FirstMate Pacific Ocean Fish Meal with Blueberries formula is ideal for cats and kittens of all-life-stages. Wild caught herring, anchovies and sardines are the primary source of protein. The full fish is used rather than heads and frames. FirstMate Pacific Ocean Fish Meal with Blueberries is a low carb, grain & gluten free formula that is rich in antioxidants and low in ash & magnesium