The lsraeli Joumal of Aquaculture - Bamidgeh 50(1), 1998, 33-42

CULTURE OF MACROBRACHIUM ROSENBERGII
IN MONOCULTURE AND POLYCULTURE
WITH OREOCHROMIS NILOTICUS IN PADDIES IN EGYPT


Sherif Sadek  email: sadek_egypt@hotmail.com

Arab Aquaculture Consultants Office, 6 Dr. Mahmoud Azmy Street, 11211 Zamalek, Cairo, Egypt

Jacques Moreau

Department of Inland Fisheries, INP, ENSAT, 145 Avenue de Muret, F-31076 Toulouse Cedex, France

(Received 12.4.97, Accepted 9.3.98)

Abstract

Production of Macrobrachium rosenbergii and Oreochromis nitoticus in 7,200 m² paddies was evaluated. The stocking density of the prawn monoculture was10,000 and 20,000 prawn juveniles per hectare. In the polyculture system, 10,000 prawn juveniles and 5,000 Nile tilapia fingerlings per hectare were stocked. Rice paddies with no prawn or fish were used as controls in a replicate experiment. The mean prawn yields after 90 days of culture using the monoculture system were 429.0 and 844.6 kg/ha for the low and the high stocking densities, respectively. In the polyculture system, the mean yield was 254.0 kg prawns plus 754.4 kg Nile tilapia per hectare. The mean prawn harvest weight was 48.4-45.9 g in the monoculture system and 30.3 gin the polyculture. The mean harvest weight of the Nile tilapia was 160.5 g. The mean rice crop was 8,805 and 8,722 kg/ha in the monoculture, 8,605 kg/ha in the polyculture and 7,378 kg/ha in the control fields. Total production costs per hectare were estimated to be US$ 2,432 and 3,318 in the rice-prawn fields, US$ 2,797 in rice-prawn-fish fields and US$ 1,161 in the control. The maximum net return per hectare was US$ 4,507, obtained in high density rice-prawn culture, while the rice only treatment gave the lowest net return, US$ 904 per hectare.

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