Your cat’s diet should be based around an excellent cat food, but it is possible to give your cat treats from your own diet. There are foods that are nutritional for your cat that you likely snack on yourself!
The omega-3s in fish are wonderful for your cat, as they are for you. These will be of benefit to your cat’s eyes, to reduce arthritis, reduce the risk of heart issues, and reduce the risk of kidney disease. While you may like sushi, it is not recommended for your cat, though cooked or canned fish is just fine.