F3 PRIMARY PRODUCTION RATE

Biological production in four main natural regions [kg ha-1 yr-1]
                  South Basin Open water  Archipelago North Basin Open water Archipelago
Phytoplankton
(Gr         18,000
    Copepoda                159               438              792
    Mollusca                77                30               353               136

Source: Carmouze, J.-P., Durand, J.-R., & Leveque C. (1983) The lacustrine ecosystem during the "Normal Chad" period and the drying phase. "Lake Chad" (ed. Carmouze, J.-P., Durand, J.-R. & Leveque, C.), pp. 527-560.