Effect of Fertilization on Production of Nile Tilapia in Earthen Ponds II) Effect of an untraditional organic fertilizer and stocking density on the fish yield of Mixed-sex Nile tilapia ( Oreochromis niloticus)

Abstract

ABSTRACT The experiment was designed to determine the optimal fertilizing rate of Abis organic fertilizer and to investigate the effect of stocking density on mixed-sex Nile tilapia performance. . Fish in this experiment were fed to apparent satiation level in 20 min. This experiment lasted for 112 days. Water quality parameters were monitored weekly in each experiment. Growth rate, specific growth rate, gross yield did not significantly differ among treatments, due to variation between replicates within treatments. Gross yield showed a positive trend with both the fertilizing rate and stocking density. The effect of the treatments on water quality parameters was discussed