The spectacular growth of the aquaculture industry during recent years has depended to a significant extent on the use of alien (introduced) species in many of the countries where the industry is a key revenue earner. The use of introduced aquatic species can bring with it many problems, both real and perceived. This timely book looks in detail at this extremely important area, providing a critical and objective evaluation of the role of alien species in this ever growing food production sector. Coverage includes detailed reviews of the definitions and invasiveness of alien species, the history of introductions and translocations, and the contribution and also negative impacts made by alien species. The book also contains several case studies covering major introduced species and a review of current international protocols pertaining to these issues. All major types of cultured species are encompassed by the book, including crustaceans, molluscs and finfish.