I just wanted to chime in again to say our kitties LOVE the c/d canned! It has a high fat content, so IF your cats like wet food, they do tend to like the c/d - just feed less of it or you'll notice him getting heavier. I usually feed only the chicken, but when Carolina had some extra seafood, I took her up on the offer, and they loved it too.
Now that they're on the all wet diet, I do feed them all the other wet foods I've incorported (Instinct, Evo, Wellness Chicken, Holistic, Before Grain) - but I still give them one wet meal of c/d day.
Also, for Tuxie, who wouldn't switch to all wet, I give him a mix of dry food that is about 70% c/d dry, with Instinct (chicken) dry, Before Grain (chicken) dry, and Origen (10% each) mixed in.
My understanding is that if I switch him to an all grain free dry we may have problems with his bladder/crystals again - but I wanted it higher quality than just the c/d dry. We've been doing this since November, and all seems well so far (and Lazlo, Tuxedo, and Shelly ALL had problems with crystals), and Spooky has idiopathic cystitis, although no flare-ups for.... two years now.

I think this was already said... but just avoid the fish. I think a little c/d seafood won't hurt - but I don't know if it's worth the risk. It is OK from time-to-time for my gang - but I know Momofmany and Carolina have kitties that can't manage even just a little bit of it.