Sorry you can't catch any white perch down here. All we have is sac-au-lait. lol
Welcome to south La. You don't state which part of south La. While there are a few places to put out brush most of the structure fished is the banks and laydowns along them. Most bayous and canals are around 6 to 7 feet or less in most cases. Coming out from the banks where the water can be from 1 to 3 feet the canal then drop down to 6 or 7. That drop off is a good place to find them in summer or up on the flats during the spawn. Some times you can find them just roaming in the middle of the canals. Now if you're talking about fishing the Basin that is a little different but not much, mostly shallow bayous and canals with a few deeper places.
PPG