This collection provides an introduction to the macroscopic anatomy of the rainbow trout, along with a detailed description of the histology of the individual organs and organ systems of this widely distributed aquaculture fish in Europe. Each organ system is preceded by a general introductory text, and the individual illustrations are further explained. Particularly in light of the constantly increasing number of fish diseases, the documentation of the histology of healthy trout serves as a valuable reference work. The loose-leaf format allows for convenient use at the workplace.