No. Fish is not a good food for cats. It can cause all kinds of problems from UTI issues to yellow fat disease. Tuna is the worse thing you can feed your cat. Salmon is ok but it should be mixed with chicken or other meat.
She does in moderation as a treat of just a teaspoon of canned tuna packed in spring water. A diet high in fish isn't healthy for cats as it can cause thiamine deficiency.
Eat too much fishes is not good for cats healthy. especially human processd fishes food.
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Fish isn’t always an optimal food for cats. When cats eat a diet that consists primarily of raw fish (not commercially prepared foods that contain fish), they are at risk for developing thiamine deficiency. Symptoms include a loss of appetite, seizures, and possibly death.