Just after feeding

Just after feeding, the fish seem to keep eye contact with me for a little while while resting there, digesting their catch. I think the larger fish can eat a whole sausage each and maybe two. When the fish, who make off with a whole sausage, come back , they are still just as hungry for more. I wonder if they like the smooth sweet taste of the sausage? I have tried feeding them white bread and bagels, but they don't like these. I even tried to feed them coissants but they don't like that either. Not even whole grain wheat bread or even Artificial crab stick. They do not like Crab Stick at all , none of them do. Surprising.