MIGRATION OF SALMON IN COLUMBIA RIVER. 
141 
Table I. — Distribution, Time, and other Facts Concerning the 17 Salmon and Steelheads 
Retaken Out of the 59 Marked and Liberated at the Washington State Trap, Columbia 
River, August 14, 1908 — Continued. 
Species, number, 
and sex. 
Distance 
from 
state trap. 
How taken. 
By whom taken or reported. 
CHINOOK. 
8ocf 
Miles. 
IS 
0 
Millers Sands Fishing Co., reported by Wm. B. Bailey. 
W. N. Futrup. 
I 09 cf 
Trap 
a 4 
IS 
Sunderland’s trap, reported by H. C McAllister. 
SILVER. 
75 c? 
Do. 
87? 
70 
89/ 
Seufert Brothers Company. 
210 
Do. 
STEELHEAD. 
98 
Seufert Brothers Company. 
Pillar Rock Packing Company. 
Seufert Brothers Company. 
70 
% 
?.: 
Trap 
B. Soderlund. 
a Downstream. 
The fact that aluminum is corroded by immersion in salt water has in a degree 
served to indicate the career of the marked fish after they were turned back into the 
Columbia. The degree of corrosion does not enable one to distinguish as between a 
relatively short time in concentrated salt water and a longer time in relatively dilute 
brackish water, but where corrosion occurs extensively in a short period of time, as in 
fish number 80, which was out only 11 days, it is pretty safe to assume that the fish 
spent most of the time in relatively concentrated sea water. Tables and figures are 
presented below for the purpose of showing the degree of corrosion of the marking 
buttons. An examination of these tables and figures will show that each group of 
fishes of the three species liberated had certain individuals that had gone into sea water 
long enough to produce corrosion of the marking buttons. 
Table II. — Marked Chinook Salmon Retaken, Showing the Extent of Corrosion of the 
Marking Buttons by Sojourn in Salt Water. 
Number. 
Time out 
in days. 
Distance 
from 
state 
trap. 
Corrosion of marking button. 
“U. S. Fish” surface. 
Numbered surface. 
Miles. 
80^ 
1 1 
15 
Very light corrosion in groove around 
Corrosion over four-fifths of raised rim of 
head of rivet. 
shaft and around rivet. 
T r«n ,-f 
Smooth. 
t t n T 1 
Do. 
6 
a 4 
Do. 
Do. 
123c? 
31 
15 
Blackened and slight corrosion around 
Deeply etched about rivet where it emerges 
head of rivet. 
from shaft, and on inner margin of 
shaft. 
a Downstream. 
