We often hear the term “bait-ball”, but sometimes anglers are not sure that’s what they are marking. Bait-balls are usually a school of baitfish that are in a “protective” pattern, swimming tight together trying to get away from predators trying to feed on them.
The baitfish-ball in the above Raymarine HybridTouch CHIRP DownVision screen grab definitely shows a “ball” configuration. This means gamefish are nearby and trolling should be done close to the bait-ball.
In this image, the baitfish are dispersed, probably feeding in the water column. This means the predator fish are not nearby and it’s best to troll away from the feeding baitfish.