It doesn't list the ingredients. Hope there is no fish added!I purchased this food, which is natural and complete:
Lily’s Kitchen Tasty Cuts in Gravy Cat Food Chicken | Pets
I'm going to try and slowly introduced it, and see how he goes. He loves chicken as it's his favourite meat. He hates fish though and runs away from anything with fish. (The salmon oil I plan to introduce will be deep hidden in the food so hopefully he won't smell it)
I'll let you know how he goes.