I have followed this thread with some interest as here in Australia we have many introduced cichlids which are slowly spreading through our warmer streams and impoundments. Most notable O. mossambicus which has formed large populations in nearly all warm impoundments over the last thirty years. These fish used to suffer massive winterkills but have adapted and now this is rarely seen. They have had a huge impact on many of our native fish, though our large predatory fish feed on them. I have followed the introduction of Peacock bass since the mid eighties as a great deal has been written on the subject since the initialproposal. The introduction of Peacock bass into South Florida in 1984 has been without doubt one of the few non native introductions which has worked as they are contained in the enviroment they have been introduced into and control introduced cichlids to the benefit of native species providing a fantastic fishery. I hope they recover and any of the native species affected as well. As an aside Florida is often quoted here in Australia by biologists as a worst case scenario for introduced species as you have so many, not just fish all types of animals.
Steve.