Firstly build yourself an economical dock that will make raising of fish in any type of cage much easier. There needs to be a minimum of 1ft of water depth below the cage for adequate water circulation for better health of the fish.
I have used Playstar's commercial grade and standard pipe sleeves that worked well to support the frame of 3 ft - 4 ft wide. Used chain link posts for the upright pipes pounded into the bottom.
https://www.homedepot.com/b/Search/N-5yc...lmax&NCNI-5Get yourself a dock and I can provide more info for trapping and raising YP in cages tethered to the dock. Others here also have good experience growing fish in cages.
