The study looked at what big fish like cod and haddock eat in the Celtic Sea. They found that each fish has its own special way of finding food to avoid competing with each other. Cod and haddock like to eat things on the ocean floor, but cod prefers fish while haddock prefers invertebrates. Hake prefers to eat things in the open water, while whiting eats from both the ocean floor and open water. As these fish grow, they may change what they eat. The type of food available in different parts of the sea also affects what they eat.