ON TROUT. 



57 



market in Norway are always about 20 cm. to 40 cm, in length, as can be 

 verified by examining all the measurements made in this country. 



In order to form an idea as to how the general stock in the Trondhj em- 

 fjord compares with the examples taken from the catches of the fishermen 

 referred to in Table XVII. , I have made the following summary of my catches 

 in that district during the years 18981900, which was published in 

 tabular form in 0rret og Unglaks. 



The summary indicates that the larger and older sea trout occur in 

 relatively small numbers, and that the figures given in Table XVII., rather 

 over-estimate than under-estimate the frequency of the larger and older fish. 



Interesting information with regard to growth is also given in our 

 summary on page 56, and more especially as regards the figures for 

 length and weight of fish which had completed one and two winters after 

 migration. These figures are based on so large a number of observations 

 that they may be accepted without reserve. The values for fislj that had 

 lived three and four winters after migration may be less convincing, but 

 they give a tolerably sound indication of the rate of growth. 



As regards the growth of sea trout in other parts of the country, I 

 have as yet but little information, and it is quite possible that the growth 

 may differ to some extent in different localities. 



The only place from whichlhave any material which admits of comparison 

 is Utskarpen in Ranenf jord (see Table XIX.) and comparing the figures we get : 



Average Length in cm. of Fish which after Migration had Lived 



