Oct 09, 2019 · A typical serving size of fish can range from 3 to 6 ounces, depending on the type of fish and its preparation. The American Heart Association considers 3.5 ounces of cooked fish, or about 3/4 cup, to be a single serving. A can of tuna contains about 5 ounces and lists 2 ounces, or 1/4 cup, as an appropriate single serving size on the nutrition
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