Book excerpt: Handbook of Fish Diseases is by any yardstick the finest, most useful book about fish diseases ever offered to aquarium hobbyists. It is so valuably instructive, in fact, that it will be just as useful to owners of pet shops and tropical fish specialty stores and will raise the quality of aquarium fishes all over the world. Colorful, comprehensive and completely understandable, the book is loaded with needed information and good advice that will save money and fishes' lives wherever it's put to use.