244 
Table IV. - Black Ducks Banded in Eastern Bay 
Immature ADULT 

Male Female Undetermined Male Female. 
65 47 1 3 © 12 
Summary 
The data obtained in 1953 indicate that there is an excellent possibility of 
obtaining yearly indices to waterfowl production in Maryland by the use of aerial 
transects. Since no comparable data of previous years are available, no conclusions 
concerning the relative success of the 1953 season can be made. 
The nesting study indicates a substantial resident black duck population in the 
Eastern Bay area. Heavy predation and considerable nest abandonment causes much 
renesting and spreads the hatching period. 
