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In order to determine the optimal dose of rabbit manure for plurispecific production of fresh water zooplankton in
controlled area, the effects of six different doses of dry rabbit manure (T1 = 300 g/m3, T2 = 600 g/m3, T3 = 900 g/m3, T4 = 1200 g/m3,
T5 = 1500 g/m3, T0 = 0g/m3) on physico-chemical and biological parameters of areas were monitored for 27 days in cultures realized
in plastic buckets of 80 L capacity each. Manures are from rabbits fed with diet previously revealed favorable to their growth, and is
made of 2% of dried cassava, 30% of maize bran, 10% of palmist cake, 10% of soya cake, 5% of cotton cake, 2% of shell, 10% of
malt, 5% of beer yeast, 10% of Panicum maximum and 1% of salt. Six days after fertilization, buckets were seeded with zooplankton
by 26 individuals per liter (ind/L). Results obtained show that the supply of rabbit manure has improved chemical properties and
microalgae production (phytoplankton) with treatments T1, T2, T3, T4 and T5. Optimal conditions of zooplankton production through
phytoplankton are obtained with doses in T2 and T4 which present the best specific growth rate. The daily production through the
highest phytoplankton biomass (chlorophyll-a) has been obtained with dose in T5. Thus, doses 600 g/m3 and 1200 g/m3 of rabbit
manure may be considered optimal for a plurispecific production of fresh water zooplankton. It was noted that Rotifers were
predominant in abundance in almost the different culture areas. |