Three different live diets, Eucyclops serrulatus, Ceriodaphnia quadrangula and equal combination of E. serrulatus copepodid and C. quadrangula, were offered to angelfish (Pterophyllum scalare) larvae viz 1-week, 2-week and 3-week old at prey densities of 2, 5 and 10 individuals mL À1 . Results showed that 1-week-old P. scalare larvae consumed E. serrulatus copepodid at a rate of 31.3-56.7 ind. h À1 , C. quadrangula at 8.0-12.0 ind. h À1 , and mixture of E. serrulatus and C. quadrangula at 20.7-40.7 ind. h À1 . For 2-week-and 3-week-old larvae, consumption rate increased accordingly. The electivity indices (E) of P. scalare (1-week-old larvae) for E. serrulatus copepodid were +0.18, +0.23 and +0.22 at prey densities of 2, 5 and 10 ind. mL À1 respectively. Tendency towards E. serrulatus copepodid consumption reduced by aging P. scalare as indicated by the E values for 2-and 3-week-old larvae. However, growth and survival of P. scalare larvae was greatest when fed on combination of copepod E. serrulatus and C. quadrangula.
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