Boiled fish for cats

When my cat got sick (kidney problems) due to dry kibbles, my vet told me that I can consider giving him boiled fish. However, it is important to note that the fish should be fresh water because saltwater kinds of fish are high in creatinine. Some of the fresh water fish that you can give your cats are:

1. Milkfish
2. Tilapia
3. Carp
4. Trout
5. Salmon

My cats love salmon. But most of the time I feed them with raw food (beef/chicken meat and liver plus egg and squash

Thank you for the helpful information.