# item.guide
Side-by-Side Comparison Fish & Seafood

Atlantic Mackerel vs. Yellowfin Tuna (Fresh Ahi Steak)

Comparing 2 standards across 9 specifications. 9 key differences identified.

Comparing:
Atlantic Mackerel
Yellowfin Tuna (Fresh Ahi Steak)

Atlantic mackerel (Scomber scombrus) is an oily pelagic fish. Per 100g raw, it provides 205 kcal, 18.6g protein, 13.9g healthy fats (3.3g saturated), an extraordinary 2,590mg Omega-3 (EPA+DHA), and exceptionally low mercury.

View full Atlantic Mackerel spec sheet →

Fresh Yellowfin tuna (Thunnus albacares) is a lean predatory pelagic fish. Per 100g raw, it provides 109 kcal, 24.4g protein, 0.49g fat, and 240mg Omega-3 with dense myoglobin creating deep red sashimi-grade steaks.

View full Yellowfin Tuna (Fresh Ahi Steak) spec sheet →

Specification Comparison Table

9 Parameters
Parameter / Spec
Energy / Calories
205 kcal 109 kcal
Protein
18.6 g 24.4 g
Total Fat
13.9 g 0.49 g
Omega-3 (EPA + DHA)
2,590 mg 240 mg
Saturated Fat
3.30 g 0.13 g
Cholesterol
70.0 mg 39.0 mg
Mercury Level
Very Low (< 0.05 PPM - Atlantic Scomber species) Moderate (~0.35 PPM)
Potassium
314 mg 444 mg
USDA Safe Internal Temp
63°C (145°F) 63°C (145°F) (Rare-seared ahi, ~46°C/115°F, is common but below the FDA-recommended minimum -- relies on the fish being sushi/sashimi-grade and previously frozen to control parasites, which does not address bacterial safety)