Bangladesh is a riverine country. A large number of rivers are present here. Among these, Karatoya river is the most ancient and plays a vital role in the development of livelihood status of local fishermen. At present, because of increasing the use of different types of destructive fishing gear, fish diversity decreases gradually as a result of over-exploitation. For this, study on fishing gear and diversity of fishes of this river is very important and according to the spirit of the age. This book provides some general information?s on fishing gear and their operating system, diversity of fishes and their present status, and socio-economic status of the adjacent fishermen. This book would be beneficial for fishermen, researchers, government and non-government organizations, and other peoples related to this subject.