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Waterfowl Surveys in Delaware


For almost 40 years, the Division of Fish & Wildlife has conducted four waterfowl surveys annually to measure long-term trends in duck and goose populations. These surveys are carried out via a small plane with a pilot and biologist aboard, taking similar routes and using the same techniques each time. Some of the thousands of snow geese that migrate annually now to eastern Kent County. Photo courtesy of Joey Melvin.Each survey is flown using the same east-west transects to minimize data bias and allow for across year comparisons. Traditionally and as dependent on weather, flights were usually conducted in mid-October, mid-November, mid-December and the second week in January. The January flight coincides with the nation-wide mid-winter waterfowl survey conducted by the U.S. Fish and Wildlife Service. The traditional once-monthly state surveys cover most of the primary waterfowl habitat in Delaware, as identified by previous waterfowl biologists. The survey area approximately covers the eastern half of the state, and is divided into 11 zones. Since 2010, timing of the aerial surveys have been modified. They are now flown twice monthly, but only in the zones that coincide with greatest waterfowl abundances as identified from analyzing 40 years of survey data.

With any survey method, not every duck and goose can be seen equally well from a plane. The surveys give fairly accurate information about geese, due to their large body size. Some duck species such as wood ducks and sea ducks, are difficult to count due to the wetlands they inhabit or similar plumage characteristics.

Although imperfect, surveys are a useful tool for a waterfowl manager. The importance of conducting these counts and collecting this data provides strength to wildlife managers making informed policy decisions. Examples using long-term population trend data include setting season limits and dates and habitat management. In most cases no single survey count is especially important in itself, but cumulative counts have revealed important changes to waterfowl use of Delaware's wetland habitats over the years.

For example, the state's waterfowl surveys, along with similar surveys conducted in other Atlantic Flyway states, detected declining migrant populations of Canada geese in the 1990's; the reduced use of the Christiana marshes by ducks after Interstate 95 was constructed; and increases in duck abundances at Prime Hook National Wildlife Refuge after successful phragmites and water control. Winter counts are used as a measure of Tundra Swan and American Black Duck annual production. These data are also used in setting season frameworks for Atlantic Brant and other species.

Waterfowl Survey Zones Waterfowl counts are conducted within the following zones:

Zone 1 - Pennsylvania State line south to the Delaware Memorial Bridge (statewide).
Zone 2 - Delaware Memorial Bridge to the C&D Canal (statewide).
Zone 3 - C&D Canal to line from Liston Point to Kenton (statewide).
Zone 4 - Liston Point to Route 6 Smyrna (statewide).
Zone 5 - Route 6 Smyrna to Route 8 Port Mahon (statewide).
Zone 6 - Route 8 to Big Stone Beach, east of Route 113.
Zone 7 - Big Stone Beach to Broadkill River, east of Route 1.
Zone 8 - East of Route 1 from Broadkill River to Lewis-Rehoboth Canal, south of Gordon's Pond.
Zone 9 - South of Gordon's Pond and all of Rehoboth Bay.
Zone 10 - All Indian River Bay west to Millsboro and south to Salt Pond.
Zone 11 - Salt Pond south to Maryland state line and west to Route 17.

Current Waterfowl Survey Data

2016-2017 Hunting Season (early Oct. and Nov. 2016 not available)

Historical Waterfowl Survey Data

2015-2016 Hunting Season
2014-2015 Hunting Season (early Nov. 2014 not available)
2013-2014 Hunting Season
2012-2013 Hunting Season (late Oct. 2012 not available)
2011-2012 Hunting Season (early Nov. 2011 not available)
2010-2011 Hunting Season
2009-2010 Hunting Season
2008-2009 Hunting Season
2007-2008 Hunting Season
2006-2007 Hunting Season
2005-2006 Hunting Season
2004-2005 Hunting Season (Jan. 2005 not availble)
2003-2004 Hunting Season
2002-2003 Hunting Season
2001-2002 Hunting Season
2000-2001 Hunting Season
1999-2000 Hunting Season
1998-1999 Hunting Season
1997-1998 Hunting Season
1996-1997 Hunting Season
1995-1996 Hunting Season
1994-1995 Hunting Season
1993-1994 Hunting Season
1992-1993 Hunting Season
1991-1992 Hunting Season
1990-1991 Hunting Season
1989-1990 Hunting Season
1988-1989 Hunting Season
1987-1988 Hunting Season
1986-1987 Hunting Season
1985-1986 Hunting Season
1984-1985 Hunting Season
1983-1984 Hunting Season
1982-1983 Hunting Season
1981-1982 Hunting Season
1980-1981 Hunting Season
1979-1980 Hunting Season
1978-1979 Hunting Season
1977-1978 Hunting Season
1976-1977 Hunting Season
1975-1976 Hunting Season
1974-1975 Hunting Season (Jan. 1975 not available)

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