"NATURAL HISTORY OF THE QTTINNAT SALMON". 
101 
in tlie pools, which were the only places that could be seined. Seven of these pools 
were seined frequently, and for convenience in keeping notes we numbered them 
A, B, C, D, E, F, and G, beginning with the upper. 
In July and August all specimens taken in Hazel Creek and in the river near 
by were marked by cutting oft the adipose fin with a pair of small curved scissors. 
This enabled us to know when we were taking specimens that had been taken before. 
Upstream movement . — The following is a record of the seining in Hazel Creek. 
The data for each seine haul consists of the date, the pool where it was made, the 
number of fry previously marked in lliis pool, number of days since the last were 
marked, total number taken, and number of marked lislies taken. 
Record of seine hauls in Hazel Creek. 
Date. 
Pool. 
Previ- 
ously 
marked. 
Days 
since last 
marking. 
Total 
catch . 
Catch of 
marked 
fish. 
Date. 
Pool. 
Previ- 
ously 
marked. 
Days 
since last 
marking. 
Total 
catch. 
Catch of 
marked 
fish. 
May 17. 
14 
Sept. 18.. 
Lower . 
104 
32 
52 
39 
20 
Upper.. 
107 
32 
40 
30 
July {) 
do _ . - 
55 
Oct. 18. . . 
Lower . 
104 
62 
125 
87 
Aug. 17. 
....do... 
48 
39 
49 
12 
Upper. . 
107 
62 
94 
48 
....do... 
48 
39 
45 
5 
Nov. 18. _ 
Lower . 
104 
93 
93 
22 
do 
48 
39 
30 
2 
Upper. . 
107 
93 
113 
54 
Upper. . 
0 
78 
i 
Dec. 18.. 
Lower 
104 
123 
4 
1 
1 
Upper. 
107 
123 
II 
0 
do... 
37 
0 
It will be seen from the table that in seining the lower pool in August, 1!) young 
salmon were obtained that had been marked in July. As there had been but 48 
marked in this pool in July, it indicates that at least 40 per cent of the fishes that 
were in this pool July 9 remained until August 17. 
In the upper pool we found two July-marked fishes in August, where none had 
been marked in July. As the lower pool is about 100 yards from the upper, this 
indicates that at least 4 per cent of the fishes in the lower pool had ascended the 
stream that distance. 
There were 104 specimens marked in the lower pool during July and August; 
39, or 38 per cent of these, were found there in September; 36, or 35 per cent of the 
107 marked in the upper pool in August, were found in September. Only one haul 
of the seine was made in each place in September. 
In August four-sevenths of the marked fishes found in the lower pool were taken 
in the first haul of the seine. (When more than one haul was made the marked fishes 
taken were held till the seining was over, in order that they might not be counted 
twice.) Assuming that the same proportion was taken in the one haul in September, 
we would reason that there were 68 marked salmon in the lower pool that month; 68 
would be 65 per cent of the number marked — that is, 65 per cent of the fishes in Hazel 
Creek on August 17 remained until September 18. This approximates the estimates 
made for the pools in the river below the mouth of Hazel Creek. (See notes below.) 
In a similar way, 36 per cent of the 104 marked in the lower pool were found in 
one haul in October, and 45 per cent of the 107 marked in the upper pool. Thus 
there was a loss of 2 per cent over the previous month in the lower pool, and a gain 
of 10 per cent in the upper, indicating an upward movement. 
But the upward movement is indicated better by the simple statement of num- 
bers, as given in the table. In September there were 39 marked fishes taken in the 
lower pool to 36 in the upper; in October the ratio was 37 to 48, and in November it 
was 22 to 54. It is difficult to see how this can mean anything else than that the 
