The white marks/dots on the right of the screen "could" be fish. At that depth and speed, I don't know whether or not fish would show up any other way.
Some images I've taken with my Lowrance Elite 5DSI show fish mostly as white "dots" of varying size. I only have one screenshot that shows images that are obviously fish .... this one :
Attachment 275968
Others that I've taken show the cover in great detail, but not so much the fish ... like this one :
Attachment 275969
You will notice that my speed & the depth of water are much less than yours.
I've missed the opportunity to capture some really good screenshots showing suspended fish (loose grouping of white dots) and a group of fish at the edge of a huge ball of Shad (10' high x 20' long) ... but, I was actively engaged in pushing jigs & cranks at the time, and was more focused on trying to catch the fish than capture the screenshots.