an accurate view of the stock of skrei in a more restrieted area; in the case ol 
more extended regions, however, the composition in point of size may — in 
any case in some years — exhibit considerable variations. It is evident that it 
will be necessary in the future to investigate the stock of skrei at different lo- 
calities in order to ascertain how the size varies from one place to another; only 
by means of such investigations, pursued throughout a considerable period of time, 
will it be possible to determine with any great degree of accuracy, the size of the 
stock in separate years. Until this has been done, all observations will of necessity 
d9- 65- 75 85- 95- 1057 
59 69 79 89 99 109 
Fig. 58. Composition in point of size of 3 samples of skrei from Rast, 
measured during the skrei season in 1913. 
be of a provisional character, and limited value. It is however, a point of great interest 
to examine how great.the differences have been between the various years, according 
to the material at present available. I have therefore shown, in the table on p. 92 and 
in Fig. 61, the results of all the measurements, taking all the samples for each separate 
year as one. Finally, the table also shows the averages for all samples, referred to above, 
(see last line, and Fig. 55). A comparison of the different years reveals great differences 
in several respects. The average size for all fish measured was, in 1903, 71.8cm., as against 
81.1 in 1907. The fact that the difference in the average sizes (for all samples) for two 
separate years can amount to between 9 and 10 cm. is of the utmost importance, when 
