Here's a few screenshots from my HDS5 of sambos.

Sensitivity 75-85%

Default Colour pallet

200khz

The shallow ones are from Five Fathom Bank and the 40s is south of Rotto. Sambos are the easiest species to distinguish on my sounder, very solid return and characteristically the fish "stack up" on top of each other sometimes up to 20m off the bottom. Ive added a video (not mine) as what I interpret my sounder to be reading with the fish stacked up on top of each other, and a fair way off the bottom.