With a phosphorus and nitrogen content of Tilapia of 1.6 % and 2.7 % live weight respectively (Lovell, 1989) and using mean annual production of Tilapia of 1,600 kg/hectare/yr in cow manure fed ponds (Racocy and McGinty,1989), an estimated 25.5 kg P and 43 kg N ha−1 y−1 removal is achieved.