40 THE AGE AND GKOWTH OF SALMON AND TEOUT. 



Let us now consider : 



(c.) The Salmon's Growth after Migration. 



Tables III. to XIII. contain all the information which our investigations 

 are able to give concerning this question. If we examine the different tables 

 we find that the individual fish which belong to each year's class vary very 

 much in size within certain limits. At the same time these variations 

 arrange themselves in more or less regular Galton curves. 



In order to obtain a useful illustration of the growth which each single 

 age-class has made, we must turn our attention to the average sizes, which 

 have been calculated for each age-group, both as regards length and weight. 



By means of these averages I have compiled the following tables of the 

 results of my analysis for the years 1908 and 1909. 



The tables contain the average length and weight which I have found in 

 my analysis of salmon which had lived one, two, or three winters subsequent 

 to migration. Maiden fish and those with spawning marks are treated 

 separately. In a separate column for each year's class I give the number 

 of fish on which the averages are based. Everyone can therefore judge for 

 himself how much reliance should be placed on them. 



I have omitted from the tables fish of more than three winters after 

 migration, as their number is so small that an average based on so small 

 an amount of material would have but little value. 



MAIDEN FISH. 



