169 
4. North San Joaquin Valley (Grasslands) 
a. Area - 150 square miles. 
b. Type - Gun clubs and flooded pasture lands. 
c. Coverage - Aerial 25 percent 1951, 1952, 1953, 1954. 
d. Production summary: 

Estimated Total Nesting Pairs ‘Total Fall Population 
Species 1951 1952 1953 1954 1951 1952 1953 1954 
Mallard 1,703 2,070 1,420 2,170 8,500 10,350 4,420 £6,950 
Pintail 100 30 80 105 500 150 330 290 
Gadwall 192 280 180 310 1,000 1,400 570 870 
Cinn,. teal 173 340 180 235 900 1, 700 620 530 
Redhead 88 20 60 25 450 100 190 80 
Ruddy duck 28 0 30. 20 160 0 100 60 
Shoveler 12 50 200 10 70 250 640 30 
F. T. duck 0 0 0 5 0 0 0 20 
Others 0 0 0 0 0 0 0 0. 
Total 2,295 2,790 2,150 2,880 11,580 13,950 6,870 8, 830 
Coots 724 960 3,900 250 3, 500 4,800 10,770 l, 370 
e. Remarks: Breeding pairs of ducks increased 34 percent and the fall 
population increased 29 percent. The ruddy duck, shoveler and 
coot are late migrants. Usually these migrants are still present 
in this area when the count is made for breeding pairs (May 20). 
They leave by the middle of June, and thus do not contribute to 
the production of this area. For this reason they are not included 
in this report, but were recorded in the preliminary report. 
5. South San Joaquin Valley 
a. Area - not determined, 
b. Type - Flooded lake bottoms, river channels and agricultural land. 
c. Coverage - Aerial. Variable (10 percent to complete coverage in 
1952 and 1953). In 1954 only 5 percent coverage on rice land and 
complete coverage on remainder, 
d. Production summary: 
