378 KNUT DAHL. 



I employed the smallest trout flies obtainable or minute 

 Japanese flies without a barb. 



In all these localities the young of the salmon abounded. 

 High up the river they appeared to be most numerous. Shoals 

 of them could here be seen everywhere swarming in all pools 

 and rapids, especially the large quiet and relatively shallow 

 pools. Throwing my small flies along the shore and dragging 

 them towards me, shoals of young salmon as well as trout were 

 enticed to come so close that the two species, even in the water, 

 were clearly distinguished. The young salmon however by far 

 outnumbered the young trout. Each cast made dozens of fishes 

 rise to the flies, which however only the largest ones were able 

 to swallow. 



The fishes denoted in the last column of Tab. No. IV re- 

 present the sizes caught on my flies at Kalstad. As it will be 

 observed, they are a good deal smaller than the young, emigrat- 

 ing in spring from the Orkla (vide first column of same table). 

 However, there were in the river considerably smaller fishes 

 which I could not catch with the fly. 



Not one single young salmon in the silvery coat of emi- 

 gration was here observed, a fact also stated by the British 

 sportsmen fishing the river. They said that „The parr did not 

 become smolts". All the young observed by me in this locality 

 had the coating and colours peculiar to the salmon before acquir- 

 ing the emigration coat, viz: a greenish-yellow a little copper- 

 hued and faintly iridescent colouring, forming as it were a 

 coating over the other characteristic pigment markings and 

 spots. 



At Aarhvold (20 km. lower down), the same phenomenon as 

 above mentioned was observed. However a few young of a 

 slightly larger size and in emigration colouring, were observed. 



At Bak midway between Aarlivold and the mouth of the 

 river, young salmon in the emigration garb were the only 

 ones found. These young, the size of which may be seen in 



