[latravcha]

During the heat of the summer you can add ice. The cooler the water the more oxygen it can hold. Make blocks from rain water. I try not to use ice made for tap water. You can also freeze water bottles and throw one in every now and then. When it is really hot you want to circulate your water every 30 minutes.
Another option is putting an additive in the live well. I would use products similar to these when I fished bass tournaments.
http://www.thmarine.com/products/New...U2-Pro-Formula