TY - JOUR
T1 - The production of the freshwater prawn Macrobrachium rosenbergii in Israel. III. Density effect of all-male Tilapia hybrids on prawn yeld characters in polyculture
AU - Cohen, Dan
AU - Ra'anan, Ziva
PY - 1983
Y1 - 1983
N2 - The effect of two densities of all male Tilapia hybrids and two procedures for feeding and manuring on Macrobrachium rosenbergii yields and population structure were examined in 22 ponds of 400 m2 each. Prawns stocked at 5,000, 10,000 and 15,000 per hectare demonstrated a biomass increase of 586, 1,033 and 1,430 kg ha-1 respectively, during a growout period of 89 days. The average weight was inversely related to prawn stocking density and reached 35.0, 31.0 and 26.1 g respectively. Both the total prawn yields and the average weights were independent of Tilapia stocking rates and of the feeding-manuring strategy. Prawn yields and average weights were affected by the density of the prawn population alone. Survival rates in all cases were above 85% and did not correlate with either prawn or Tilapia stocking rates, nor with feeding strategy. M. rosenbergii population analysis was performed with respect to size distribution and morphotypic variation and characterization. These parameters were found to be affected solely by prawn density and were independent of the number of Tilapia stocked and the feeding strategies tested. Contrary to prawn performance, the growth of Tilapia was strongly affected by its stocking density and by the feeding-manuring strategy. The combined yields of Tilapia and common carp varied between 8,400 and 12,000 kg ha-1 year-1, for the different prawn densities.
AB - The effect of two densities of all male Tilapia hybrids and two procedures for feeding and manuring on Macrobrachium rosenbergii yields and population structure were examined in 22 ponds of 400 m2 each. Prawns stocked at 5,000, 10,000 and 15,000 per hectare demonstrated a biomass increase of 586, 1,033 and 1,430 kg ha-1 respectively, during a growout period of 89 days. The average weight was inversely related to prawn stocking density and reached 35.0, 31.0 and 26.1 g respectively. Both the total prawn yields and the average weights were independent of Tilapia stocking rates and of the feeding-manuring strategy. Prawn yields and average weights were affected by the density of the prawn population alone. Survival rates in all cases were above 85% and did not correlate with either prawn or Tilapia stocking rates, nor with feeding strategy. M. rosenbergii population analysis was performed with respect to size distribution and morphotypic variation and characterization. These parameters were found to be affected solely by prawn density and were independent of the number of Tilapia stocked and the feeding strategies tested. Contrary to prawn performance, the growth of Tilapia was strongly affected by its stocking density and by the feeding-manuring strategy. The combined yields of Tilapia and common carp varied between 8,400 and 12,000 kg ha-1 year-1, for the different prawn densities.
UR - http://www.scopus.com/inward/record.url?scp=0003091801&partnerID=8YFLogxK
U2 - 10.1016/0044-8486(83)90070-4
DO - 10.1016/0044-8486(83)90070-4
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AN - SCOPUS:0003091801
SN - 0044-8486
VL - 35
SP - 57
EP - 71
JO - Aquaculture
JF - Aquaculture
IS - C
ER -