Aquaculture - culture of aquatic organisms including aquatic vegetations under controlled conditions which are now recognized as a viable and profitable farming or enterprise worldwide. As aquaculture technology has evolved, the push toward higher yields and faster growth has involved the enhancement or replacement of natural foods with prepared diets. In many aquaculture operations today, feed accounts for more than a half of the variable operating cost. Therefore, knowledge of fish nutrition and practical feeding of fish is essential for successful aquaculture. This teaching manual aims for a better understanding of fish nutrition and feed technology. There are six major areas of interest in which 25 chapters are included. This teaching manual is a guide for anyone interested in fish nutrition and feed technology areas and student communities in particular.