AGE AND GROWTH OF THE CISCO 
283 
same groups at the end of the second year of life appear in table 61. Table 62 shows 
the frequency distribution of the increments of growth during the second year of 
life. All of these data are presented graphically as percentage frequencies in figure 9. 
Figure 9.— Percentage frequency distribution of the 1931 samples of 1928 and 1929 year classes of Muskellunge Lake cisco with 
respect to calculated lengths at end of first year of life (below at left), the calculated lengths at end of second year of life (below 
at right), and calculated increments of growth during second year of life (above). 
Table 61. — Muskellunge Lake cisco, 1931 — Frequency distribution by 5-millimeter intervals of the 
calculated length at the end of the second year of life as based on the II group and the III group 
Age group 
Length interval 
Total 
number 
120-124 
125-129 
130-134 
135-139 
140-144 
145-149 
150-154 
155-159 
160-164 
II 
5 
16 
61 
82 
28 
29 
25 
8 
4 
258 
III 
4 
16 
53 
76 
92 
67 
31 
8 
347 
Table 62. — Muskellunge Lake cisco, 1931 — Frequency distribution by 5-millimeter intervals of the 
calculated growth during the second year of life as based on the II group and the III group 
Age group 
Length interval 
Total 
number 
20-24 
25-29 
30-34 
35-39 
40-44 
45-49 
50-54 
55-59 
60-64 
65-69 
70-74 
75-79 
II 
1 
8 
44 
68 
58 
44 
18 
13 
3 
1 
258 
Ill 
i 
16 
35 
65 
53 
69 
65 
37 
14 
1 
i 
347 
