98 
BULLETIN OF THE UNITED STATES FISH COMMISSION, 
Tlie following table gives a record of the experiments. The percentage of sea 
water is reckoned by taking pure sea water as a standard of 100, a mixture of equal 
parts of fresh and sea water being 50 per cent. The percentage of dead alevins at any 
one time is hot based on the original number with which the experiment began, but on 
the number left in the vessel the previous day, e. g., if we start with 40 alevins and 
10 die the first day, that is 25 per cent; if 15 die the second day, that is 50 per cent. 
Table showing effect, of salt water on alevins. 
Percentage died. 
Day of 
experi- 
ment. 
Exp. 1. 
Exp. 2. 
Exp. 3. 
Exp. 4. 
Exp. 5. 
Exp. 6. 
Exp. 7. 
Age. 
Presli 
water. 
25 per 
cent sea 
water. 
50 per 
cent sea 
water. 
75 per 
cent sea 
water. 
Sea water. 
Few 
changed 
from No. 
2 to 50 per 
cent. 
Few 
changed 
from No. 
6 to 75 per 
cent. 
i 
6 
0 
0 
0 
0 
0 
0 
0 
20 
100 
0 
3 
8 
0 
2 
0 
100 
0 
0 
4 
9 
0 
0 
100 
0 
100 
10 
0 
0 
0 
6 
11 
12 
(1 
0 
100 
0 
0 
8 
13 
0 
0 
9 
14 
0 
0 
in 
15 
o. 
ii 
16 
0 
0 
3 
12 
17 
0 
13 
18 
19 
(1 
0 
14 
0 
0 
15 
20 
0 
0 
10 
21 
2 
17 
17 
??■ 
0 
0 
IS 
23 
(1 
19 
24 
0 
0 
20 
25 
0 
0 
21 
20 
0 
0 
23 
27 
0 
8 
23 
28 
0 
0 
24 
25 
29 
2 
0 
30 
0 
0 
20 
31 
0 
0 
27 
28 
33 
33 
0 
1) 
2 
0 
39 
34 
0 
0 
30 
0 
0 
31 
36 
Discontinued. 
Day of 
experi- 
ment. 
Age. 
Percentage died. 
Density raised gradually to — 
Placed 
directly 
into sea 
water. 
Experiment 12. 
25 per cent. 
50 per cent. 
75 per cent. 
Age. 
Percents 
age sea 
water. 
Percent- 
age died. 
Exp. 8. 
Exp. 9. 
Exp. 10. 
Exp. 11. 
i 
13 
0 
0 
0 
0 
19 
50 
0 
2 
13 
2 
0 
85 
100 
20 
50 
0 
3 
14 
0 
7 
50 
21 
50 
50 
4 
15 
5 
8 
100 
22 
50 
7 
10 
0 
7 
23 
50 
0 
6 
17 
29 
89 
24 
50 
33 
50 per cent. 
7 
18 
ii 
10 
25 
50 
43 
8 
19 
9 
100 
26 
50 
0 
9 
20 
0 
27 
50 
50 
10 
21 
10 
28 
75 
0 
11 
22 
15 
29 
75 
50 
12 
23 
45 
30 
75 
100 
13 
24 
8 
14 
25 
63 
15 
26 
50 
15 per cent. 
25 
16 
27 
17 
28 
33 
18 
29 
100 
