One is that it's instinctual. They are utilized to getting hold of available food and also even though their wish of food is suppressed throughout their quest up stream they will certainly now and then connect as well as grab some. So the much more you give them the possibility to consume the far better your chances are.
I always take the hatchery fish out of the system to prevent having them reproduced with native fish and consequently pass on inferior genes. Every hatchery fish I've caught as well as dressed has actually not had anything in its tummy. From morbid interest I inspect. I understand gross huh.