This book contains 27 chapters on finfish aquaculture. The chapters were designated into four main topics: I. Aquaculture diversification an introduction (contains the first seven chapters namely: fish culture: achievements and challenges, fish culture: the rearing environment, fish culture: feeds and feeding, farmed species and their characteristics, considerations for the selection and commercialization of new or alternate species, a systematic market approach to species diversification: a French case, and the agribusiness approach), II. Finfish species description and biotechnical analysis (contains chapters 8 to 21 namely: quantitative approaches for identifying finfish species suited for sustainable and productive aquaculture, the sturgeons (Family: Acipenseridae), milkfish (Family: Chanidae), the catfish (Family: Ictaluridae), the salmonids (Family: Salmonidae), the codfishes (Family: Gadidae), the snooks (Family: Centropomidae), the temperate basses (Family: Moronidae), seabreams and porgies (Family: Sparidae), tilapia (Family: Cichlidae), drum-fish or croakers (Family: Sciaenidae), the wolffishes (Family: Anarhichadidae), the tunas (Family: Scombridae), the flatfishes (Order: Pleuronectiformes), respectively), III. Market and Economic Analysis (contains chapter 22 (marketing new species) and 23 (diversification pays: economic perspective on investments in diversified aquaculture)), and IV. Future perspectives (contains chapter 24 to 27 namely: offshore and recirculation technologies, valorization of aquaculture by-products, organic and ecolabelling, and the future of aquaculture: insights from economic theory). This book also contains an appendix and index.