236 
BULLETIN OF THE BUREAU OF FISHERIES 
Table 24. — Length frequencies ( 10-millimeter intervals ) of each age group of the Clear Lake cisco 
(males) in each year’s collection 
Length 
I 
II 
III 
IV 
V 
VI 
VII 
VIII 
IX 
1931 
1932 
1931 
1932 
1931 
1932 
1931 
1932 
1931 
1932 
1931 
1932 
1931 
1932 
1931 
1932 
1932 
360 to 369 
2 
350 to 359 
1 
1 
1 
340 to 349 
3 
1 
5 
1 
1 
330 to 339 
2 
1 
2 
1 
5 
1 
2 
1 
320 to 329 - _ 
3 
1 
3 
2 
2 
2 
2 
2 
310 to 319 . 
1 
2 
6 
4 
1 
i 
5 
i 
300 to 309 . 
1 
2 
2 
2 
1 
290 to 299 
10 
10 
280 to 289 
8 
4 
1 
270 to 279 .. 
5 
1 
3 
4 
i 
260 to 269 
5 
8 
3 
250 to 259 
14 
4 
1 
240 to 249 - 
5 
5 
230 to 239 
3 
1 
220 to 229. __ 
1 
210 to 219 
1 
i 
i 
200 to 209 
1 
190 to 199 
1 
180 to 189 
4 
5 
170 to 179 
8 
10 
160 to 169 
5 
5 
Average.. 
178 
176 
253 
254 
285 
290 
317 
314 
325 
320 
326 
320 
331 
336 
338 
345 
355 
Table 25. — Length frequencies ( 10-millimeter intervals) of each age group of the Clear Lake cisco 
( females ) in each year’s collection 
Length 
I 
II 
III 
IV 
V 
VI 
VII 
VIII 
IX 
X 
XI 
1931 
1932 
1931 
1932 
1931 
1932 
1931 
1932 
1931 
1932 
1931 
1932 
1931 
1932 
1931 
1932 
1931 
1932 
1931 
1932 
1932 
380 to 389 
2 
1 
370 to 379 
2 
1 
1 
1 
1 
360 to 369 
3 
2 
3 
2 
1 
350 to 359 
1 
1 
3 
3 
7 
5 
1 
1 
340 to 349 
1 
2 
1 
4 
4 
7 
3 
1 
330 to 339 
2 
6 
2 
3 
4 
1 
1 
320 to 329 
2 
1 
3 
1 
2 
1 
3 
310 to 319. - 
5 
9 
3 
2 
1 
300 to 309 
8 
10 
290 to 299 
1 
6 
1 
280 to 289 
3 
4 
270 to 279 
6 
4 
260 to 269 
11 
2 
i 
250 to 259 
10 
7 
240 to 249 
3 
230 to 239 
1 
220 to 229 
210 to 219 
200 to 209. 
4 
190 to 199 
1 
1 
180 to 189 
8 
2 
170 to 179 
5 
7 
160 to 169 
150 to 159 
1 
Average 
186 
176 
264 
262 
302 
308 
334 
329 
338 
342 
339 
320 
344 
362 
354 
356 
351 
368 
376 
379 
378 
There are some disagreements between the length distributions of fish of the 
same age, but taken in different seasons. Some of these differences, particularly 
in the younger age groups, are due to the variation in the time of the collection of the 
sample within the growing season. The I groups of Clear Lake will serve as an 
example. (See tables 24 and 25.) In 1932 these ciscoes were collected from 
July 12 to July 19, while in 1931 they were taken during two periods, July 22 to July 
28 and September 3 to September 5. Since the September samples averaged more 
in length (the average length of the September fish was about 200 millimeters) than 
the July samples, their presence accounts for the greater upward extension of the 
length distribution of the 1931 I-group Clear Lake ciscoes. However, at least some 
