83 
The year 1903 was followed by the year-class of 1904, which 
in 1913 gave 50 per cent.* of the cod examined by the Norwegians. 
The same year-class for herrings was the mainstay of the Nor- 
wegian fishery for a number of years, and gave the large catches 
of 1907 on the east coast of Scotland. The activity of Atlantic 
waters in 1912 was followed by the year-classes of 1913 and 1914 
in our herring fisheries. It would appear that the year 1921 will 
be followed by a good year-class of 1922. [Fish from this year- 
class should make their appearance in our herring fisheries in 
1925. 
It is possible, however, that the comparative value of the 
fishery of 1925 may be influenced by the number of young fish 
which spawned in the spring of 1921, and by hydrographic con- 
ditions which may occur in 1924 and drive young herrings into 
the spring spawning shoals of 1925 before they enter the summer 
shoals. The latter would lower the summer catches, just as in 
1921 it intensified the failure of the fishery. 

*Hjort. Op. cit., page 159. 
