The nutrient content and the release of nutrients from fish food and faeces

The fish food and faeces were fractioned into the different components of phosphorus and nitrogen. There was a rapid release of phosphorus from the fish food and faeces and a decrease thereafter whereas ammonium release was slow at first with the rate increasing with time. Both temperature and pH affected the release of nutrients from fish food and faeces. The release of phosphorus and nitrogen was higher at higher temperatures. The maximum release of phosphorus was at pH 4.0 whereas nitrogen release was maximum at neutral (7.0) to alkaline (10.0) media.