I am well versed in nutrition for cats and other animals. I like animals a lot. I have adopted 3 cats and 2 dogs. If you do not know how to feed the cat click for source, then give it cats' food. Cats can eat fish, but fish has no beneficial properties for cats. Fish is poorly absorbed by the cat's body. Under no circumstances should you give raw fish to your cat. Raw fish takes a long time to digest in the body, which can cause digestive problems in cats. Raw fish contains certain bacteria that can cause food poisoning in cats.