that roughly 30 percent are adults. By deducting the assumed number o. adultes 
from the eatimated total population, one arrives at approximately 355,000 
waterfowl] raised in eastern Washington. We feel that this is a Terry conservra-~ 
tive figure aince our estimated percentages of total resident waterfowl tabu- 
Tated are probably High in some of the areaa, 
Table ¢. -- Average Brood Size of Ducks by Age Glagsification 
f Ea Ww Iynzto 949 
(Total number of broods listed above average brood size) 

19428 1444 
Species “1/3 if2to 2/3 2/3 to grom -1/3 1/2 to 2/3 2/3 to grown 
Mallard 29 ae 79 Fe 107 17a 
7. 56 6.27 6.84 Z.13 6.43 6.06 
Gadwalt £5 a0 a’ av 44 13 
7.85 7.90 7,66 ®) 7,307 7.0 
Redhead 15 7 le 43 75 21 
6,13 3.71 5.c5 7 oo 6.21 5,58 
Cinon. teal and 10 5 5 66 114 ves 
B-w, teal 6.9 46 7.53 Fwd 6.88 7.42 
Ruddy a4 13 3 Pa! a5 6 
6,71 4,61 a. Ll 6,22 5. 60 4,50 
G-w. teal 11 3 9 5 2? 41 
7.fe 9.37 6.77 6.6 6.0 6,68 
Baldpate 16 1d 4 Ff 45 o4+ 
& .66 6.63 3,75 5.45 6.16 6,65 
ScAup a6 6 z a4 13 10 
tz 6.66 7.0 6.55 7.26 7.8 
Pintail 4 a iz 5 1G 1? 
2,76 6.03 7.2865 6.2 6.6 5.7 
Shoreler a 3 > J i? 28 
B66 9.6 6.44 A, 5,66 6.29 
Wood duck 1 1 
4,0 z.1 
American mergenger 1 z 1 
2,9 6,0 2,0 
Galden-eye i 2 1 J 6 
£0 10,6 6,9 7,5 £.5 
Canrasvack 1 5 a 5 
4,0 6.6 7.66 &, 80 
Ring-necked duck 2 i} 
2,5 5,0 
Unidentified 10 a ? 13 a 16 
Brood 5.6 AO 7.43 6.08 5.76 7.37 
Total euD il? 174 Sle be 456 
7,19 6.63 6.13 7.15 6,47 6.56 
