On my 797 they show up as white patches.Some of them are what i consider to be be panfish looking.I have been in a school of Gar,and some other bigger fish and I can tell there's a contrast in size and shape.Much like arches on a traditional 2D model.I been fishing in shallow tight coves and creeks,and have had my SI cut down to 25' on each side and my max dept down to 10'.It opens the scrren up,so to speak.I'm sure the guys with the 1197s/98s can see pretty much anything in the water.