The study of process engineering is an attempt to combine all forms of physical processing into a small number of basic operations, which are called unit operations. Almost all the food, feed, fibre and fuel commodities go through a number of postharvest processing operations such as cleaning, grading, separation, heat transfer, drying, storage, size reduction, food engineering operations, packaging, transport and marketing before reaching to the consumers. Understanding the engineering properties of food materials and their initial quality for the production of high quality processed foods is of paramount importance in food processing. Aquacultural Engineering is the latest topic included in the ASRB NET syllabus, which is having significant contribution in all the competitive examinations is provided within this book. The present book is written to satisfy the various subjects syllabus which needs in National Eligibility Test, M.Tech. & Ph.D. entrance examinations in a systematic manner.