PERFORMANCE OF SILVER CARP 0-1YPOPHTHALMICHTHYS MOLITRIX) AS AFFECTED BY LEVEL OF DUCK MANURE AND STOCKING DENSITY

HAFEZ, FATMA A.; EL-HELALY, EHAB A.; ABDEL-HAKIM, NABEL F.; MAHMOUD, AHMED A.

doi:10.21608/ejar.1998.365552

PERFORMANCE OF SILVER CARP 0-1YPOPHTHALMICHTHYS MOLITRIX) AS AFFECTED BY LEVEL OF DUCK MANURE AND STOCKING DENSITY

Document Type : Original Article

Authors

¹ Central Laboratory for Aquaculture, Agricultural Research Centre, Giza, Egypt

² Faculty of Agriculture, Al-Azhar University, Cairo, Egypt

10.21608/ejar.1998.365552

Abstract

This study was carried out to investigatigate the effect of duck manure level and stocking density on growth performance of silver carp. The experiment was conducted at the Central Laboratory for Aquaculture, Abbassa, Abou-Hammad, Sharkia, Agricultural Research Center. Six rectangle earthen ponds each of total area of total area of 0.25 Feddan (50x20 m) representing six treatments (3 levels of duck manure 150, 300, 450 kg/fed within each two stocking density 3200 and 4800/fed within each two stocking density 3200 and 4800/fed). The experimental period expanded 20 weeks. The statistical evaluation of results showed the differences in body weight and length at the successive growth were significantly (P<0.05) for the favour of higher manuring level (450 kg/Fed). Regardless of level of manuring, averages body weight of silver carp decreased significantly (P<0.05) with increasing stocking denstiy from 3200 fish/fed to 4800 fish/fed during all experimental period. Relative growth rate increased with decreasing stocking density and improved with increasing the rate of manure.Level of manure and stocking density had no influeuce on condition factor. Total yield increased in a linear manner with each increase in manuring level and stocking density.