This discipline of behavioural ecology has reached a turning point- empirical evidence in behavioural ecology has led to the reformulation of the classic explanatory theories, and new areas of interest have opened up. The study of fish provides an excellent model of the subject, allowing a concise but complete treatment of the field. This book is based on papers from the proceedings of a conference held at the Ettore Majorana Centre, Erice, Italy, provides an overview of the key developments in behavioural ecology. Four main areas of interest are covered the behavioural ecology of predator avoidance, foraging, resource defence and life histories and reproduction.