TABLE B-18.—Waterfowl production index, by species, 
Nevada, 1963 and 1964 
Species 
1963 
1964 
Percent 
change 
from 1963 
Ducks: 
Dabblers: 
Mallard- 
729 
1,014 
+39 
Gadwall- 
523 
923 
+76 
American widgeon - 
— 
— 
Green-winged teat- - 
63 
35 
-44 
Cinnamon teal- 
349 
1,908 
+446 
Shoveler- 
46 
30 
-35 
Pintail- 
349 
835 
+139 
Subtotal- 
2,059 
4,745 
+130 
Divers: 
Redhead - 
689 
1,209 
+75 
Canvasback- 
170 
125 
-26 
Scaup - 
23 
— 
_ 
Ruddy duck- 
128 
398 
+210 
Subtotal- 
1,010 
1,732 
+71 
Total ducks- 
3,069 
6,477 
+111 
Canada goose- 
615 
712 
+16 
TABLE B-19.--Duck numbers, aerial surveys, Utah, 1963 and 1964 
Route flown 
Box Elder 
County 
Weber 
County 
Davis 
County 
Jordan 
River 
Clubs 
Salt 
Lake 
County 
Utah 
County 
Total 
Area sampled (sq. mi.)- 
48.0 
15.5 
14.2 
6.2 
6.7 
18.0 
108.6 
Ducks: 
Number counted: 
1963- 
2,076 
1,039 
1,160 
710 
69 
464 
5,518 
1964- 
2,595 
1,050 
1,056 
564 
33 
280 
5,578 
Number per square mile: 
1963- 
43.3 
67.0 
81.7 
114.5 
10.3 
25.8 
50.8 
19 64- 
54.1 
67.7 
74.4 
91.0 
4.9 
15.6 
51.4 
Percent change, from 1963 - 
+25 
-- 
-10 
-20 
-52 
-40 
no change 
63 
