Two experiments were conducted at CelAgrid, Kandal Province, each for a period of 80days.
In Experiment 1, 12 ponds, each with area of 10m2
, were used to compare four treatments arranged in a
2 x 2 factorial with a completely randomized design with 3 replicates. The first factor was fertilizer
with effluent and no effluent; the second factor was stocking density of 3 or 5 fish per m
2
. The fish in
each pond were provided with feed at 5% of the fish biomass (DM basis). The feed contained 25%
water spinach, 25% duckweed and 50% rice bran (DM basis). The effluent from a bio-digester was
applied every 7 days, at rates equivalent to 150 kg N/ha.