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9. ECONOMICS OF RIZI-PISCICULTURE

There is very little published information on the economics of rizipisciculture. Vincke (1979) cites the data of Tan et al (1973) on rizi-pisciculture farms in Malaysia.

The following is the summary of Tan's observations.

 Farmers' own FarmsFarms on Rental
 Double harvestSingle harvestDouble harvestSingle harvest
Revenue (annual) per farm (U.S. Dollars) (Average size of farm: 1.1 ha)762 $366 $393 $184 $
Percentage of annual revenue from fish6%27%12%52%

Average production of paddy in these forms was 2270 – 2966 kg/ha/year and fish production 132 kg/ha/year. The major species cultured were Trichogaster pectoralis (72%), Clarias macrocephalus (20%), Ophiocephalus (Channa) striatus, (6%) and Anabas testudineus (20%).

Table VIII

Fish production in rice fields
(from Vincke, 1979)

 Continent/ CountryMethods of rizi-piscicultureProduction
ASIA   
Indo-PacificRizipisciculture extensive100–200 kg/an
Rizip. intensive experimental17.5–152.5 kg/71 days
Rizip. intensive experimentalTilapia 100 Kg/3
China (Province of Taiwan)(Tilapia mossambica prawnscrevettes 200 kg/3
 Rizip. intensive (T. mossambica)220 kg/an
IndonesiaRizip. extensive (common carp)150 kg/4 mois
Idem (T. mossambica)75–100 kg 3–4 months
Rizip. intensive30–50 kg/40–60 days
Rizip. extensive3 kg/6 mois
JapanRizip. intensive (common carp production)100–200 kg/an
feed fingerlings 2 years700–1000 kg/an
Malaysiaidem carp 3 years harvest1,100–1,800 kg/an to 2,250 kg/an
Rizip. extensive (Trichogaster  pectoralis135 kg/6–10 months
Rizip. intensive10–400 kg/6 months
Rizip. intensive (T. pectoralis)132 kg/ha
ThailandRizip. intensive (T. nilotica and carp)210 kg/ha
idem + feeding250 kg/ha
idem + feeding + fertilization418 kg/ha
VietnamRizip. intensive (common carp)80–100 kg/3 months
 idem100–150 kg/6–7 months
AFRICA Rizip. extensive10–20 kg/2 months
Cote d'Ivoire
Rizip. intensive monoculture Heterotis niloticus139 kg/ha/an-120 days
idem monoculture (T. nilotica)44,5 kg/ha/an-120 days
idem monoculture (T. macrochir)37,7 kg/ha/an-120 days
Gabon
Rizip. intensive polyculture (T. nilotica - H. niloticus)680 kg/an-6 months
LiberiaRizip. intensive (T. macrochir)234–283 kg/ha/an
MadagascarRizip. intensive (carp common)200–250 kg/ha/an
idem (carp + carasaius)200 kg/an
idem (carp + commune)150–200 kg/130 days
Rhodesiaidem (T. mossambica)max. 70 kg/4 months
Tanzaniaidem (T. nilotica)110 kg/an
Zaireidem polyculture Tilapia + Haplochromis mellandi100 kg/an
USA Rizip. intensive (Icralurus + rendalli)166–562 kg/an
BRAZIL Rizip. intensive (carpe + T. rendalli) 100 kg/an
ITALY Carassius 

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