From the author of Naturalized Birds, Naturalized Mammals and Naturalized Animals, this new work describes where, when, how and by whom the alien inland fishes now living in a wild state throughout the world were introduced. It also addresses how they subsequently became naturalized and what, if any, effects they have had in their new environment. The book is a story of mixed blessings - of introductions which have provided a much needed food source to those that have led to the decimation of native fish populations.