Survival rate was higher in ponds fertilized with effluent and in ponds with lower fish density. There
were no differences for gain in weight and length due to treatment, and no interaction between fertilizer
and stocking density. However, these data were derived from random samples of fish taken at 20 day
intervals and the results were partially confounded by differences among treatments in survival. Net
fish yield was higher for the higher stocking density but there was no effect of fertilization with
effluent. Feed conversion (DM offered/net fish yield) did not differ among treatments but this
measurement was also confounded by differences in survival as amounts of feed offered were based on
initial numbers of fish and the average weight estimated from the sampling at 20 day intervals. Final
fish weight and net fish yield were negatively correlated with survival rate.