— 162 — 
(this will be dealt with in the following chapter). The curves embrace the years from 
1866 or 1880 to 1913. 
On examining these curves, it is immediately evident that we have here a task of 
considerable difficulty ; it will at once be seen that they can only be satisfactorily under- 
200 4 
1868 70 72 74 76 76 80 62 84 86 88 90 92 94 96 98 190002 04 06 08 10 1213 
3 
1866 68 70 72 74 76 78 80 82 84 86 AB 90 92 94 06 O8 1900 02 04 06 08 10 1215 
Fig. 100. A. Yield, in thousands of hectolitres, of the Norwegian herring fisheries 
during the years 1866—1913. 
2. Spring herring fishery, 
1. ---- fat herring fishery. 
B. Yield of the cod fisheries, in millions of fish, for the years 1866—1913. 
1. Skrei fishery, 
3. Finmark fishery, 
2 Showing the fluctuations in the quantity of liver (cf. Chap. V, Fig. 106). 
stood when supplemented by an extensive material m the form of observations as 
to age and size. Thus the later years are easily understood. The herring fishery exhibits 
rich yield of fat herring at the time when the 1904 year class was 3, 4 and 5 years old, 
as also of spring herring when the same fish were 6—9 years old, (1910—1913). Simi- 
larly, we note an increase in the yield of Fmmark fish in 1909—1912, when the 1903 and 
1904 year classes commenced to make themselves increasingly apparent in the line 
hauls there, while the skrei yield shows high figures for 1911 and 1912. On the other 
