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Nutritional Facts for Ahi Vs. Yellowfin Tuna

By Jae Allen

Two types of tuna fish are commonly sold as "ahi" tuna. These are yellowfin tuna and bigeye tuna. Yellowfin tuna are fished in most areas of the world, apart from the Mediterranean Sea. Bigeye tuna are caught in cool, deep waters of the Pacific Ocean. Bigeye has a higher fat content, but is preferred over yellowfin by sashimi connoisseurs. Consult your doctor before making significant dietary changes.

Yellowfin Tuna Nutritional Facts

Raw yellowfin tuna contains 109 calories in every 100 g, or 3.5 oz. serving. The fish is virtually fat-free, with only 0.5 g of fat per serving. There are 24.4 g. of protein in 100 g of uncooked yellowfin, but no carbohydrates, sugars or dietary fiber. When yellowfin tuna is cooked over a dry heat, it contains 130 calories and 29.2 g. of protein in every 100 g serving. The water loss associated with dry-heat cooking is the reason for this change in nutrient composition.

Bigeye Tuna Nutritional Facts

A 100 g, or 3.5 oz., serving of cooked bigeye ahi tuna contains 108 calories. The protein content of bigeye ahi is 24 g. There are no carbohydrates including dietary fiber or sugar present in the bigeye tuna flesh, but there are 45 mg of cholesterol in every 100 g of cooked fish. The same portion contains 40 mg of sodium, roughly 1 percent of the recommended daily adult intake.

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Fat and Cholesterol

Both types of tuna are low-fat foods. A cooked 100 g serving of bigeye ahi contains 2 g of fat, while the same portion of cooked yellowfin tuna typically contains 0.6 g of fat. However, the overall fat content of yellowfin tuna becomes higher as the size of the individual fish increases. For larger fish, bigeye ahi tuna may be significantly lower in fat The cholesterol content of bigeye ahi tuna is very slightly less than that of yellowfin, with 45 mg per 100 g serving instead of yellowfin's 47 mg.

Use in Japanese Cuisine

Both sushi and sashimi are fish-based Japanese dishes. Sushi refers to sliced fish, usually raw, wrapped in or served over sushi rice. Sashimi is made up of only the fish, usually raw, and cut in very thin slices. Bigeye ahi tuna is preferred over yellowfin for use in sashimi and sushi dishes. This is because yellowfin perishes more quickly than bigeye ahi tuna. The slightly richer, deeply-colored flesh of raw bigeye ahi results in a price premium for bigeye over yellowfin tuna for sushi and sashimi.

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