This is certainly interesting. For many years we owned an ocean front home on the NC/SC border, on Oak Island.
I mainly surf fished with 4-6 inch mullet that I could easily catch with a cast net by walking the shoreline. One throw would usually give me well more than a day's worth of bait for blues, stripers, flounder, red drum, sea trout, and small shark.
From June through August, I would guess that I could easily have netted hundreds of pounds of them, had I decided to do so.
I never knew they could exist in fresh water. If they really can, they would probably make fantastic forage for bass. The ones easily caught near shore have the right form and size. They move close to shore in schools of the thousands. They are very easy to catch with a cast net.