Abstract
Abstract. Field trials on aquatic weed control with grass carp fry (1·5 g and 1·7 g average weight) were conducted in drainage channels of an irrigated area near Cairo. Growth and survival of the fry were assessed and their effect on the aquatic vegetation, after excavation of the drains, studied. Although survival was moderate (17–36%), growth (0·06-0·07 g/day) ensured a sufficient biomass, over 100 kg/ha, for weed control. Regrowth of submerged weeds was effectively prevented. Emergent weeds were not suppressed completely, but with their additional control, complete weed control can be expected after one year, when the fish are large enough to consume emergent weeds as well.
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