INTRODUCTION
Application of fertilizers to ponds substantially increases fish yield but the increase in cost of commercial fertilizers
makes the practice unprofitable. Interest has, therefore, been diverted to other sources of enrichment of the water, such as use of animal manure which causes algal blooms, provides feed for the fish, and also serves as a source of nutrients for microorganisms present in the water. In Ghana poultry waste, blood waste, sewage, cow dung and pig dung are mostly used to fertilize fishponds and are considered superior to inorganic fertilizers in producing and maintaining desirable species of planktonic and benthic organisms in fresh and brackish water ponds [1]. Some farmers make regular application at three or four months intervals. Others depend on visual observation and add the waste according
to the colour of the pond.