The aims of this project were to study intensively the entomological fauna of sewage lagoons including insects, crustacea, mites, spiders, and sowbugs in all sorts of lagoons from the newest, rawest ones to old ones, including primary and secondary lagoons; to investigate predator and prey species in lagoons and determine which predators are most effective in suppressing midges and mosquitoes; to determine whether insect pathogens are present and whether they can be manipulated artificially; and to investigate the possibility of manipulating insect populations in ways which maintain a lagoon in good balance.