252 
BULLETIN OF THE BUREAU OF FISHERIES 
Table 36. — Calculated growth of 8 age groups of the 1930 Silver Lake cisco collections up to the time of 
capture in the summer, compared with the growth for the entire summer of 1930 calculated from 
collections of the same year classes in 1931 
[Number of specimens in parentheses] 
Year 
class 
Date of capture 
Age at 
time of 
capture 
Growth in 
summer up 
to time of 
capture 
Growth in 
entire sum- 
mer based 
on 1931 col- 
lections 
1925 
Aug. 9. 10, 15, 1930 
V 
8 (25) 
10 (58) 
14 (25) 
12 (21) 
14 (108) 
17 (102) 
1926 
Do 
IV 
1927 
Do 
III 
The 1931 Clear Lake cisco samples were collected in two groups, the first from 
July 22 to 28, and the second from September 2 to 5. Tables 37 and 38 show the 
calculated growth during 1931 up to these 2 periods of capture for 7 age groups (sexes 
considered separately) and also the entire 1931 growth for these age groups as cal- 
culated from 1932 collections of the same year classes. Although there are several 
irregularities in the tables it can be seen at once that much of the season’s growth 
occurred after the latter part of July and that growth was by no means entirely com- 
pleted in early September. If all age groups are considered together, the males taken 
in late July had completed 64 percent of their 1931 growth while those taken in early 
September had completed 81 percent of the season’s growth; the same data for the 
females are 68 percent for the July samples and 76 percent for the September samples. 
From these facts it may be concluded that the growth of the Clear Lake cisco prob- 
ably continues through September and possibly into October, and further that the 
growing season of the Clear Lake cisco is longer than in any of the other three lakes. 
Table 37. — Calculated growth of 7 age groups of the Clear Lake cisco (males) up to the time of cap- 
ture in the summer of 1931, compared with the entire 1931 growth calculated from the same year 
classes in the 1932 collections 
[Number of specimens in parentheses] 
Year class 
Age at 
time of 
capture 
in 1931 
1931 
growth 
up to 
July 22-28 
1931 
growth 
up to 
Sept. 2-5 
Total 1931 
growth 
based on 
1932 col- 
lections 
Year class 
Age at 
time of 
capture 
in 1931 
1931 
growth 
up to 
July 22-28 
1931 
growth 
up to 
Sept. 2-5 
Total 1931 
growth 
based on 
1932 col- 
lections 
1924 
VII 
8 (7) 
9 (6) 
13 (2) 
18 (6) 
5 (1) 
10 (5) 
11 (7) 
13 (9) 
1928 __ 
III 
27 (16) 
51 (27) 
55 (16) 
33 (10) 
61 (7) 
77 (4) 
42 (11) 
70 (23) 
105 (20) 
1925 
VI 
1929 
II 
1926 
V 
14 (2) 
22 (4) 
16 (2) 
1930 
I 
1927 
IV 
24 (7) 
Table 38. — Calculated growth of 7 age groups of the Clear Lake cisco (females ) up to the time of cap- 
ture in the summer of 1931, compared with the entire 1931 growth calculated from the same year 
classes in the 1932 collections 
[Number of specimens in parentheses] 
Year class 
Age at 
time of 
capture 
in 1931 
1931 
growth 
up to 
July 22-28 
1931 
growth 
up to 
Sept. 2-5 
Total 1931 
growth 
based on 
1932 col- 
lections 
Year class 
Age at 
time of 
capture 
in 1931 
1931 
growth 
up to 
July 22-28 
1931 
growth 
up to 
Sept. 2-5 
Total 1931 
growth 
based on 
1932 col- 
lections 
1924 
VII 
9 (16) 
12 (6) 
12 (1) 
26 (2) 
7 (5) 
12 (6) 
13 (1) 
26 (2) 
12 (8) 
18 (12) 
16 (1) 
32 (7) 
1928 
III 
31 (18) 
55 (27) 
36 (7) 
60 (8) 
44 (14) 
1925 _ 
VI 
1929 
II 
77 (21) 
1926. _ 
V 
1930 
I 
63 (14) 
78 (4) 
105 (13) 
1927. - 
IV 
