Scott, I often forget about the very warm water temps you get down there. They simply are not seen up here in MI. Have heard that when the water gets into the 90'sF they just sit and gasp and do not even spend the energy they need to eat. Still, I wish I had the warmth for growth and I do miss having the ability to see my fish for 3 to 5 months of the year. You are right about the cold water holding more O2. I use that fact in winter and stack about twice as many fish into insulated covered ponds for protection. I have two ponds built just so they can be covered for winter.