The world-wide increasing demand for seaweeds and seaweed products as items of food and raw material for the manufacture of industrial products as agar, carraheenan, and alginate has been the main factor which has encouraged the development of production technologies of economic species of seaweeds. This paper is a brief review of the current production technologies for four tropical seaweed genera, namely. Eucheuma, Kappaphycus, Gracilaria and Caulerpa. The related production problems and needs are also described.