248 
BULLETIN OF THE BUREAU OF FISHERIES 
With respect to average condition, from poorest to best, the populations fall in 
the following order: Muskellunge Lake (sexes combined), Trout Lake (sexes com- 
bined), Silver Lake females, Silver Lake males, Clear Lake males, and Clear Lake 
females. 
The order of the four populations of this investigation with respect to average 
condition is the same as their order with respect to average duration of life (p. 267). 
The indicated association between condition and longevity finds support in the 
observation (table 32, p. 246) that in Trout Lake survival to an advanced age appears 
to be accompanied by, if not contingent upon, a departure from the general tendency 
for condition to become poorer with increased length. 
The study of condition and of the length-weight relationship in these four cisco 
populations may well be concluded with an illustration of how progressive change 
of condition is reflected in a progressive change in body proportions. In order to 
determine the intensity of the excess vertical and lateral growth that produced the 
heavy body form in the older and larger Clear Lake ciscoes the relationship of length 
to depth and width was studied in 95 preserved specimens collected in 1932. Since 
the relationship of length to weight in the Clear Lake cisco can be expressed satis- 
factorily by a parabolic equation it was assumed that a similar relationship may 
hold between length and width and length and depth. On the basis of this assump- 
tion the following equations were derived: 
Male — 46 specimens: 
Depths 5.052 X10 -2 Z 1 - 2939 
Width=0.656X10- 2 Z 1 - 6502 
Female — 49 specimens: 
Depth=5.230X10 -2 Z 1 - 2899 
Width=0.173X10 -2 Z 1 - 7879 
Z= length in millimeters. 
Table 34. — Clear Lake ciscoes, 1932 — Comparison of theoretical and actual values of body depth and 
body width 
Males 
Length 
Calcu- 
lated 
depth 
Actual 
depth 
Calcu- 
lated 
width 
Actual 
width 
165 
37 
36 
18 
19 
175 
40 
38 
20 
19 
181 
42 
44 
21 
21 
206 
50 
49 
25 
31 
26 
235 
59 
62 
31 
255 
66 
68 
35 
35 
266. 
69 
69 
37 
36 
284.. 
76 
79 
42 
41 
292 
78 
81 
44 
43 
302. 
82 
81 
46 
47 
316_ 
86 
87 
49 
43 
326 
90 
89 
51 
51 
334 
93 
91 
54 
56 
345 
97 
92 
56 
63 
Females 
Length 
Calcu- 
lated 
depth 
Actual 
depth 
Calcu- 
lated 
width 
Actual 
width 
150 
34 
34 
13 
13 
165. 
38 
37 
16 
20 
172 
40 
40 
17 
19 
190 - 
46 
48 
20 
24 
265 
69 
68 
37 
36 
274 
73 
72 
39 
35 
295.. 
80 
80 
45 
41 
305 
84 
85 
48 
47 
314 
87 
87 
50 
49 
324 
90 
86 
53 
45 
334.... 
94 
92 
56 
54 
345 
98 
99 
59 
64 
355.. 
102 
105 
63 
67 
362 
105 
111 
65 
69 
376 
110 
111 
69 
65 
383 
113 
109 
72 
59 
Table 34 shows the lengths, depths, and widths from which the above equations 
were calculated. The data of the same table also make possible the comparison of 
actual measured depths and widths with theoretical values calculated from the 
equations. If due consideration is given the small number of specimens the agree- 
ment between the actual and theoretical values of depth and width is, in general, good. 
