Wildlife biologist John Beckstrand said they have picked up 5,000 dead ducks to limit the spread of the disease, and there are probably 5,000 more hidden in the tule plants that they couldn't find. About 90 percent of them are mallards, but there are also pintails, greenwing teal and shovelers. An analysis by Fish and Wildlife has determined that if the Klamath Basin Restoration Agreement were in force this year, there would be 48,000 acre feet of water — enough to cover 48,000 acres one foot deep — for the wildlife refuges, Baun said. Jim McCarthy of the conservation group WaterWatch said Fish and Wildlife also needs to change a policy that allows farmers to grow crops on the refuges, which mean less water for marshes.