Synopsis This book, one in the series of books on animal groups, comentrates its focus upon fishes and their endocrine system. Centering focus upon all classes and major species of fish, the book delineates the importance of the endocrine system in fishes, particularly as it controls chemical coordination in fishes, especially through the functioning of hormones. The processes of circulation, respiration, air breathing, body temperature water balance, swimming and reproduction, all of which are central to the way fishes live all are under the influence of hormones and the book makes full efforts to highlight the role each hormone plays. In addition, the book also, includes illustrative diagrams, enhancing the book's information through the visual mode. The book's erudition and incisiveness serve well for the readers.