AQUARIUM enthusiasts and pondkeepers have for many years felt the need for a book dealing with fish diseases and their treatment. However, although books covering practically all other aspects of fishkeeping have been produced, until now no volume in the English language dealing solely and comprehensively with diseases has been available. It could be thought that this lack of literature might be due to lack of scientific knowledge on the subject, but this is not really so. A disadvantage for British aquarists was that most contributions had appeared in Continental publications, including large reference volumes, whilst articles in English were scattered over a number of amateur and professional magazines, which made it difficult to find the required information at the moment it was needed.