NATURAL HISTORY OF THE QUINNAT SALMON. 
103 
Table of data obtained from seining Pool B. 
Date. 
Num- 
ber of 
young 
salmon 
caught. 
N umber 
previ- 
ously 
marked 
in July. 
Time since 
J uly mark- 
ing. 
N umber 
of July- 
marked 
fishes 
taken. 
Number 
previ- 
ously 
marked in 
August. 
Time since 
last August- 
marked 
fishes were 
released. 
N umbel 1 of 
August- 
marked 
fishes 
taken. 
Estimated 
number 
of young 
salmon 
in pool. 
July 9 
177 
23 
167 
0 
25 
190 
6 
792 
22 
209 
5 
29 
209 
do" 
9 
15 
1 to 4 hours. 
1 
435 
Aug. 15 
IT 
209 
3T days 
4 
34 
1 day 
1 
5T8 
9 
209 
. do . 
0 
46 
(» 
29 
209 
....do 
6 
55 
do 
1 
1,595 
9 
209 
do 
1 
do 
1) 
Aug. 10. 
30 
209 
38 days 
9 
83 
1 day 
6 
415 
56 
209 
....do 
13 
98 
4 hours. .. 
9 
621 
11 
209 
do 
2 
132 
30 minutes - 
3 
616 
Aug. 18 
3 
209 
40 days . ... 
0 
141 
2 days 
1 
423 
685 
The chief value of this table is in the estimates given in the last column. The 
estimate of the number of young salmon in the pool ranges from 415 to 1,595. Half 
of the estimates come within 107 of the average, which is 685. This average is prob- 
ably not far from the actual number. 
Pool C is quite similar to Pool II, and was seined in much the same way. When 
two worked it, one had to hang the net on the rocks on one side, then swim across 
to the other side, when both pulled the seine off the rocks and hauled it inshore at 
the lower end of the pool. 
The following table gives a record for Pool C similar to that given for Pool B. 
In the only haul made in July, two of the four fishes taken had been marked. 
They had evidently come down from the pool above. Likewise in August four 
August-marked fishes were taken in the first haul, though none had yet been marked 
in this pool. In making the estimates of the number in the pool these four are 
considered, being added to the “number previously marked in August.” 
Table of seine hauls in Pool C. 
Date. 
Number 
of young 
salmon 
taken. 
Number 
previ- 
ously 
marked 
in July. 
Time 
since 
July 
marking. 
N umber 
of July- 
marked 
fishes 
caught. 
N umber 
previ- 
ously 
marked in 
August. 
Time since 
last mark- 
ing. 
Number of 
August- 
marked 
fishes 
caught. 
Estimated 
number in 
pool in 
August. 
4 
0 
2 
92 
;> 
3 
0 
4 
26 
2 
do'. . . 
2 
83 
2 hours 
2 
1,131 
39 
2 
....do... 
2 
105 
31 ) minutes . 
2 
1,908 
2 _ 
2 
do . . - 
0 
140 
....do 
1 
288 
August 16 
32 
2 
37 days. 
0 
141 
1 day 
5 
928 
III 
2 
do . . . 
0 
168 
30 minutes . 
5 
344 
August 18 
32 
2 
39 days. 
1 
173 
2 days 
10 
566 
861 
The data obtained from Pool C gives a larger estimate for the total number 
in the pool than that for Pool B (C, 861 ; B, 685). In the seven hauls of the seine in 
this pool in August there were 8 July-marked fishes secured. In the ten hauls in 
Pool B 49 were secured. From these two statements we determine that 18 per 
cent of the July-marked fishes of the two pools were in the lower pool in August. 
(8=7x10=11, 49+11 = 60, 1 l-r-60=. 18.) Only 1 per cent was released there, leaving- 
17 per cent to migrate. Some of these may have drifted over while faint from being 
confined in the net, but we think not many. We never saw any do so, though we 
often watched them for that purpose. It is safe to say that most of them went 
