6 BULLETIN OF THE BUREAU OF FISHERIES 
In connection with the first test of the season at Station B we have the follow- 
ing data: 
August IS, 1921, Station B 
Depth 
47J feet 
50 feet 
52} feet 
55 feet 
60 feet 
Temperature, °F 
66.3 
2. 95 
7. 5 
56.5 
0.3 
7 
53.9 
0.06 
7 
Oiygen, c. c. per liter 
4.69 
8. 2 
0. 77 
7.2 
pH A 
At 3.15 p. m. four or five perch (1 or 2 years old) were put in each of the four 
cages, which were placed at the 47^, 50, 52^, and 55 foot levels. About one hour 
later the cages were raised and examined as well as the rough water would permit 
without undue rough treatment of the fish. Of those in each of the two upper 
cages about one-half seemed to be in good condition and the others were ailing. 
Those of the two lower cages were all dead or dying. The cages were next raised on 
the morning of the 15th, when the fish were all found to be dead and more or less 
bruised. 
The last test at Station B and the last of the entire series was in some ways quite 
significant. Fish were placed at 7.30 p. m. on August 22, but the records were 
obtained on the following day. 
August 23, 1921, Station B 
Depth 
52J feet 
55 feet 
57} feet 
60 feet 
62} feet 
65 feet 
Temperature, °F . 
65 
64. 5 
64 
60 
54.6 
Oxygen, c.c. per liter . 
4. 87 
4. 87 
4.87 
4. 65 
1.93 
0. 35 
pH 
8.3 
8. 3 
8.2 
7.7 
7.3 
7. 1 
Five bullheads, 1 smallmouth black bass, and 8 young perch were put in a cage, 
which was placed at the 52 J-foot level. The fish that had been in a cage at the 45- 
foot level at Station A were placed at 55 feet. The fish and cage that had been at 
47^ feet at Station A were placed at 57^ feet. Several young bullheads of the 
season were also included in this cage. At 10 a. m., after the data in the table above 
had been secured, the cages were raised, and it was found that the fish that had been 
at 52^ feet were in good condition, with the exception of one perch that had died and 
was removed. Those that had been at 55 feet were in good condition, except a 
perch and a yearling sucker that had died and were removed. Those that had been 
at 57^ feet were in good condition, except a perch that had died and one that was 
ailing. These were removed and several fresh specimens were added to this cage, 
including a few perch, a smallmouth black bass, and two mud minnows. Each of 
the cages was now placed at a level 5 feet b elow that which it had previously occu- 
pied. The one that had been at 52^ feet was now placed at 57J feet and the others 
at 60 and 62^ feet, respectively. At 2.10 p. m. the cages were again raised, and it 
was found that in the one that had been at 57^ feet all of the fish were in good con- 
