I used to feed baby LMB and BG/RES in an aquarium . One item I would use was tiny craws about the size of a green pea. The fish loved them. I rotated fish in and out as they got bigger. A few months later I noticed that some new small fish had cuts on them and the fish number was down from stocking. I looked real close and under some stacked rocks was a 3 inch craw snacking on a dead BG. One of the tiny craws obviously survived and hid in the rocks. One days prey becomes the next weeks predator.