My experience in TN is that they eventually disperse. The longer they are in the river, the more they start acting like natural born wild trout. However in TN many of them are harvested so we see the same stocked cycle (and behavior) over and over. Occasionally you catch a RB that has been there for a while, gained real river colors and some weight. I have had good luck with a homemade Woolly Bugger which uses Sulky Holoshimmer (from Joanns) excusively in the tail on these stockers in TN.