358 BULLETIN OF THE BUREAU OF FISHERIES. 
TABLE 23.—Gas CONTENT OF Swim BLADDERS OF PERCH.@ 
Cubic centimeters 
Time left in oxygen-free water. Gases in swim bladder. Respira- of gases in water 
tion per liter, 
Depth) 2 Sed eat De 7 NOT quo- 
Date: (meters). tient 
: Per Per Per COs 
Down. On deck. cent cent cent O2 CO:. oO. 
COs. O2. 2 
aoe 
Agg. 235.2) ste... COR? | NOUS. Fo restaa: deat Case 2-03 53-76 44.21 
(b -68 44-64 54-68 
(o “70 51-12 48-17 
(d or 47-83 51-26 
DNC Oy Ge sear ts 24 50:97 48-79 
b 33 41-17 58-50 
(0) Jaa | sees ec Deere he 108 44:51 55-39 
12 32 minutes. 3 minutes. 833 28.12 71-05 
12 d 7 minutes 4 22-35 77-24 
12 -| 3 Minutes -175 37-30 62-53 
12 6 minutes. +099 28.18 91-73 
Bpg406..odonse-o-d (>) : 42 38. 26 61.31 
(De | Geen beh ; 65 13-74 85.62 
13 2minutes.... I-at 7-87 90-92 
Xo ORs tsicn 5 minutes..... +4 11.06 88.55 
X35) Bl steteles 8 minutes..... +43 14-69 84-88 
5 heed eae do. yo minutes... . aI4 12-3 87-36 
13 1.5 hours 211 24-24 75-50 
13 d 31 19-66 80. 03 
13 gr 22-51 77-18 
13 Ir 17-90 81.99 
AT 2 yo ae SAE Ae (>) 64 18. 51 80. 85 
13-5 i 12 +73 99-15 
13-5 ..do. 9 minutes. 170 4.08 95-74 
Aatgsr. . obs seen and (Dig Tae Se Se i Re oh me 21 8.0 or. 78 
13-5 | 1.1 hours 1 minute +43 37-06 62.50 
ELH eee do 8 minutes +24 5-8 93-96 
13-5 | 2 hours 4 minutes 21 417 95-62 
T3eiS tl doses b. .| 6 minutes 044 28.21 71-75 
TZ A15 || - 1 se Ge -| 9 minutes. os 27-09 72-86 
13-5 12 minutes. 26 20. 51 79+ 23 
Hepteasisees ae seaay OP tee | Oe Obmrartiondece) Gana weer 33 28.24 91-43 
2 89 25-93 73-18 
2 62 34-12 65.26 
2 71 25-65 73-64 
2 24 32-43 67-33 
2 25 25-06 74-68 
Septerahe co sodee act 3 2673 28.65 68. 63 
Vc all Reae pa Sele HP 78 29- 61 69. 61 
13-5 1.20 24-78 74-02 
433.5 +25 25-31 74-44 
13.5 +43 9-96 89. 61 
433.5 3-0 14.19 82.81 
433.5 |.....do.........| 8 minutes..... 1.09 II-20 87-71 
@ Some individuals had been near the surface of Lake Mendota; others had been in the stagnant water below the thermocline, 
where there was practically no oxygen. 
> Surface. 
¢ These individuals were caught at a depth of less than 2 m. in University Bay. 
d@ These individuals were kept on the deck of a boat in stagnant water pumped from 13.5 m. 
— 
