= OR — 
25 26 27 28 29 30 31 32 33 34 35 composition in point of age of the spring 
herring for each of the years from 1907—1913. 
It will be seen that spring herring are found 
from 3 to 18 years of age; those between 4 
and 10 years old are, however, the only 
ones present in any considerable numbers 
(over 17 %). 
Age of Norwegian Spring Herring 
in the years 1907—1913. 
The representation of each year class is given 
in percentages. 
| 
Bee WS | 2) 86 où 89 ro) a 
1907... 16 222 185 148126194 34| 23| 17 
1908... …. Bes 12.2116 111] 85 144| 1.9] 11 
1909... .. \oslerzlııa| 41] 48| 67176) 33 
TON .. | 12| 9978| 67| 10) 04 1.1] 20 
DON, as … | 06) 4.1/17.3 200] 55 1.5| 0.6) 05 
1912...../.. |16| 31| 391145 643 | 64| 1.6) 12 
1913... 01|07|22|34| 48133 647 5.1) 12 
Year 
des [1218/14/16 | 16 |17 | 18 | 19 | 20 
1907... 2221100) lo: 5. on | 2. || co | ce | a 
1908... 15115) 08) 08) ai) on) | à |. 
1909... 26| 1.6] 2,3| 04 02| 04| 02 
1910... le le: 
TON ne a ARE ER A 
UID... 12| 1.5] 06] 01] .. | 01 
ITB, + 12| 05| 02] 02| .. 
The figures in the table will be found 
graphically represented in Fig. 16, which shows 
very clearly how this rich year class (here 
indicated by the strongly marked summit of 
the curve) gradually increases in age from 
1908, when it was four years old, to 1913, 
when it was nine. All the other year classes 
must have been, at least comparatively, far 
poorer in these years. There is, however, 
one exception. It will be seen from the table, 
25 26 27 28 29 30 31 32 33 34 35 that in 1907 the number of eight year old 
Fig. 15. Compas tonal point of size ofspring fish (year class 1899) was 19.4 %: this year 
erring. 
— whole sample. ==. 1904 year class. pgclass is represented in 1908 and 1909 by 
