An experiment was conducted in outdoor concrete tanks (4.9 m x 4.8 m x 1.75 m) at
the Institute of Agriculture and Animal Science (IAAS) of Nepal to evaluate the growth of
grass carp and Nile tilapia fed with napier grass in polyculture, to evaluate water quality
regimes of pond water, to determine the compositions of foods consumed by Nile tilapia, and
to determine the optimal ratio of grass carp to Nile tilapia in polyculture