The Roach get bullied out by the bigger fish
Some anglers say that the bigger fish will bully out the smaller fish to dominate baited area.
This is certainly true, as can be seen in this video. Its not that the bigger fish are aggresive, but there presence is enough to scare the smaller fish away.
However, as you can see. No sooner have the big fish left, then the little uns are back feeding.
What did you see?