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Many countries are in search of more effective and sustainable methods for controlling dengue vectors, due to undeniable inefficiencies in chemical and mechanical vector control methods. Bio-control of vectors by copepods is an ideal method of using interactions in the natural ecosystem for vector management, with minimum consequences on the environment. Current study determined the predatory efficacy of five locally abundant copepod species on,  Aedes  larvae under laboratory conditions. Copepods were collected from the pre-identified locations within the districts of Gampaha and Kandy, and identified morphologically. Individual species of copepods were maintained as separate colonies with  Paramecium  culture and wheat grain as supplementary food. Five adult copepods of each species was introduced into separate containers with 200 larvae (1 st  instar) of  Aedes aegypti . Number of larvae survived in containers were enumerated at 3 hour intervals within a duration of 24 hours. Each experiment was repeated five times. The same procedure was followed for  Ae .  albopictus . Significance in the variations among predation rates was evaluated with General Linear Modelling (GLM) followed by Tukey’s pair-wise comparison in SPSS (version 23). Significant variations in predation rates of studied copepod species were reported (p<0.05), whereby  M .  leuckarti  indicated the highest followed by  M .  scrassus , while  C .  languides  indicated the lowest predatory efficacy. The effect of different  Aedes  larval species on the predation rates of copepods remained significant (p<0.05), even though the effect on predatory efficiency was not significant. Based on the findings, both  M .  leuckarti  and  M .  scrassus , with the highest predatory efficiencies, could be recommended as potential candidates for biological controlling of  Aedes  vectors in Sri Lanka.

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Predatory efficacy of five locally available copepods on Aedes larvae under laboratory settings: An approach towards bio-control of dengue in Sri Lanka