The book is designed for use by anyone who is interested in Toxicology, Histophysiology and environmental impact on the fish. The main chapters in which Histological features are demonstrated using a variety of special techniques which are not normally available through the class room sessions. There fore I feel this book is well equipped to present a balanced view of Histology, which is relevant for aquaculture. Student having short time to assimilate can refer to this book and acquire immense amount of knowledge.