— 201 — 
K. Dahl’s investigations as to the fluctuations in the salmon fisheries. 
A parallel to the investigations here referred to is furnished by a recently published 
article of K. Dauı*) concerning the fluctuations in quality of the salmon. In the salmon 
fishery, distinction is made between “small salmon” (under 3 kilos) and “large salmon”, 
often merely called “salmon”, (over 3 kilos). The weight of the large salmon varies 
so greatly that the yield in one year (in Trondelagen) may show an average weight of 
9 kilos, and in the following only 6 kilos. These fluctuations, which have been regarded 
/0,000 Agr. 
Mgr. Wop 
85 
// 8. = 
oO fo) TT eT EE | 
st Er — — 
7 é t—_t+~—_+_ + 
= => 
io eS SR 
90 
80 5 
4 
70 
4898 1599 1900 1901 1902 1903 190% )905 1906 307° 7908 
Fig. 126. Average weight of ‘“salmon’” 1898— 1908. 
---- at Kristianssand. at Moltuen (Trondhjemsfjord). —:— at Utvorden (Namsen Fjord). 
Total yield of Norwegian salmon fisheries 1898—1908 (Scale to the left). 
as variations in the “quality” of the salmon, are so great as to seem almost sufficient 
in themselves to explain the fluctuations in the total quantity of the yield. This will 
be seen from Fig. 126, taken from DauL’s article. It will be noticed that there is a certain 
similarity discernible between the fluctuations in the yield of the salmon fishery and 
the variations in average weight of the large salmon above referred to. 
By means of age determinations of large samples taken at different parts of the 
coast, DARL has however, succeeded in demonstrating that the fluctuations in the average 
*) Aarlige Vekslinger i Laksens kvalitet, deres aarsager og virkninger, Norsk Fiskeritidende, 
November 1913. Some Salmon Studies, Salmon and Trout Magazine, London 1913. 
26 
