No doubt they also eat many other things, but those are the most successful baits.

A straight forward ledger rig with a fairly large hook works well, and the bigger hooks makes it easier to get the hooks out. A small hook is definitely not advised as you will lose most of them.
For reasonable size fish a 2/0 or 3/0 hook can be used quite easily with as much bait on it as you can fit.

Generally found in small "holes" (1 or 2 foot deeper) in river areas, especially around the trees in the flats along the river edges, and where silt has recently been deposited from the rains.

They mainly feed at night when the water is clear, and prefer dark environments or deep or muddy water.
If you look at their eyes they will see that they are large for seeing better in a dark environment, so that is where to find them, where there is not too much light.

If specifically fishing for them, several handfuls of kapenta will generally gather enough for you to have a good meal for a few people. You can "make" a spot for them by continuously putting down kapenta (quite a lot) in the same place over a couple of days, of course in the right kind of area.

Chicken livers and kapenta are the best baits,  then small plaaties or pieces of plaaties. Worms do work, but put on lots of them.

BEWARE!!!
These fish do have very sharp spines with very fine points and although you may think that the spine has all come out after you have been stabbed, you will find that it will sting like crazy for a long time and never seems to heal up. Often that is because the fine tip of the spine has remained behind when you pulled it out.
For the safety of children and yourself cut these spines off and throw them away back into the water.