146 
Production Summary; 
Estimated Total Nesting Pairs 
Total Fall Population 
Species 1949. 1950 1951 1952 1949 1950 1951 1952 
Canada geese 2,600 1,300 1,500 640 16,900 10,300 11,500 5,040x 
Mallard 3,500 3,250 3,600 2,270 26,000 26,300 27,500 18,600 
Gadwall 3,500 5,500 6,000 3,200 30,000 48,100 50,000 27,200 
Pintail 380 505 400 440 3,625 6,510 3,400 3,230 
G-w. teal 150 80 100 0 1,700 1,100 1,000 0 
B-w. teal 250 295 150 100 2,200 2,560 1,250 710 
Cinn. teal 1,700 2,300 2,000 },210 16,000 23,000 18,000 9,100 
Shoveler 550 510 600 760 6,400 5,900 6,000 6,080 
Redhead 4,300 5,000 4,800 2,800 31,000 49,400 45,000 22,100 
Scaup 800 850 1,000 1509 6,000 8,400 9,000 1,230 
Ruddy duck 2,000 3,200 5,000 1,350 18,000 29,900 38,000 8,600 
Others 300 260 300 20 3,000 2,400 3,000 140 

Total (ducks) 17,430 21, 750 23,950 12,300 143,925 203,570 202,150 96,990 
Coots 5,000 5,000 6,000 3,900 31,500 36,0090 40,000 24,000 
* Includes 1,600 non-breeding birds. 
e. Remarks: This important area has experienced significant 
changes in personnel and methods of estimating waterfowl production. The 1952 
figures indicate an approximate 50 percent decrease in nesting ducks and a 
65 percent decrease in nesting Canada geese. This decrease almost certainly 
does not represent a change in population but rather a change in subjective appraisal. 
The The figures are included for the purpose of establishing a future reference point in 
subsequent years. 
7. South San Joaquin Valley. 
a. Area - Not determined. 
b. Type- Flooded river channel, old lake bottoms and agricultural land. 
c. Coverage - Aerial - approximately 15 percent. 

d. Results: 
Species Estimated Total Nesting Pairs 
Mallard 1,700 
Gadwall 290 
Cinn, teal 190 
Redhead 70 
Pintail 40 
Shoveler 10 
Tree duck 20 
Total 2,320 
Coots 2,600 
