On the DI image, it does look like there may be more than one size fish....and from the shape of the bait ball, it looks like the bait could be under attack.....It could be a mix of bait and crappie.
Some absolutely swear by the fish ID on the Humminbirds.....One of them is Wayne P, and not many know more about using their units than he does.
I don't use it much, but am going to start using it more.