This paper describes the evolution of cage farming in Ireland, especially the development of an offshore fish farming sector where some 50 per cent of the 14,500 t of salmon (in 1997) are produced. Aspects of cage evolution are discussed, from early wooden cages and the progression to steel, the progression from steel to plastic and then to offshore cages such as Bridgestone and Farmocean. The paper attempts to describe how the industry had to take the technology and modify it to suit the environmental needs of offshore Ireland, pointing out what was successful and what failed. Finally the future needs and potential for progress for offshore cage farming in Ireland are addressed.