Table 17. Comparison of the production performances of Sarotherodon aureus, S. niloticus, S. mossambicus and Tilapia rendalli in three cage culture systems:
extensive, semi-intensive and intensive. Bracketed entries are representative of the values reported. Data obtained from all authors cited in Table 16.
Extensive culture Semi-intensive culture Intensive culture
G MSG MP DRIB G MSG MP DRIB G MSG MP DRIB
glday (%I (kg/m3) (%I (%Id) (%I (kglm3) (%I glday 6) (kglm3) (%IA. Initial stocking with small-size fingerlings (10 to 15 g)S. aureus 0.78 235 12.7 2.5 - - - - 0.5 to 1.4^156 to^408 7.8 to 20.6 2.2 to 3.0
S. niloticus - - - - 0.8 - 2.3 - 1.05 197 7.6 1.5
S. mossambicus 0.36 110 0.8h4 > 1.3 0.5 157 0.8 1.9 0.65 195 1.0 2.2
T. rendalli - - - - 0.34 100 2.0 (1.0) - - - -B. Initial stocking with medium-size fingerlings (20 to 30 g)
S. aureus 0.72 86 14.1 1.7 - - -4- - 1.1 to 1.7^128 to^207 16.0 to 24.4 1.8 to 2.2
S. niloticus 0.60 68 3.5 (1.9) - - - - 0.9 to 2.0 87 to 200 5.8 to 10 1.3 to 2.7
S. mossambicus - - - - - - - - - - - -
T. rendalli - - - - 0.5 to 1.3 56to 173 2,7 to 3.9 1 to 1.5 - - - -G : average growth rate of individual fish during the culture period
MSG : average monthly specific growth rate
MP : average monthly production: (Bf - Bi) observed and recalculated on a 3Oday basis
DRIB : daily rate of increase of the biomass calculated from Bf = Bi (1 + i)" where n is the culture period in days and i is DRIB
100