We’re all aware that there are some risks of bringing in foreign animals and that no aquatic systems are immune to exotics. In the northwest, introduced trout may be negatively impacting amphibians populations and Atlantic salmon have escaped aquaculture operations possibly threatening Pacific salmon stocks. In south Florida we have the walking catfish and several species of cichlids established with an exotic eel poised to enter the Everglades. And in the southwest and mountainous regions, cichlids, tropical fish, and introduced crayfish threaten the habitat of several rare desert fishes.