For shiners I just use a minnow bucket, with a bubbler and a styrofoam liner to keep them dark, cool, and happy. They do okay, but I'm not keeping a lot at a time. Never used shad, but one thing I've read about using them is it's important to keep them in a round container, so they can keep moving. If the container has corners they'll get "stuck" and die. Sounds weird but it kinda makes sense.