414 
BULLETIN OF THE BUREAU OF FISHERIES 
In February when the fish are only about 9 or 10 months old the range in size 
for 98 specimens is 90 to 162 millimeters (4 to 6.5 inches), and the average length is 
117.5 millimeters (4.7 inches). The year classes are less distinct thereafter, as some 
overlapping probably takes place and, furthermore, our data are too meager to show 
the exact situation. In April, when the fish of this year class are still mostly under a 
year of age, the minimum size is 93 millimeters. There is some doubt relative to 
the maximum size but the average size is not far from 123 millimeters (5 inches), as 
the number that may have been wrongly assigned is too small to affect the average 
appreciably. 
Table 5. — Length frequencies of 6,347 white perch 
[Measurements to nearest millimeter, grouped in 5-millimeter groups] 
Total length 
May 
June 
July 
August 
Sep- 
tember 
Octo- 
ber 
No- 
vember 
De- 
cember 
Janu- 
ary 
Febru- 
ary 
March 
April 
0-4 
966 
918 
6-9 
3 
47 
5 
10-14 
223 
48 
15-19 
176 
102 
20-24 
223 
146 
2 
25-29 
49 
139 
1 
30-34 _ 
5 
148 
35-39 
1 
149 
17 
40-44 
91 
32 
45-49 
71 
84 
2 
50-54 
56 
101 
55-59 .. 
19 
98 
9 
60-64 
9 
71 
26 
65-69 
2 
25 
37 
1 
70-74 
1 
20 
78 
2 
1 
75-79 ...... 
1 
u 
95 
5 
1 
80-84 
5 
110 
5 
3 
85-89 
1 
2 
80 
12 
3 
90-94 
1 
1 
42 
15 
1 
5 
3 
3 
2 
95-99 
1 
34 
11 
2 
11 
11 
8 
1 
6 
100-104 
3 
1 
14 
6 
13 
6 
14 
12 
14 
14 
105-109 
3 
8 
9 
5 
1 
12 
9 
21 
9 
110-114 ... . 
4 
1 
13 
2 
4 
1 
10 
17 
35 
14 
115-119 
1 
1 
2 
8 
1 
9 
8 
5 
40 
11 
120-124 
1 
1 
7 
3 
4 
1 
4 
15 
38 
1 
1 £5-129 
4 
2 
3 
2 
5 
6 
40 
2 
130-134 
1 
1 
29 
2 
3 
9 
15 
1 
135-139 
31 
2 
3 
3 
i 
6 
5 
2 
140-144 
60 
4 
4 
2 
2 
4 
3 
145-149 
1 
5 
4 
1 
1 
2 
150-154 . 
1 
42 
14 
15 
2 
2 
2 
155-159 
5 
110 
1 
20 
22 
1 
1 
1 
160-164 
3 
2 
72 
10 
53 
3 
1 
3 
1 
165-169 
2 
69 
3 
6 
35 
3 
3 
2 
170-174 
1 
3 
2 
7 
34 
4 
5 
1 
175-179 
1 
1 
99 
1 
27 
2 
1 
2 
180-184 
1 
1 
62 
3 
2 
24 
2 
3 
1 
185-189 
20 
14 
1 
1 
1 
4 
190-194 
18 
10 
4 
1 
1 
195-199 
1 
6 
2 
1 
1 
200-204 
1 
4 
2 
3 
1 
1 
2 
205-209 
1 
2 
1 
1 
210-214 
1 
2 
5 
1 
215-219 
1 
220-224 
1 
1 
225-229 
1 
Table 6. — Monthly summaries of length measurements of 5,285 white perch during the first year of life 
Month 
Fish 
measured 
Smallest 
Largest 
Average 
Month 
Fish 
measured 
Smallest 
Largest 
Average 
969 
Millimeter 
1 
Millimeter 
6 
Millimeter 
2.4 
November 
49 
Millimeter 
68 
Millimeter 
143 
Millimeter 
113.0 
1,642 
987 
500 
1 
38 
8.7 
December 
32 
78 
124 
95.6 
July 
9 
76 
31.9 
January... 
72 
74 
146 
109. 1 
20 
92 
55.8 
February 
98 
90 
162 
117.5 
September 
559 
45 
122 
81.0 
March 
233 
98 
204 
123.8 
October ... 
68 
73 
115 
93.2 
April 
76 
93 
195 
122.6 
