The Biology and Culture of Tilapias

Table 7. Semi-intensive cage culture of tilapias using aquatic and terrestrial plants. Bracketed values are representative within the size ranges of fish used.

Stocking data Growth data Harvesting data Culture
Species and sexes Supplemental Pmi Bi G MSG DRIB Pmf Bf MP period
used: country feed (g) N/m3 (kgm3) ($Id) (%) (1) (g) (kglm3) (kglrna) FCR (mo) References and remarks

T. guineensis, Fresh algae 42 86 3.6 0.4 26 0.82 53 4.6 0.97 46 1 Philippart et al. 1979:
males: Belgium (26% protein). dry 4.5 cages, 0.5 m3; average
DFR 4.8% B temperature ~5.8~~

S. niloticus Hydrilla 170 501 0.8to 0.44 170to 1.1 to (0.5) 23 3 Rifai 1979. 1980: cages,
mixed sex: verticillata (96 15or 6.6 0.43 - - 21 8 7.6 - 19 1 m3 with 3 mm mesh
Indonesia Cham sp. 276) 45 0.73 (1.5) 33
Lemna minor
all at or above
DFR 30% B

T. rendalli,
mixed sex:
Colombia

Pmi :
N:
Bi :
G:
MSG :
DRIB :
Pmf :
Bf :
MP :
FCR :
DFR :
B:

Alocagia 22.5 100 2.25 0.95 127 1.31 165 15.8 2.7 - 5 McLarney 1978;

macrorhiza cages. 1 m3;

leaves, ad lib. survival, 96%

a. Alocasia

macrorhiza

leaves. DFR

10% to 20% B

b. Alocasia

macrorh izo

leaves. DFR

10to 20%B

10 50 0.5 0.55 164 1.16 128 6.0 0.79 7.2 Popma 1978; cages, 1 m3;

10 100 1.0 0.46 136 1.09 108 10.5 1.33 10 to 13 survival, 96.4%;

10 200 2.0 0.34 100 0.97 82 16.0 1.98 a) complete trial with

small fishes; b) same fish

from week 19 to week 31

48 50 2.4 0.97 54 0.95 128 6.0 1.40 3+

42 100 4.2 0.81 51 0.95 108 10.5 2.33 less than 10

33 200 6.6 0.59 48 0.92 82 16.0 3.48

Alocasia 27.4 175 4.8 0.41 45 0.83 76.4 13.0 2.0 4 Corredor 1978: 4 cages,

macrorhira 26.6 225 6.0 0.50 56 0.96 86.4 18.8 3.2 1 m3; complete trial over

leaves, ad lib 6 mo but difficulties after

4 mo

mean weight at stocking

number of fish

mean biomass at stocking

average growth rate of individual fish during the culture period

average monthly specific growth rate

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

mean weight at harvest 100

mean biomass at harvest ,

average monthly production: (Bf - Bi) observed and recalculated on a 30-day basis

feed conversion ratio. on a net weight basis unless otherwise indicated

daily feedii rate as % B (biomass)

biomass