HABITS OF YELLOW PERCH. 359 
TABLE 24.—PERCENTAGE OF GASES IN THE Swim BLADDERS oF PERCH.? 
Respira- 
Num- | Instag- tion 
Depth ber nant |Average| Most Least |Average| Most Least |Average| Most Least quo- 
(meters). of water CO: CO. CO... On. Or O2. Nz. Na. Nz. tient 
perch. | (hours). CO. ) 
@ Some individuals were examined as soon as taken from surface water; others, after being left in the stagnant water below 
the thermocline. 
‘TABLE 25.—S1ZE OF PERCH AT SEXUAL Maturity In LAKES WINGRA AND MENDOTA, MARCH TO OCTOBER, 
1916. 
Perch examined. Size of perch (millimeters). 
Lake. 
Number. Sex. Maximum.| Minimum.| Average. 
162 | Male...... 178 113 134-9 
158 | Female.... 180 118 137-7 
74 | Male...... 187 115 156-6 
95 | Female.... 201 120 167-6 
