Fishery bulletin of the Fish and Wildlife Service - NOAA

284 SALMON OF THE KARLUK RIVER, ALASKA
1'
Age of seaward migrants
marked
•> ...
3_.
4
i
Total
Calculated
number of
each age
marked
21,853
23,041
162
50,061
TABLE 33.—Data for the 1929 marking experiment
Age of ush
returning
from 1929
migration
í 3i
4i
4j
63
4>
4s
61
7,
í
1 64
1 7,
7í
Calculated
number of
each age
group examined
57
2,734
212
100, 8«
*• IS
679
96,883
3, 110
176
215, 269
Number of
marked fish
of each age
group found
3
366
5
826
613
1,315
Percentage
occurrence
of marked
fish in fish
examined
1.415
.363
.736
.853
1.961
1.705
EXPERIMENTS IN 1930
Calculated
number of
fish of each
age group
returning
311
18,573
46, 344
703, 031
752
136, 159
628,663
39,920
1,308
1, 760, 325
Calculated
number of
marked fish
returning
656
Я 882
1,002
5,362
783
22
11, 157
Percentage
return
Total per-
at various
centage
ages
return
3.0
12.2
3.5'
19.1
2.8
13.5
\ 18.3
j
| 25. 4
Three marking experiments were carried on simultaneously (tables 34-36).
Although the experiments were simultaneous they have been designated first, second,
and third for reference purposes and to provide for facility in discussion.
In the first experiment (table 34), 25,000 seaward migrants were marked by amputation
of the adipose and right ventral fins, 631 of these were recovered, and a calculated
total of 5,177 fish returned (20.7 percent).
In the second experiment (table 35), 25,000 seaward migrants were marked by
amputation of the adipose and left ventral fins, 666 of these were recovered, and a
calculated total of 5,350 marked fish returned (21.4 percent). Two marked fish of the
7 8 age group were recovered, but according to the data, no fish of that age group were
examined or were present in the return from the migration. The 7 3 age group, undoubtedly,
was present among the fish examined, but its numbers were so few that
representation was not afforded in the samples from which scales were secured for
age determination.
1
3
4
6
Age of seaward migrants
marked
Total
Calculated
number of
each age
marked
.
14,676
9,773
TABLE 34.—Data for the first 1930 marking experiment
299
25,000
Age of fish
returning
from 1930
migration
4i
4j
61
4>
5>
61
5|
61
74
i 7 1
1 7«
Calculated
number of
each age
group examined
130
2.078
3,212
1,252
67, 451
32,251
8,669
72, 392
1,769
325
1,146
190, 675
Number of
marked fish
of each age
group found
1
4
163
87
26
322
1918
631
Percentage
occurrence
of marked
fish in fish
examined
0.031
.319
.242
.270
.300
.445
1.058
.308
.698
Calculated
number of
flsh of each
age group
returning
804
18,664
38,624
8,764
714, 745
268,334
48,829
502, 844
21,838
1,507
8,835
1, 633, 788
Calculated
number of
marked fish
returning
12
28
1,730
725
146
2,238
231 5
62
6 177
Percentage
return
at various
ages
4.8
.2
11.8
4.9
l.S
22.0
2.4
1.7
20.7
13.5
Total percentage
return
1
)
. 0
*•*
\
1
16.0
1 26.8
I
\ 22 4
/