CJ thanks for the info. I have read part and will reply when I get a second. George has been through this exercise and knows he can grow them well in his very hot water. The Symp. he cites has a ton of good info. However there is always new info to find and that was what I ask for and you provided. Thanks and the study has lots of info on first glance. I have more info and from ponds to add. I need to look more closely but on first glance it does not support (in fact contradicts) the notion that HSB need cooler water and more DO than ponds provide. More later.