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Abstract
The objectives of this study were:
1- The effect of rearing freshwater, M rosenbergii (monoculture) averaging 0.04±
0.001 g and 0.30 ± 0.02g in weight, with different stocking densities (200, 400, 800
and 1200 prawn 1m2 and 50, 100, 150,200 prawn 1m2, respectively).
2- The effect of polyculture between the prawn (average weight 0.30 ± 0.02g) of four
treatments at different stocking densities (50, 100, 150 and 200 prawn 1m2) with Nile
tilapia fry 0. niloticus (average weight 0.35± 0.03g) at stocking density 12 fish 1m2
for each treatment. Using 36 circular fiberglass tanks and 35% protein diet. On
growth performance, survival rate and carcass composition. The physico-chemical
analysis of water were recorded and water exchange occurred daily with 20% of
water size. Different growth measurements were recorded every 15 days intervals
during the experimental period (90 days).
The results of the study showed that freshwater prawn (M rosenbergii)
juveniles (average weight 0.3g) were more suitable for monoculture than the prawn-
postlarvae (average weight 0.04g). While, polycuJture was more suitable at stocking
density of 100 prawn/m’ for optimum growth performance and survival than of
mono culture at the same stocking density. Therefor, 0.3g and 100 prawn per m2 can
be recommended for carrying out freshwater culture under similar experimental
conditions.