I stole this from another fishing web site. http://h2ophotopros.com/video/baitball.wmv Even though it's salt water, predators tend to use the same hunting behavior in fresh water. Notice that the Dorado tend to work around the outside of the bait and not go crashing through the middle of the ball. Next time you see a bait boil on the surface toss your Lure or bait just along the outside of it . When you drag a lure through a bait ball the bait fish react to it as if is a predator in their midst and it can scatter the ball reducing the time you have to fish it.