My friend Jeff that I fish with debunked a couple of myths for me. He has a Stratos bass boat that has 2 large live wells in the back. Last Friday we had about 50 herring in his live well and most all were still live and frisky 6 hours
later. He said the tank does not have to be round. He said the reason herring bunch up and suffocate is lack of oxygen. He has a high output 12 volt bubble aerator in the well he keeps the herring in and that along with some ice a couple of times in the trip and 90% of the herring left were still lively. Most of the dead ones were ones we put back in the well when we moved to a new spot. I think the bubbler has two tubes out of it, both in the one well.
Mark 1:17 ...I will make you fishers of men