340 BULLETIN OF THE BUREAU OF FISHERIES. 
TABLE 2.—ToTaL AND ComMPARATIVE NUMBER oF PercH Caucut in Gu Nets SET at VARIOUS 
Depts 1n Lake MENDoTA, JULY 2 To DEC, 14, 1915, WITH NoTES ON THE AMOUNTS OF OxYGEN 
AND CARBON Di0xIDE PRESENT. 
Cubic centimeters 
of gases per liter. 
Depth 
net set 
(meters). 
Date. 
oO. CO. 
Number of perch caught, 
Average per hour at— 
Total. 
o-5 m. 5-10 m. Io~IsM.| 15-24 m, 
~7 |. 31 
19-0 54 
6.0}. I2 
3-5 |- ° 
18.5 |. 94 
br8.5 |. 17 
INOW urges adn ciawe heen b 13.0 |. 20 
13-0]. 94 
40]. ° 
3-0}. ° 
14-6 |. 23 
3-5 |. 7 
3-5]. I 
16.3 |. 41 
2r.0}. 32 
3-5]. 2 
12-5 |. 47 
35 2 
©909700000000000000000008aNn 
@ All nets used were 1-inch bar mesh, measuring 3 by 75 feet, except those marked >, which were 34-inch bar mesh, measuring 
4 by sofeet. For some reason the latter caught only one-fifth as many perch as the former, as is demonstrated by the catches 
on Noy. 6 and 13. 
» See note under a. 
