This study highlights the importance of risk assessment in provision of scientific information for aquatic health decision making. However, appropriate selection of the risk assessment parameters is crucial. In aquatic health management perspective, the study confirms the eco- nomic importance of monogeneans in aquaculture. Therefore, manage- ment options should consider risk factors which aggravate monogenean infections especially, high stocking density, low water exchange and poor bottom hygiene. For cages, the distance from the shore and the water bed can influence considerably the transmission of oncomiracidia (Akoll et al., in press). Thus, location of cages should emphasize water depth and distance from the shores. Besides, biosecurity measures such as screening fish for monogeneans and application of appropriate treatment, in case of infections, prior to stocking are essential. Although heteroxenous parasites especially trophically transmitted species are frequent in farmed fish, they pose lower threats than monoxenous. Nonetheless, key risk factors necessary for the establishment and prolif- eration of these species must be considered in management options. Importantly, reduced access of birds to culture systems and clearing veg- etation along littoral zones to eliminate the optimum conditions for the occurrence and interaction of snails, various invertebrates, fish and bird is necessary to control parasitic infection. Overall, we recommend sur- veying potential water sources for presence of parasite prior to esta- blishing fish farming facilities and implement systematic monitoring to