106 
BULLETIN OF THE UNITED STATES FISH COMMISSION. 
The following shows the measurements of young salmon taken in the Sacramento 
in J uly, 1898. Bold-faced type indicates where the average sizes fall. For Dunsmuir, 
Redding, and Battle Creek the numbers given indicate the total number of fish taken. 
None were taken below the latter point. All were taken between July 9 and 13. 
Table showing size of young salmon taken during July, 1S9S. 
Number of specimens. 
N umber of specimens. 
Size. 
Duus- 
rnuir. 
Sims. 
Hazel 
Creek. 
Red- 
ding. 
Battle 
Creek. 
Size. 
Duns- 
muir. 
Sims. 
Hazel 
Creek 
Red- 
ding. 
Battle 
Creek. 
1 
3 inches 
1 
1 
1 
3.J inches 
1 
O 
1 
1 
3.2 inches 
1 
1 
3.3 inches . . . 
1 
1 
3.5 inches _ __ 
1 
1 
2 
1 
3 
1 
1 
1 
1 
3.7 inches . . . 
i 
1 
1 
i 
o 
3.9 inches _ 
1 
i 
1 
0 
4.3 inches . 
1 
Note that the average sizes in the above table are from 2.8 inches in Hazel Creek 
to 3.1 inches at Redding. In comparing this table with that for the month of May 
(see above), it will be seen that the average size increased from 2.4 inches in May to 
3 inches in July, an increase of 0.6 inch in two months. This is also the amount 
of increase if only the smallest specimens in Hazel Creek are considered. They 
increased from 1.5 inches in May to 2.1 inches in July. This is an increase of 0.3 
inch per month for fishes averaging under 3 inches in length. Each table shows 
that there was a greater variation at the upper stations. 
The growth of 0.3 inch per month is also shown bj T the following table of meas- 
urements of specimens taken at Sisson in May and August. The average sizes are 
indicated by heavy-faced type. In computing the average for May, the four largest 
fish are not counted, as they evidently belonged to the summer run of adults instead 
of the fall. Measurements of specimens taken in the river at the mouth of the creek 
in August ai'e given for comparison with those from the creek. The average size 
in May was 2.2 inches; in August, a little over three months later, it was 3.3 inches, 
the increase in size of those remaining in the creek being one-third inch per month. 
The growth was probably a little greater than that, the larger specimens migrating. 
Table showing increa.se in size of young salmon at Sisson. 
Number of specimens. 
Number of specimens. 
Size. 
Sulla way Creek. 
River, 
Aug. 19. 
Size. 
Sulla way Creek. 
River, 
Aug. 19. 
May 15. 
Aug. 19 
and 25. 
May 15. 
Aug. 19 
and 25 
1.6 inches 
2 
2.9 inches „ _ 
i 
2 
1 
1.7 inches 
2 
3 inches 
1.8 inches . _ 
5 
2 
3.1 inches 
2 
4 
3.2 inches 
1 
4 
2 
3 3 inches . _ . 
1 
5 
2.1 inches 
1 
3.4 inches 
2 
2 
2.2 inches 
o 
3 5 inches 
1 
1 
2.3 inches 
4 
3.6 inches 
2 
3 
2 4 inches 
2 
I 
2 
2.5 inches 
3.8 inches 
3 
1 
2 6 inches 
3 
1 
2 
1 
A 
1 
3 
3 
1 
The above shows the amount of variation in the young salmon of approximately 
the same age. All were released from the Sisson hatchery. The oldest were hatched 
