68 
BULLETIN OF THE BUREAU OP FISHERIES 
Comparison with the data from the Colimibia River and from Monterey shows 
that the average lengths of the various age groups, as found near Fort Bragg and 
Drakes Bay, is substantially in agreement with the data from other sources, although, 
as at Monterey, the fish are somewhat longer than Columbia River fish of the same 
age groups. The data are too few, however, to give accurate results. 
Table 27 (p. 88) and Figure 25 give the egg sizes found in these collections. 
Sixty-four females are available, and the table shows that they are divided, on 
the basis of the sizd of the eggs, into three well-marked groups — the group with 
the largest eggs destined to mature during the year in which they were captured 
and the others composed of immature individuals. Sixty-seven per cent were 
mature; This is a somewhat smaller percentage of mature fish than was foimd 
off the mouth of the Columbia River at the same time of year. Since most of the 
individuals contained in this collection from the northern coast of California were 
taken in Drakes Bay, August 15 and 16, the comparison has been made with the 
Columbia River fish taken, August 15. Reference to Figure 11 shows that on this 
Ta/(en at Drakes Bay 
and Fort Brogy 
/9/a- 
1 
1. 1. 
1 
-l-^ao -I.VO O.OO 0.10 0.20 0.30 0.40 0.50 0.60 0.70 
L06ARITM OF Diameter or Eggs 
Actual DiA/^ETCft or Eggs mm. 
0,63 0,7S 1.0 I.ZS 1,5 I.7S 20 !.5 3.0 3.S -10 4.5 S.O SIS 
Fig. 25. — Distribution of egg sizes as found in a collection from Fort Bragg and Drakes Bay, 
Calif. 
date (the one hundred and seventh day of the season) about 87 per cent of the 
fish taken near the mouth of the Colimabia were mature. The discrepancy can 
hardly be considered as significant, however, on accoimt of the inadequate number 
of data from Drakes Bay and Fort Bragg. 
Since the egg samples were accompanied by data giving the length of the fish 
from which they were taken, and presumably, in the main, came from the same 
individuals from which scale samples were taken, an attempt has been made to 
determine which age groups were represented among the immature fish. A table 
has been prepared (Table 15) showing the correlation between length of fish and 
size of eggs, and also the range in the size of the fish composing the three groups 
distinguished by egg size. For the sake of comparison there is shown, in the same 
table, the range in size of the females found in the various age groups. From tliis 
table it is apparent that the fish with the smallest eggs were all in their second 
year. They were all between 40 and 50 cm. in length, and the only individuals of 
this size represented in the collection of scales were 2-year fish. The second group 
of fish (those with log D between 0.00 and 0.30) agree in length with those in their 
third year. There are 18 individuals in group 2, and in the scale collection 19 
females were 3-year fish. The agreement between the two categories makes it 
seem practically certain that group 2 is composed largely, if not entirely, of fish 
