Small scale trout farming is a realistic income generating alternative in the mountainous regions of Central and Eastern Europe, the Caucasus and Central Asia where income sources and employment opportunities are scarce or even missing. Though all female eyed eggs of well performing pedigree trout strains can be purchased from many different locations of the world propagation of locally maintained trout can still be technically and economically feasible. Increased official opposing of introducing fish strains with genotypes new in a region is also an additional reason why practical knowledge of artificial reproduction of rainbow trout may be very useful. It is expected that technical information presented in this book will help in the reproduction of other trout species. It may also successfully complement recently produced FAO publications such as Small scale rainbow trout farming, Small scale trout processing methods and Trout farming based angling tourism.