essential Amino Acids

Fish and shellfish are complete proteins — they contain all nine essential amino acids that the human body cannot synthesize on its own. This is true of all animal proteins, but it is worth noting because many plant proteins are incomplete (missing one or more essential amino acids), which is why vegetarians and vegans need to combine protein sources carefully. With seafood, you get complete protein in every serving without any planning required.

Omega-3 Fatty Acids: The Protein Bonus

No other protein source provides meaningful amounts of EPA and DHA — the long-chain omega-3 fatty acids that are essential for cardiovascular health, brain function, and inflammation reduction. Chicken provides almost none. Beef provides almost none. Eggs provide small amounts. Fatty fish — salmon, tuna, sablefish, mackerel — provide 500–2000mg of EPA+DHA per serving, which is the range associated with measurable health benefits in clinical research.

This is the most important nutritional advantage of seafood protein over other animal proteins: you get the protein you need and the omega-3s that most Americans are significantly deficient in, in a single food.

Micronutrient Density

Seafood protein comes packaged with micronutrients that most other protein sources provide in smaller amounts:

• Vitamin D: Fatty fish (salmon, tuna, sablefish) are among the few significant dietary sources of vitamin D. Approximately 40% of American adults are vitamin D deficient.
• Vitamin B12: Fish and shellfish are excellent sources. Lobster provides ~50% DV per serving; tuna provides ~100% DV per serving.
• Selenium: Tuna provides ~100% DV per serving; salmon provides ~60% DV. Selenium is an antioxidant and essential for thyroid function.
• Zinc: Crab and oysters are the best dietary sources of zinc available. King crab provides ~43% DV per serving; Dungeness crab provides ~40% DV.
• Iodine: Seafood is one of the primary dietary sources of iodine, which is essential for thyroid hormone production.

Protein Efficiency: More Protein Per Calorie

Seafood delivers more protein per calorie than most other animal proteins. A 3-oz serving of tuna provides 26g of protein at 110 calories. The same 110 calories of chicken breast provides approximately 20g of protein. The same 110 calories of 80/20 ground beef provides approximately 9g of protein. For people managing calorie intake while trying to meet protein goals, seafood is the most efficient animal protein available.

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How Much Protein Do You Actually Need?

The Recommended Dietary Allowance (RDA) for protein is 0.8g per kilogram of body weight per day — approximately 0.36g per pound. For a 150-lb adult, that is approximately 54g of protein per day. This is the minimum required to prevent deficiency, not the optimal amount for health and performance.

The research on optimal protein intake consistently points to higher amounts than the RDA:

• For general health and muscle maintenance: 1.0–1.2g per kilogram (0.45–0.55g per pound). For a 150-lb adult: 68–82g per day.
• For active adults and athletes: 1.4–2.0g per kilogram (0.64–0.91g per pound). For a 150-lb adult: 96–136g per day.
• For adults over 65: 1.0–1.2g per kilogram to counteract age-related muscle loss (sarcopenia). Protein needs increase with age, not decrease.
• For pregnant women: An additional 25g per day above baseline requirements.

The practical implication: two 6-oz servings of tuna per week (as recommended by the American Heart Association for fish consumption) provides approximately 104g of protein from those two meals alone — a substantial contribution to weekly protein goals, along with the omega-3s, vitamin D, B12, and selenium that no other protein source provides in the same amounts.

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Which Seafood to Choose for Your Protein Goals

Maximum Protein Per Serving: Tuna or Scallops

Yellowfin (Ahi) tuna and scallops are the highest-protein seafood options. A single 8-oz tuna steak provides approximately 56g of protein at under 300 calories — more than half the daily protein requirement for most adults in a single meal. Tuna is also the highest in selenium and B12 of any common seafood. For people specifically targeting protein intake, tuna is the optimal choice.

Best Protein-to-Fat Ratio: Halibut or Cod

Pacific halibut provides 23g of protein per 3-oz serving at approximately 95 calories and only 2g of fat. Pacific cod provides 20g of protein at 90 calories and less than 1g of fat. Both are excellent choices for people who want high protein with minimal fat — leaner than salmon, milder in flavor than tuna, and extremely versatile in the kitchen.

Best Protein with Omega-3s: Salmon

Salmon provides 24g of protein per 3-oz serving along with 1,500–2,000mg of EPA+DHA omega-3s — the highest omega-3 content of any commonly available fish. For people who want both protein and omega-3s in a single food, salmon is the optimal choice. Sockeye salmon has the highest omega-3 content of the Pacific salmon species; King (Chinook) salmon has the highest fat content and the richest flavor.

Best Protein for Low-Calorie Eating: Lobster or Crab

Lobster and King crab are the lowest-calorie animal proteins available — approximately 82–83 calories per 3-oz serving, with less than 1g of fat. They are lower in protein per ounce than tuna or salmon, but they are also lower in calories, making them the most protein-dense option by calorie count. For people on a strict calorie budget who want to maximize protein intake, lobster and crab are excellent choices — as long as you go easy on the drawn butter.

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Shop High-Protein Seafood

• 🔗 Yellowfin (Ahi) Tuna — 26g protein per 3 oz; highest selenium and B12
• 🔗 Wild Pacific Salmon — 24g protein per 3 oz; highest omega-3 content
• 🔗 Pacific Halibut — 23g protein per 3 oz; lean, mild, versatile
• 🔗 Pacific Cod — 20g protein per 3 oz; leanest white fish
• 🔗 King Crab Legs — 16g protein per 3 oz; lowest calorie animal protein
• 🔗 Lobster Tails — 17g protein per 3 oz; 0.5g fat; exceptional protein efficiency

🎥 Watch seafood cooking tutorials on the Global Seafoods YouTube Channel

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FAQs: Protein in Seafood

Q1: Which seafood has the most protein per serving?

Scallops (27g per 3 oz) and Yellowfin tuna (26g per 3 oz) are the highest-protein seafood options. Salmon (24g), halibut (23g), and shrimp (21g) follow closely. Among shellfish, Dungeness crab (20g) and shrimp (21g) are the highest. King crab (16g) and lobster (17g) are lower in protein per ounce than most fish, but they are also the lowest in calories and fat of any animal protein, making them highly efficient protein sources by calorie count.

Q2: Is seafood protein better than chicken protein?

For pure protein volume, chicken breast has a slight edge — approximately 35g per 4-oz serving vs. 28–35g for most fish. But seafood protein comes with nutritional advantages that chicken cannot match: omega-3 fatty acids (5–10x more than chicken), vitamin D (dramatically more), vitamin B12 (significantly more in most species), and selenium (2–3x more). For people eating protein specifically for health outcomes — cardiovascular health, brain function, inflammation reduction — seafood is the superior choice. For maximum protein volume per serving, chicken has a slight edge. The practical recommendation: eat both, with at least two seafood servings per week.

Q3: How much protein do I get from a full lobster or crab dinner?

A 2-lb whole lobster yields approximately 6–9 oz of edible meat, providing 34–51g of protein. A lobster tail ranges from 4–8 oz of meat depending on size, providing 23–45g of protein. For crab: 3 lbs of King crab legs yields approximately 1.5–2 lbs of edible meat, providing approximately 120–160g of protein across the full portion (though most people eat less than this in a single sitting). A single Dungeness crab (approximately 2 lbs whole) yields approximately 8–10 oz of edible meat, providing 45–57g of protein.

Q4: Is canned tuna as high in protein as fresh tuna?

Yes — canned tuna retains essentially all of the protein of fresh tuna. A standard 5-oz can of tuna (drained) provides approximately 33–42g of protein, depending on the species (Albacore is slightly higher in protein than light/skipjack tuna). Canned tuna is one of the most cost-effective high-protein foods available. The main nutritional difference between canned and fresh tuna is omega-3 content: canned tuna packed in water retains more omega-3s than canned tuna packed in oil, and fresh tuna has slightly higher omega-3 content than canned. For protein specifically, canned and fresh are essentially equivalent.

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