Duck Brood Numbers Down Slightly from Last Year. Water numbers down 38%, State Game and Fish Department biologists expect a fall duck flight from North Dakota that is down 8 percent from last year, based on observations from the annual mid-July waterfowl production survey. This year’s brood index came in at 3.68 broods per square mile, down 5 percent from last year. The statewide average since the survey began in 1955 is 2.59 broods per square mile. Overall brood size was up 8 percent from last year. Migratory game bird management supervisor Mike Szymanski said production was better in the northern tier of the state, with northernmost routes experiencing increased counts over last year. "Moving south and east, fewer broods were observed than in 2016," he said. Observers also count water areas during the summer survey, and this year’s water index was 38 percent lower than last year. Due to drought conditions and sparse precipitation since snowmelt, Szymanski said summer wetland conditions are declining. “It was already starting to dry up when we did our spring survey, and the pattern continued,” Szymanski added. “It definitely affected how breeding pairs settled in the state. Temporary and seasonal wetlands were the first to be hit. Luckily, most medium-sized and larger wetlands were only starting to show stress at the time of the survey.” Game and Fish biologists will conduct a separate survey in September to assess wetland conditions heading into the waterfowl hunting seasons. Mallards, gadwall and blue-winged teal are the top three duck species that nest in North Dakota, and together they accounted for nearly 75 percent of the broods observed in the summer survey. Mallard brood numbers were down about 13 percent from last year, gadwalls were down about 4 percent, and blue-winged teal broods were unchanged. Blue-winged teal are typically the most prevalent breeding duck in North Dakota. In addition, pintail brood numbers were down 65 percent. However, shovelers were up 44 percent. The Game and Fish summer duck brood survey involves 18 routes that cover all sectors of the state, except west and south of the Missouri River. Biologists count and classify duck broods and water areas within 220 yards on each side of the road. The survey started in the mid-1950s, and all routes used today have been in place since 1965.