44 THE AGE AND GROWTH OF SALMON AND TEOUT. 



The number of years and the quantity of fish which are included in 

 these statistics are so large, both for the Christiansand and for the Trondhjem 

 districts, that there is no room left for doubt that the difference which we 



1899 /MO 19M 



1903 190* 1905 1906 190T 1908 



FIG. 28. Annual Average Weights of Salmon (fish of three kilos and upwards) at 

 Christiansand, Moltuen (Trondhjems fjord), and Utvorden (Namseii) during 

 the years 1898 to 1908. 



find between these two districts must be regarded as a permanent charac- 

 teristic of the difference which is generally found between the catches in 

 these different localities. 



A yearly variation is noticeable both in the proportion of salmon to 

 grilse as well as in the average weight. 



