Many exotic organisms, particularly fishes and plants, have become a part of Florida's aquatic ecosystems. The majority of these organisms was introduced accidentally as a result of activities of professional aquarists, particularly through carelessness by tropical aquarium fish farm operations. One exotic fish species was established from the release of stocks imported for experimental purposes. Amateur aquarists and tourist attractions also have the potential for introducing exotic aquatic organisms. Future introductions can be reduced through better safeguards in respect to prevention of escape and more public education.