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When it comes to seafood, tuna stands out as one of the most protein-rich options. Among the different varieties of tuna, chunk light tuna offers lower mercury levels due to its smaller catch size, albeit with less protein—about 18 grams per 3-ounce serving compared to 26 grams in larger yellowfin tuna. For those concerned about mercury content but still wanting to maximize protein intake, the "Safe Catch" brand at Costco is an excellent choice, as it provides low mercury, high-protein yellowfin tuna tested for safety.