Lots of bait fishermen went through the oxygen injection deal. It does work as far as keeping the dissolved levels up and for some things it is essential. It also requires extra space and can be quite dangerous. But in the end, to keep regular bait alive, which are way more delicate that bass, a simple bubbler (just like in aquariums) will do the job. Cool the water some, add a little salt to help hold oxygen and calm the fish and run it full time (as they do not draw much at all) while you have fish in the well. The systems for boats are cheap, easy to install, and easy to maintain. It keeps oxygen levels up and the bubbles help remove harmful carbondioxide. Oxygen systems do not and it doesn't have to be that complicated.