I have 2 kittties.  Both 2 years old, brothers.  The one literrally projectile vomits after eating 1/2 of a 3oz. can of their fish, especially cod, sole and shrimp.  I'm thinking something may not be right with it... but my other kitty is fine.  I know it's on the cheap end of cat food.  I usually get chicken and beef, ground only.  This sits well in their bellies.  I'm thinking of trying the Merrick brand.  Any recomendations?

     My cat has eaten Fancy Feast Salmon in the past and never had a problem with it.  The only reason I do not fed it now is that she has never been a big fan of fish flavor foods of any kind.  I used it and the Salmon and Shrimp to add some variety, but decided to just stick with the Fancy Feast Gourmet Chicken, Tender Liver and Chicken, and Turkey & Giblet flavors, which seem to be her favorites.  Perhaps your one kitty just has a sensitive tummy to something in that flavor.  Good luck finding something that works for both of them!