Fish and fisheries play critical roles in ocean health, community well-being, food security, and economic stability. This book provides a comprehensive overview of fisheries. It includes seven chapters that address such topics as crustacean taxonomy, crustaceans and water quality of the coastal areas of Nigeria, characteristics of freshwater and brackish water fish in the Mekong Delta river system, feeding diversity of finfish, and much more. This volume provides future directions for improvement and advancement in fisheries research.