First, don't mix dry and wet food. You're going to end up contaminating the dry food. Second, don't panic. Cats go through phases like that. It's normal, and it probably won't last. One possible explanation is that your cat may have a slightly stuffy nose. They rely on scent to a great extent, and fish smells much stronger than chicken.
Also, when you say he won't eat anything but fish, how many other foods have you tried? If the answer is less than a dozen or so, all you can really say is that those foods that you've tried, he doesn't like. That said, one of my three is a big-time fish lover too. So she ends up getting fish maybe 50% of the time, which is much more often than I'd like, but it's a compromise between what she wants to eat and what I want to feed her. One possible solution to this is that there are many flavors of catfood that feature both seafood and chicken/turkey/duck in the same dish. Definitely give those a try.
Feeding cats can be an exasperating experience sometimes. You should be glad that he has *a* food that he loves right now. But keep trying others. Buy small quantities of other things and try try try. Other brands, other flavors etc. Sometimes a cat will have a ton of enthusiasm for a brand/flavor of food that you don't consider to be quite as nutritionally good as another, but it's often worth making that compromise and at least adding that food to the "rotation", just because it's great to have some "go-to" foods when you're cat is being picky. Mine almost never gets the same dinner on consecutive days, and frequently I'll split their dinner between two different foods, some seafood and some fowl. Of course that is a bit easier to do when you have multiple cats, but you could still do the same thing by refrigerating leftovers.
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