Fish has many properties that can help with a cat's skin, heart, kidney, and joint diseases, Dr. Kirk said. Cats particularly love the taste of tuna and salmon.
However, any salmon should be fully cooked and free of bone, and you should only feed it to your cat as an occasional treat since salmon does not provide your cat with enough taurine (an essential amino acid needed in all cats' diets), Dr. Ochoa said. Similarly, any raw, cooked, or canned tuna (only feed your cat tuna canned in water, not brine or oil) should only be fed in moderation and not as a primary diet, since tuna fish doesn't provide all the nutrients needed to maintain your cat's health. "Too much raw tuna can also lead to a thiamine deficiency," Dr. Ochoa said.