A 12-moth study was conducted to determine the effects of waterfowl management practices on mosquito production in Louisiana coastal marshes. An intermediate and brackish marsh impoundment, a marsh pump-out area were studied. The data obtained indicate that waterfowl management practices utilized in the intermediate and brackish marsh impoundments produce significantly (P<0.01) more mosquitoes than practices utilized in marsh pumpouts or natural salt marsh. During the time that the impoundments were flooded the intermediate marsh impoundment produced significantly (P<0.01) larger numbers of mosquitoes than the brackish marsh impoundment. Culex salinarius preferred the intermediate marsh impoundment. Anopheles bradleyi preferred the brackish marsh impoundment. During the time that the impoundments were drained (May through September) Aedes sollicitans eggs were collected in significantly larger numbers (P<0.01) from the intermediate marsh impoundment.