At almost 1000 pages this is a serious book for the serious fish-keeper. Sections on tank maintenance and equipment, water chemistry, plant care, fish anatomy, feeding, diseases and others, ensure that all the major areas of the hobby are covered in some depth.
The highlight of this book is the section with 600 colour photographs of fish. Accompanying each photograph is valuable information including sexual differences, social behaviour, breeding information and environmental needs. The quality of the photographs is first rate and at two to a page they are large enough to see even small details clearly.
Almost all of the more commonly available fish are listed with the less well known fish reserved for later volumes. Killifish appear to be overly represented with 64 species, more than some killifish books, while with more rainbow fish in the hobby these days, their section could perhaps be expanded.
The book is well indexed with common names, scientific names and synonyms each having their own listing.
Any reference book of this scope is unlikely to be error free and the photograph claimed to be of Crossocheilus siamensis is probably one of the Epalzeorhynchus species. I occasionally disagreed with some of the species information, Gymnocorymbus ternetzi for instance, is listed as peaceful and suitable for any community tank. This is at odds with my experience of these fish as aggressive fin nippers. The technology and accessories section also needs updating.
These are minor points however, and do not detract from the overall value of this book. If you can only have one book on fish-keeping, buy this one.