Chronology of the implementation and dissemination of the three innovations in the regions studied (the stars represent their emergence: 1: production of large tilapia, 2: tilapia, Hemichromis fasciatus and Heterotis niloticus polyculture, and 3: flooded rice cultivation). The outer columns on the far left and far right show the main activities of fish-farming development in the regions studied in Côte d’Ivoire and Guinea. The main technical developments are described in the central columns. The arrows illustrate the path of their dissemination. The grey boxes present the current fish farmers.