What is the safe amount of tuna that can be fed to cats?

The safe amount of tuna that can be fed to cats is in moderation, as a treat, and not as a regular part of their diet. Tuna should not make up more than 10 of a cat's total food intake to avoid potential health issues from Mercury and nutrient imbalances. It is recommended to consult with a veterinarian for specific guidance on feeding tuna to cats.