MATERIALS AND METHOD
Fish farms used in this study were ponds being used for commercial purposes, and which retained water throughout
the year. They were drainable and had well conditioned dykes and each was fertilized with only one type of fertilizer.
They included cow manure-fertilized pond, poultry manurefertilized pond, pig manure-fertilized pond, and, blood manure-
fertilized pond. Each pond was stocked with tilapia. Fish from River Volta, a non-fertilized pond was used as
control. Cast net was used to collect fish samples from the various ponds. Five live tilapias were randomly selected from
the catch at each sampling time.