This project was envisaged with the intention of exploring the bionic mechanisms for locomotion in fish and to analyse and thereby develop a model of fish propulsion. It is a part of the ongoing research of Prof. . V. P. Bapat and is guided by him. The work done so far by other students through previous projects has given a certain direction to the research. A scale model of one fish propulsion type has been previously tested. The project focuses more on the development of an appropriate mechanism for subsequent building and testing of a scale model to verify and evaluate the nature of the movement obtained with reference to the bionic principles involved. It is observed that most bionic research in this area focuses on the development of electrically powered crafts. This project, however, focuses on developing a mechanism for pedal-powered boats for leisure and recreational activities, sports, etc. The approach has been to develop a mechanism that conveys the essence of the action with correct proportioning and becomes an integral part of any boat form developed for it.