TABLE F-24, --Duck production survey data, South Dakota, 1953-61 
Square miles sampled- 
Square miles in stratun--- 
Number of broods seen----- 
Brood index 
Percent by age classes: 
Class II 
Class III 

TABLE F-26, --Production survey indexes, by stratum, northern Saskatchewan, northern Manitoba, and western 
Ontario, July 1955-61 
[Index mmbers, in thousands] 

Stratum 
Ontario C 
Ne a 




Number of young:+ 
——se eee ee Eee ee eee ew ee eee 
—<_ Eee eee eee ee 
Ce eee 
Ce eee 
ee ee eee eee eee ee ee ee ee 
1 Number of broods mi1tiplied by average brood size. 
2 as indicated by adult pairs and singles. 
118 
