Black marabou leach and ryacophila emergers for freshly stocked trout. If that does not work then start changing flies like crazy. A lot of stockers are going thrugh a period of "Culture Shock" after being released. The only predictable thing about them is the fact theat their behavior is totaly unpredictable. And yes - the longer they remain in any water the more cautious they get. Like their natural instincs are slowly waking up...