Invasive Species Compendium

Detailed coverage of invasive species threatening livelihoods and the environment worldwide

Abstract

The advantages of mosquito biocontrol by stocking edible fish in rice paddies.

Abstract

Edible fish stocked in rice fields at a density of 600-800 fry per mu (1 mu = 1/15 hectare) for 150-170 days may act as an effective mosquito biocontrol agent. In Guanzhou county, Guangxi, China, common carp (Cyprinus carpio), grass carp (Ctenopharyngodon idella) and Tilapia spp. killed late-stage larvae and pupae of Anopheles sinensis and Culex tritaeniorhynchus in laboratory and field trials. Stocking of fish in experimental rice fields decreased larval numbers significantly in comparison with control areas. Expansion of fish stocking in rice fields on a large scale over several years correlated with a marked decrease in malaria transmission. The addition of fish to the rice fields also resulted in increased rice yields. A ditch-ridge system of field arrangements is described for optimization of fish handling. Preliminary cost-benefit analysis indicated that this approach to mosquito control conveys considerable economic advantage and thus provides incentive to the community to participate in vector control programmes.