F3 PRIMARY PRODUCTION RATE

                            Year (Source no.)                                 1971 (2)     1972-73 (8)  1974 (8)   1978 (8)
Mean integrated rate of net photosynthesis [g O2 m-3 hr-1]                        -            0.64        0.4       0.34
Mean maximum rate of net photosynthesis at depth of highest production [g      1.1-2.3         12.4        2.6       0.82
Mean daily rate of net photo-synthesis [g O2 m-2 day-1]                   5.4-8.6*1 31-36*2    7.6         1.3         5
Mean respiration rate [g O2 m-3 hr-1]                                             -            3.5        0.98        2.6

*1 Light and dark bottle method. *2 Diurnal free water method.