I know this isn't the best picture. I didn't have this realization until editing my tournament footage. On this spot I caught maybe 30 bass in about 2 hours. Do you notice how tight that ball of bait is? Just a complete circle. Those bait are scared! That's how bait protects against predators.  You can see the same thing if you use a 2d sonar unit. There's still a lot for me to learn about this but it's very obvious that bait behaves differently depending on how many fish are around.  I never thought of this before.