AGE AND GROWTH OF THE CISCO 
247 
shows the variation in K according to age, while the earlier tables show the variation 
of K with length. On the whole the changes of K with age depend on differences 
in the average length of the various age groups. In Clear Lake in particular large 
differences in average lengths of age groups are associated with large differences in 
the average value of K, while smaller differences in average length are associated 
with smaller differences in the average value of K. 
Table 33. — Value of K according to age groups 
[Number of specimens in parentheses] 
Age 
Trout Lake 
Muskellunge Lake 
Silver Lake 
1928 
1930 
1931 
1928 
1930 
1931 
1928 
1930 
Male 
Female 
XII 
1. 49 (1) 
1.35 (2) 
XI - 
X 
ix 
VIII - 
1.47 (2) 
VII 
VI. 
1.14 (2) 
1.18 (23) 
1. 21 (139) 
1. 24 (129) 
1.30 (50) 
1.28 (2) 
1. 39 (3) 
1.37 (15) 
1.37 (35) 
1.34 (12) 
1. 26 (4) 
V 
1. 17 (9) 
1.16 (99) 
1. 13 (347) 
1.16 (36) 
1.34 (10) 
1.29 (69) 
1.30 (46) 
1. 29 (9) 
1.19 (1) 
1.38 (10) 
1.42 (23) 
1.38 (13) 
1.28 (3) 
IV 
1.32 (17) 
1.28 (61) 
1. 30 (102) 
1. 24 (2) 
1. 10 (2) 
1. 13 (266) 
1. 26 (229) 
1. 28 (9) 
III 
1.11 (10) 
1. 23 (252) 
1.24 (19) 
1.06 (14) 
1. 07 (214) 
1.18 (17) 
II 
I 
Age 
Silver Lake, 1931 
Clear Lake 
1931 
1932 
Male 
Female 
Male 
Female 
Male 
Female 
XII.. -- - 
XI 
2. 20 (1) 
2.00 (1) 
2. 36 (2) 
2. 16 (8) 
2.09 (12) 
2.50 (1) 
1. 93 (7) 
1.90 (14) 
1.82 (21) 
1.64 (13) 
1.27 (11) 
X. 
2. 15 (1) 
2. 12 (1) 
2.13 (11) 
2.12 (17) 
2. 06 (8) 
2. 10 (1) 
2. 03 (7) 
1.86 (19) 
1.66 (27) 
1.39 (15) 
IX ... 
1.97 (1) 
1.99 (7) 
1. 95 (9) 
1.82 (2) 
1. 93 (7) 
1.83 (11) 
1.70 (23) 
1.56 (20) 
1.25 (20) 
VIII. . . 
1.97 (3) 
2. 00 (6) 
1. 96 (7) 
1. 88 (2) 
1. 86 (5) 
1.73 (17) 
1.66 (28) 
1.38 (18) 
VII... 
VI 
1. 36 (8) 
1.34 (22) 
1.28 (22) 
1.29 (13) 
1. 25 (8) 
1.18 (25) 
V 
1.40 (12) 
1.41 (13) 
1.31 (10) 
1. 30 (4) 
1.22 (24) 
IV. .. 
III 
II 
I 
The analysis of the data was made to include the examination of variation of K 
with size in fish of the same age and the variation of K with age in fish of the same 
size. Without presentation of the extensive tabular material that would be neces- 
sary to show the detailed results of these analyses it may be stated that the variation 
of K with length within an age group proceeds in the same direction as the variation 
of K with length in the population as a whole, and that, on the whole, the value of K 
appears to be independent of age in fish of the same length. 
The tables 28, 29, 30, 31, and 33 show further that condition varies from year 
to year in the same population. In both Trout Lake and Muskellunge Lake the 
ciscoes were slenderer in 1930 than in 1928 or 1931. In Silver Lake the lack of sex 
records for 1928 makes a comparison of that year with later years difficult. There 
is some indication, however, that in 1928 the Silver Lake cisco may have been in 
poorer condition than in 1930. In Clear Lake there do not appear to be any notable 
differences in the condition of the cisco in 1931 and 1932. 
