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Articles by J.R. Sara
Total Records ( 1 ) for J.R. Sara
  S.N. Hlophe , N.A.G. Moyo and J.R. Sara
  Plant based protein sources may be the only solution to reduce high feed costs in aquaculture. The use of kikuyu grass meal as a dietary protein replacement for fishmeal in practical diets for Tilapia rendalli was evaluated. To determine the optimum substitution level, kikuyu grass meal was used to replace 20, 40, 60 and 80% of fishmeal in isonitrogenous (CP = 16.70%) and isocaloric (GE = 15.20 MJ kg-1) diets. The test diets were fed to triplicate groups of fish held in 1 m3 fibre glass tanks at 10 (36±2 g) fish per tank for 60 days. The best specific growth rate (1.60 g day-1) and feed conversion ratio (1.86) were recorded for fish fed diets with 20% kikuyu grass meal. The lowest specific growth rate (1.29 g day-1) and feed conversion ratio (2.56) were recorded for fish fed diets with 80% kikuyu grass meal. When the level of kikuyu grass meal was more than 20% in the diet, growth performance was reduced. However, there were no statistical differences in the growth performance indices measured across the tested diets. The observed reduction in growth for diets containing higher kikuyu grass meal is explained by the decreasing amino acids levels (particularly methionine and lysine) and increasing fibre content. This suggests that kikuyu grass meal is a suitable protein replacement for the expensive fishmeal in T. rendalli practical diets when it constitutes up to 20% of the dietary protein.
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