Years back I had a BIL that worked in sales for a Welding supply firm out of LC. He had bought a large fine pore aquarium air stone and had a little pony tank of O2 and a low pressure/low flow regulator. We had picked up about 2 quarts of live shrimp at Hackberry and put them in a small styrofoam 'disposable type convenience store cooler' less than 1/2 full of water. He put the stone in the bottom set on a very low flow rate. We then launched by the C ferry and fished the Johnson Bayou rigs until about noon, worked grass beds for t-tail, and then the buoy chain for ling. I don't think we lost more than a half dozen shrimp all day. I was amazed. My current rig built in to the boat will keep 3-4 inch poagie and shrimp alive with less than 15% or so loss over a half day in the middle of summer and better in cooler months. Although the O2 rig works amazingly well my stock live wells work good enough to not have to use supplemental oxygen. If one has a live well has a higher bait mortality rate It would definitely solve the issue.
BTW...my BIL also stated that he could keep shrimp alive for a couple of days in a little cooler like that with that O2 rig; he was not one to stretch the truth so I believe him.
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