Abstract
A field experiment involving sixteen 600-m2 nursery ponds was conducted. to test (1) the efficacy of malathion for selectively killing the copepod predators of larvae of common carp (Cyprinus carpio); (2) prophylactic drug treatment of the carp to avoid bacterial and other infections; and (3) a combination of both treatments. Significant differences were found between the treatment groups (P < 0.01) while differences among the replicates were not significant (P > 0.05). The mean survival of fry was 2.8, 1. 7, and 3.4 times higher using malathion, prophylactic drugs and both combined, respectively, than in the control.
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