1 6 bulletin of the bureau of fisheries 
A scale taken from a migrating yearling (pi. xi, fig. 19) is entirely similar to those 
of the stream type in the case of the sockeye and king salmon. A few widely spaced 
rings in the center, representing the late spring or early summer growth of the fry, are 
followed by closely crowded rings of fall and winter. The outermost of these are often 
very slender and broken. The number of rings formed during the first year varies 
widely, perhaps from 10 to 25, the larger number being found in general in individuals of 
larger growth. In many migrating yearlings the more rapid growth of the new year 
is apparent around the edge of the winter band (pi. xi, fig. 19), but the rings thus 
formed in the stream are not nearly so wide as those formed during the same season 
after reaching the sea. There is thus, surrounding the first year’s growth, often an 
intermediate zone which, together with the surrounding band of very widely spaced 
rings, represents the second summer’s growth. (PI., xi, fig. 20.) The outer rings of 
the intermediate zone may even be narrowed, as though a check to growth was expe- 
rienced at the migrating period. Such an intermediate zone is by no means of universal 
occurrence. 
The further fate of the stream type yearlings is well shown in a series secured in 
Puget Sound in the month of August, 1910 (pi. xi, fig. 20). These range in size from 
6 to 14 inches and wholly parallel the series of yearling king salmon of stream type, 9X 
to 1 1 ^ inches, with which they were found associated. As they were taken with purse 
seine in the open sound, the greater number of individuals were sexually undeveloped, 
but a few males were developed precociously. The precocious males later join the 
spawning run and have been found associated with it. 
We are unable to give any satisfactory account of the fry which run to sea soon 
after hatching. Chamberlain has reported these in Alaska waters as more numerous 
than those which descend as yearlings. By analogy we should expect the same to be 
the case in Puget Sound and California. But neither among the yearlings of Puget 
Sound nor the adults of this and other regions do we find scales of the sea type in any 
considerable numbers. Three alternatives seem to confront us. Either (i) the young 
do not proceed to sea as fry in the southern part of the range of the species, or (2) the 
fry do not survive in salt water, or (3) unlike the sockeye and king salmon there is no 
difference in growth during the first year between those which proceed to sea and those 
which remain in the streams. As bearing on this last point it must be stated that a 
very few individuals of undoubted sea type have been examined. The matter is one 
in need of complete investigation. We are of the opinion that the spawning run in 
Puget Sound and in California is composed of those individuals which spent their first 
year in the streams, with exceptions so few as to possess no practical significance. 
The spawning run has been examined by us in numerous individuals covering the 
range in size from 1 7 to 30^ inches. All of these have been fish in their third year, the 
scale being shown in plate xri, figure 21. The closely crowded nuclear area represents 
here as elsewhere the first year and a half spent in fresh water. Outside this are seen 
the parts representative of the life spent in the sea, consisting of the bands of the sec- 
ond summer, the third winter, and the third summer. Barger specimens should be 
