I have used perch as bait. You can catch them with a rod and reel or a net. If you seine a small creak you will likely end up with plenty of bait. I always test the depth with some line and a weight, I also make it where there is a little leeway as my bait is live and I want it to be able to move some. Depending on your state limb lines are also a good way to fish.
If you don't have your line secure there is a good chance that a hooked fish will later become entangled with the trailing line. That is why it is a good idea to test the waters depth etc. before setting up, and always have everything secure.
