(28 4 ) 



3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 



Ifllll 



1907 



■ ■*■ 



1908 



I 



1909 



1 



1910 



J 



1911 



1 



1912 



I 



1913 



1 



1914 



M^^— 



A 



1915 





A 



1916 



JLL 



1 



1917 



Id 



1 



1918 



II - .1 1919 



: 20 



20 



40 

 20 



: 60 



40 



20 



60 

 40 

 20 



60 ^ 

 40 £ 



60 <* 

 40 ^ 



Z0 3 



-40 ^ 



: 20 



40 



-120 



: 20 



■20 



Fig. i 



3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 

 Age of fish -years 



69. Age composition of Norwegian herring catches 1907-19, showing 

 the preponderance of particular year-classes. (After Hjort.) 



