A STUDY ON TROUT AND YOUNG SALMON. 287 



VI (Kalstad October 24, 1898). Nearly all these were grown- 

 up fishes, belonging to older stages and in a state of sexual 

 maturity. 



Thus the upper reaches of the river were evidently devoid 

 of the younger group filling the mouth of the river: 



That this group afterwards must have ascended the river 

 in shoals, I was able to prove in May 1899. 



I then made a haul at Forve, where no fish had been ob- 

 tained in October. This haul yielded 175 trout represented in 

 the last column of table VI (Forve bridge, May 3 1899). These 

 fishes clearly belong to the same group which, during late 

 autumn 1898, ascended the river, and clearly they also constitute 

 the larger of the two groups which would emigrate from the 

 river during the same spring (compare table V, 1st column). 



By way of example, this fact is also clearly illustrated by 

 looking up the size of trout which in May occurs in the fiord. 

 The size of this trout is very well shown in table VII, column 1, 

 representing fishes caught in the Beitstadfiord, May 1900. 



I have also satisfied myself that this group does not occur 

 „en masse" in the Orkla during summer. Thus in July 1901 

 fishing right from Kalstad down to the mouth of the Orkla 

 brought nothing but quite young trout, and as mentioned, a few 

 quite young salmon. Only very rarely a larger trout would be 

 seen rising to the flies, and evidently the river was to all prac- 

 tical purposes devoid of larger trout. This fact was also corro- 

 borated by British sportsmen, who for 10 years had fished the 

 beats at Kalstad. They acknowledged it as a characteristic 

 peculiarity of the river, that sea-trout, excepting fry, during sum- 

 nier was extremely scarce. 



These facts are also characteristic of the Gula. This is 

 partly shown when the second and last columns of table V are 

 compared. In August 1898 we find the smallest emigrants of 

 spring grown up to 20 — 30 cm. length, and prepared to re-enter 

 the river. Also in August a group is found between 10 and 



